This is our initial public offering of our common stock. We are selling 16,900,000 shares of our common stock.

We have granted the underwriters an option to purchase up to 2,535,000 additional shares of common stock to cover over-allotments.

Our common stock has been authorized for listing on the New York Stock Exchange, subject to notice of official issuance, under the symbol “COR.”

We intend to elect to be taxed and to operate in a manner that will allow us to qualify as a real estate investment trust, or REIT, for U.S. federal income tax purposes commencing with our tax year ending December 31, 2010. Shares of our common stock are subject to ownership limitations that are intended to assist us in qualifying and maintaining our qualification as a REIT, including, subject to certain exceptions, a 9.8% ownership limit. See “Description of Securities.”

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The underwriters expect to deliver the shares to purchasers on or about September 22, 2010 through the book-entry facilities of The Depository Trust Company.

You should rely only on the information contained in this prospectus. We have not authorized anyone to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. You should not assume that the information in this prospectus is accurate as of any date other than the date on the front cover of this prospectus.

This prospectus contains third-party estimates and data regarding growth in the Internet and data center industries. This data was obtained from reports by and publications of Tier1 Research, LLC, Cisco Systems, Inc., Nemertes Research and Gartner, Inc. Although we have not independently verified the data and estimates contained in these reports and publications, we believe that this information is reliable. However, there can be no guarantee that the markets discussed in these reports will grow at the estimated rates or at all, and actual results may differ from the projections and estimates contained in these reports. Any failure of the markets to grow at projected rates could have an adverse impact on our business. See “Appendix B: Citations” for a complete list of these reports and publications.

Investment in our common stock involves risks. In addition to other information contained in this prospectus, you should carefully consider the following risk factors before acquiring shares of our common stock offered by this prospectus. The occurrence of any of the following risks might cause you to lose all or a part of your investment. Some statements in this prospectus, including statements in the following risk factors, constitute forward looking statements. Please refer to the section entitled “Forward-Looking Statements.”

Our portfolio of properties consists primarily of data centers geographically concentrated in Los Angeles, the San Francisco Bay and Northern Virginia areas, Chicago, Boston, New York City and Miami. These markets comprised 36.7%, 31.5%, 12.5%, 7.0%, 6.4%, 4.4% and 1.5%, respectively, of our annualized rent as of June 30, 2010. As such, we are susceptible to local economic conditions and the supply of and demand for data center space in these markets. If there is a downturn in the economy or an oversupply of or decrease in demand for data centers in these markets, our business could be materially adversely affected to a greater extent than if we owned a real estate portfolio that was more diversified in terms of both geography and industry focus.

For fiscal years 2008 and 2009, our Predecessor on a consolidated and combined basis had net losses of $13.9 million and $7.0 million, respectively. For the six months ended June 30, 2010 our Predecessor had a net income of less than $0.1 million. For the last three fiscal years, the Acquired Properties on a combined basis were only profitable during the six months ended June 30, 2010 and 2009 and for the year ended December 31, 2009, with net income of $4.8 million, $2.7 million and $4.9 million, respectively, and net losses of $7.4 million and $3.7 million for years ended December 31, 2008 and 2007, respectively. On a pro forma condensed consolidated basis, our Predecessor and the Acquired Properties collectively had net loss of $18.0 million and less than $0.1 million, respectively for the year ended December 31, 2009 and the six months ended June 30, 2010, respectively. Our ability to achieve profitability is dependent upon a number of risks and uncertainties, many of which are beyond our control. We cannot assure you that we will be successful in executing our business strategy and become profitable and our failure to do so could have a material adverse effect on the price of our common stock and our ability to satisfy our obligations, including making payments on our indebtedness. Even if we achieve profitability, given the competitive nature of the industry in which we operate, we may not be able to sustain or increase profitability on a quarterly or annual basis.

We compete with numerous developers, owners and operators of technology-related real estate and data centers, many of which own properties similar to ours in the same markets, including Digital Realty Trust, Inc., Dupont Fabros Technology, Inc., 365 Main Inc., Equinix, Inc., Terremark Worldwide, Inc., Savvis, Inc. and Telx Group, Inc. In addition, we may face competition from new entrants into the data center market. Some of our competitors have significant advantages over us, including greater name recognition, longer operating histories, lower operating costs, pre-existing relationships with current or potential customers, greater financial, marketing and other resources, and access to less expensive power. These advantages could allow our competitors to respond more quickly to strategic opportunities or changes in our industries or markets. If our competitors offer data center space that our existing or potential customers perceive to be superior to ours based on numerous factors, including power, security considerations, location or network connectivity, or if they offer rental rates below our or current market rates, we may lose existing or potential customers, incur costs to improve our properties or be forced reduce our rental rates. This risk is compounded by the fact that a significant percentage of our customer leases expire every year. For example, as of June 30, 2010, leases

We depend on the efforts of key personnel, particularly Mr. Thomas M. Ray, our President and Chief Executive Officer, and Ms. Deedee Beckman, our Chief Financial Officer. Our reputation and relationships with existing and potential customers, industry personnel and key lenders are the direct result of a significant investment of time and effort by our key personnel to build credibility in a highly specialized industry. Many of our senior executives have extensive experience and strong reputations in the real estate and technology industries, which aid us in capitalizing on strategic opportunities and negotiating with customers. Our Chief Financial Officer, Ms. Deedee Beckman, has indicated to us that for personal reasons she would like to reduce her service to our company to a part-time basis at a reasonable and mutually convenient time. At such future time, Ms. Beckman would voluntarily resign from her position as our Chief Financial Officer. No date has been set for her transition from her current position as Chief Financial Officer, although we have commenced a search to identify a qualified candidate to succeed her in that capacity. Ms. Beckman will continue to serve as our Chief Financial Officer until we find a suitable replacement and, thereafter, for a period of time to assist in the transition process. We and Ms. Beckman have also expressed a mutual desire for her to continue as a permanent part-time employee following this transition. While we believe that we will be able to find suitable replacements for Ms. Beckman and any other key personnel who may depart from time to time, the loss of their services could diminish our business and investment opportunities and our customer, industry and lender relationships, which could have a material adverse effect on our operations.

In addition, our success depends, to a significant degree, on being able to employ and retain personnel who have the expertise required to successfully acquire, develop and operate high-quality data centers. Personnel with these skill sets are in limited supply and in great demand and competition for such expertise is intense. We cannot assure you that we will be able to hire and retain a sufficient number of qualified employees at reasonable compensation levels to support our growth and maintain the high level of quality service our customers expect, and any failure to do so could have a material adverse effect on our business.

As part of our growth strategy, we intend to commit substantial operational and financial resources to develop new data centers and expand existing ones. However, we typically do not require pre-leasing commitments from customers before we develop or expand a data center, and we may not have sufficient customer demand to support the new data center space when completed. A lack of customer demand for data center space or excess capacity in the data center market could impair our ability to achieve our expected rate of return on our investment, which could have a material adverse effect on our financial condition, operating results and the market price of our common stock.

Our business depends on providing customers with highly reliable service. We may fail to provide such service as a result of numerous factors, including:

Problems at one or more of our data centers, whether or not within our control, could result in service interruptions or equipment damage. We provide service level commitments to substantially all of our customers. As a result, service interruptions or equipment damage in our data centers could result in credits to these customers. In addition, although we have given such credits to our customers in the past, we cannot assure you that our customers will accept these credits as compensation in the future. Service interruptions and equipment failures may also expose us to additional legal liability and damage our brand image and reputation. Significant or frequent service interruptions could cause our customers to terminate or not renew their leases. In addition, we may be unable to attract new customers if we have a reputation for significant or frequent service disruptions in our data centers.

Our properties have access to a finite amount of power, which limits the extent to which we can lease additional space for use at our data centers. As current and future customers increase their power footprint in our facilities over time, the remaining available power for future customers could limit our ability to increase occupancy rates or network density within our existing facilities.

Furthermore, at certain of our data centers, our aggregate maximum contractual obligation to provide power and cooling to our customers may exceed the physical capacity at such data centers if customers were to quickly increase their demand for power and cooling. If we are not able to increase the available power and/or cooling or move the customer to another location within our data centers with sufficient power and cooling to meet such demand, we could lose the customer as well as have liability under our leases. Any such material loss of customers or material liability could adversely affect our results of operations.

In order to maintain our qualification as a REIT, we are required under the Code to distribute at least 90% of our net taxable income annually, determined without regard to the dividends paid deduction and excluding any net capital gains. We will also be subject to income tax at regular corporate rates to the extent that we distribute less than 100% of our net taxable income, including any net capital gains. Because of these distribution requirements, we may not be able to fund future capital needs, including any necessary acquisition financing, from operating cash flow. Consequently, we intend to rely on third-party sources for debt or equity financing to fund our growth strategy. In addition, we may need external sources of capital to refinance our indebtedness at maturity. We may not be able to obtain the financing on favorable terms or at all. Our access to third-party sources of capital depends, in part, on:

In addition, our ability to access additional capital may be limited by the terms of our existing indebtedness, which restricts our incurrence of additional debt. If we cannot obtain capital when needed, we may not be able to acquire or develop properties when strategic opportunities arise or refinance our debt at maturity, which could have a material adverse effect on our business.

Most of the expenses associated with our business, such as debt service payments, real estate, personal and ad valorem taxes, insurance, utilities, employee wages and benefits and corporate expenses are relatively inflexible and do not necessarily decrease in tandem with a reduction in revenue from our business. Our expenses will also be affected by inflationary increases and certain of our costs may exceed the rate of

We depend upon carriers and other network providers to deliver network connectivity to customers within our data centers as well as the fiber network interconnection between our data centers. Our hub-and-spoke approach in particular leaves us dependent on these third parties to provide these services between our data centers. We cannot assure you that any network provider will elect to offer its services within new data centers that we develop or that once a network provider has decided to provide connectivity to or between our data centers that it will continue to do so for any period of time. A significant interruption in or loss of these services could impair our ability to attract and retain customers and have a material adverse effect on our business.

Enabling connectivity within and between our data centers requires construction and operation of a sophisticated redundant fiber network. The construction required to connect our data centers is complex and involves factors outside of our control, including the availability of construction resources. If highly reliable connectivity within and between certain of our data centers is not established, is materially delayed, is discontinued or fails, our reputation could be harmed, which could have a material adverse effect on our ability to attract new customers or retain existing ones.

The markets for the data centers that we own and operate, as well as the industries in which our customers operate, are characterized by rapidly changing technology, evolving industry standards, frequent new product introductions and changing customer demands. Our ability to deliver technologically sophisticated power and cooling are significant factors in our customers’ decisions to rent space in our data centers. Our data center infrastructure may become obsolete due to the development of new systems to deliver power to, or eliminate heat from, the servers and other customer equipment that we house. Additionally, our data center infrastructure could become obsolete as a result of the development of new technology that requires levels of power and cooling that our facilities are not designed to provide. Our power and cooling systems are also difficult and expensive to upgrade. Accordingly, we may not be able to efficiently upgrade or change these systems to meet new demands without incurring significant costs that we may not be able to pass on to our customers. The obsolescence of our power and cooling systems would have a material adverse effect on our business. In addition, evolving customer demand could require services or infrastructure improvements that we do not provide or that would be difficult or expensive for us to provide in our current data centers, and we may be unable to adequately adapt our properties or acquire new properties that can compete successfully. We risk losing customers to our competitors if we are unable to adapt to this rapidly evolving marketplace.

Furthermore, potential future regulations that apply to industries we serve may require customers in those industries to seek specific requirements from their data centers that we are unable to provide. These may include physical security requirements applicable to the defense industry and government contractors and privacy and security regulations applicable to the financial services and health care industries. If such regulations were adopted, we could lose some customers or be unable to attract new customers in certain industries, which would have a material adverse effect on our results of operations.

We do not carry insurance for generally uninsured losses such as loss from riots, war, terrorist attacks or acts of God. The properties in our portfolio located in California are subject to risks from earthquakes and our property in Miami is potentially subject to risks related to tropical storms, hurricanes and floods. Together, these properties represented approximately 69.7% of total annualized rent as of June 30, 2010. While we will carry earthquake, hurricane and flood insurance on our properties, the amount of our insurance coverage may not be sufficient to fully cover such losses. In addition, we may discontinue earthquake, hurricane or flood insurance on some or all of our properties in the future if the cost of premiums for any of these policies exceeds, in our judgment, the value of the coverage relative to the risk of loss.

If we experience a loss which is uninsured or which exceeds our policy coverage limits, we could lose the capital invested in the damaged properties as well as the anticipated future cash flows from those properties. In addition, if the damaged properties are subject to recourse indebtedness, we would continue to be liable for the indebtedness, even if these properties were irreparably damaged.

In addition, even if damage to our properties is covered by insurance, a disruption of our business caused by a casualty event may result in the loss of business or customers. We carry a limited amount of business interruption insurance, but such insurance may not fully compensate us for the loss of business or customers due to an interruption caused by a casualty event. See “— Any failure of our physical infrastructure or services could lead to significant costs and disruptions that could reduce our revenues, harm our business reputation and have a material adverse effect on our financial results.”

The recent disruption in the financial markets makes it more difficult to evaluate the stability and net assets or capitalization of insurance companies, and any insurer’s ability to meet its claim payment obligations. A failure of an insurance company to make payments to us upon an event of loss covered by an insurance policy could have a material adverse effect on our business and financial condition.

Furthermore, the properties in our portfolio have historically been covered under The Carlyle Group’s umbrella insurance policy which covers all of Carlyle’s real estate investments. Upon completion of this offering, we will no longer be covered by this umbrella policy. We plan to obtain similar coverage for our portfolio, but because we would no longer have the benefit of the diversification of insured risk under Carlyle’s umbrella policy for its entire real estate portfolio, we expect that our insurance premiums will be higher following the completion of this offering and the Restructuring Transactions.

Our top ten customers accounted for approximately 36.7% of our total annualized rent as of June 30, 2010. During the second quarter of 2010, we expanded our relationship with our largest customer, Facebook, Inc. This customer represented 13.5% of our annualized rent as of June 30, 2010, and we expect that this customer will account for approximately 10% of our pro forma revenues for the year ending December 31, 2010. We currently depend, and expect to continue to depend, upon a relatively small number of customers for a significant percentage of our net revenue. Some of our customers may experience a downturn in their businesses or other factors which may weaken their financial condition and result in them failing to make timely rental payments, defaulting on their leases, reducing the level of interconnection services they obtain or the amount of space they lease from us upon renewal of their leases or terminating their relationship with us. The loss of one or more of our significant customers or a customer exerting significant pricing pressure on us could also have a material adverse effect on our results of operations.

In addition, our largest customers may choose to develop new data centers or expand existing data centers of their own. In the event that any of our key customers were to do so, it could result in a loss of business to us or increase pricing pressure on us. If we lose a customer, there is no guarantee that we would be able to replace that customer at a competitive rate or at all.

Some of our largest customers may also compete with one another in various aspects of their businesses. The competitive pressures on our customers may have a negative impact on our operations. For instance, one customer could determine that it is not in that customer’s interest to house mission-critical servers in a facility operated by the same company that relies on a key competitor for a significant part of its annual revenue. Our loss of a large customer for this or any other reason could have a material adverse effect on our results of operations.

We rely on third parties to provide power to our data centers, and we cannot ensure that these third parties will deliver such power in adequate quantities or on a consistent basis. If the amount of power available to us is inadequate to support our customer requirements, we may be unable to satisfy our obligations to our customers or grow our business. In addition, our data centers are susceptible to power

In addition, we may be subject to risks and unanticipated costs associated with obtaining power from various utility companies. Municipal utilities in areas experiencing financial distress may increase rates to compensate for financial shortfalls unrelated to either the cost of production or the demand for electricity. Other utilities that serve our data centers may be dependent on, and sensitive to price increases for, a particular type of fuel, such as coal, oil or natural gas. In addition, the price of these fuels and the electricity generated from them could increase as a result of proposed legislative measures related to climate change or efforts to regulate carbon emissions. In any of these cases, increases in the cost of power at any of our data centers would put those locations at a competitive disadvantage relative to data centers served by utilities that can provide less expensive power.

We continually evaluate the market for available properties and may acquire data centers or properties suited for data center development when opportunities exist. Our ability to acquire properties on favorable terms and successfully develop and operate them involves significant risks including, but not limited to:

In the past we have acquired properties that did not perform up to our expectations and there can be no assurance that this will not happen again. If we are unable to successfully acquire, redevelop, develop and operate data center properties, our ability to grow our business, compete and meet market expectations will be significantly impaired, which would have a material adverse effect on the price of our common stock.

Assets and entities that we have acquired or may acquire in the future, including the properties contributed by the Carlyle real estate funds or their affiliates, may be subject to unknown or contingent liabilities for which we may have limited or no recourse against the sellers. Unknown or contingent liabilities might include liabilities for clean-up or remediation of environmental conditions, claims of customers, vendors

For example, under the contribution agreement pursuant to which the Carlyle real estate funds or their affiliates are contributing the properties that will comprise our portfolio to the operating partnership, each of the Carlyle real estate funds or their affiliates will make certain representations and warranties as to certain material matters related to the property being contributed by such fund or affiliate such as title to any owned property, compliance with laws (including environmental laws) and the enforceability of certain material customer contracts and leases. In the event that such representations and warranties are not true and correct when made and as of the date the offering is priced, the party that contributed the property to which such losses relate will indemnify the operating partnership for any resulting losses, but only to the extent the amount of losses exceeds 1% of the aggregate value of the operating partnership units received by all of the Carlyle funds or their affiliates (based upon the initial offering price) and provided that the liability of each contributor will be limited to 10% of the value of the operating partnership units (based upon the initial offering price) received by such contributor (adjusted for any operating partnership units purchased by us from the Carlyle real estate funds or their affiliates at closing) in connection with the Restructuring Transactions, and, with respect to any liability that arises from a specific contributed property, the indemnification by such Carlyle real estate fund or its affiliate will be limited to 10% of the value of the operating partnership units issued in respect of such contributed property. As a result, we will be solely responsible and will not be able to seek indemnification from the Carlyle real estate funds or their affiliates to the extent that any losses do not meet this minimum threshold amount or exceed the maximum threshold amount. In addition, the representations and warranties made by the Carlyle real estate funds or their affiliates will only survive for a period of one year after the completion of this offering and in the event that we do not become aware of a breach until after the end of such period or if we otherwise fail to assert a claim prior to such date, we will have no further recourse against the contributors.

As a result, there is no guarantee that we will recover any amounts with respect to losses due to breaches by the sellers of their representations and warranties. In addition, the total amount of costs and expenses that we may incur with respect to liabilities associated with acquired properties and entities may exceed our expectations, which may adversely affect our operating results and financial condition. Finally, indemnification agreements between us and the sellers typically provide that the sellers will retain certain specified liabilities relating to the assets and entities acquired by us. While the sellers are generally contractually obligated to pay all losses and other expenses relating to such retained liabilities, there can be no guarantee that such arrangements will not require us to incur losses or other expenses as well.

As of June 30, 2010, we had the ability to expand our operating data center square footage by 865,621 NRSF by redeveloping 419,371 NRSF of vacant space and developing up to 446,250 NRSF of new data center space on land we currently own. Our growth depends upon the successful completion of the redevelopment and development of this space and similar projects in the future. Current and future redevelopment and development projects will involve substantial planning, allocation of significant company resources and certain risks, including risks related to financing, zoning, regulatory approvals, construction costs and delays. These projects will also require us to carefully select and rely on the experience of one or more general contractors and associated subcontractors during the construction process. Should a general contractor or significant subcontractor experience financial or other problems during the construction process, we could experience significant delays, increased costs to complete the project and other negative impacts to our expected returns.

In addition, we will be subject to risks and, potentially, unanticipated costs associated with obtaining access to a sufficient amount of power from local utilities, including the need, in some cases, to develop utility substations on our properties in order to accommodate our power needs, constraints on the amount of electricity that a particular locality’s power grid is capable of providing at any given time, and risks associated with the negotiation of long-term power contracts with utility providers. We cannot assure you that we will be able to successfully negotiate such contracts on acceptable terms or at all. Any inability to negotiate utility contracts on a timely basis or on acceptable financial terms or in volumes sufficient to supply the requisite power for our development properties would have a material negative impact on our growth and future results of operations and financial condition.

These and other risks could result in delays or increased costs or prevent the completion of our redevelopment and development projects, any of which could have a material adverse effect on our financial condition, results of operations, cash flow, the trading price of our common stock and our ability to satisfy our debt service obligations or pay dividends.

We do not own the buildings for three of our data centers and our business could be harmed if we are unable to renew the leases for these data centers at favorable terms or at all. The following table summarizes the remaining primary term and renewal rights associated with each of our leased properties:

When the primary term of our leases expire, we have the right to extend the terms of our leases as indicated above. For two of these leases, the rent will be determined based on the fair market value of rental rates for this property and the then prevailing rental rates may be higher than rental rates under the applicable lease. To maintain the operating profitability associated with our present cost structure, we must increase revenues within existing data centers to offset the anticipated increase in lease payments at the end of the original and renewal terms. Failure to increase revenues to sufficiently offset these projected higher costs would adversely impact our operating income. Upon the end of our renewal options, we would have to renegotiate our lease terms with the landlord.

If we are not able to renew the lease at any of our data centers, the costs of relocating the equipment in such data centers and redeveloping a new location into a high-quality data center could be prohibitive. In addition, we could lose customers due to the disruptions in their operations caused by the relocation. We could also lose those customers that choose our data centers based on their locations.

As of June 30, 2010, after giving pro forma effect to the Financing Transactions, we would have had a total combined indebtedness of approximately $124.9 million (excluding a $2.0 million fair value of debt adjustment resulting from the Restructuring Transactions), all of which would have been secured indebtedness. We also expect to have the ability to borrow up to an additional $100.8 million under our new $110.0 million revolving credit facility, subject to satisfying certain financial tests, all of which if incurred will be secured indebtedness. Upon completion of this offering, there will be no limits on the amount of indebtedness we may incur other than limits contained in our revolving credit facility, mortgage loans or future agreements that we may enter into or

The agreements governing our indebtedness contain covenants that place restrictions on us and our subsidiaries. These covenants may restrict, among other things, our and our subsidiaries’ ability to:

These covenants could impair our ability to grow our business, take advantage of attractive business opportunities or successfully compete. In addition, our new revolving credit facility will require us to maintain specified financial ratios and satisfy financial condition tests. Our ability to comply with these ratios or tests may be affected by events beyond our control, including prevailing economic, financial and industry conditions. A breach of any of these covenants or covenants under any other agreements governing our indebtedness could result in an event of default. Cross-default provisions in our debt agreements could cause an event of default under one debt agreement to trigger an event of default under our other debt agreements. Upon the occurrence of an event of default under any of our debt agreements, the lenders could elect to declare all outstanding debt under such agreements to be immediately due and payable. If we were unable to repay or refinance the accelerated debt, the lenders could proceed against any assets pledged to secure that debt, including foreclosing on or requiring the sale of our data centers, and our assets may not be sufficient to repay such debt in full.

Following the Restructuring Transactions and Financing Transactions, we expect that our 427 S. LaSalle property will be subject to $40.0 million of secured indebtedness, our 55 S. Market property will be subject to a $60.0 million mortgage loan and our 12100 Sunrise Valley property will be subject to a $32.0 million secured construction loan, of which $24.9 million was outstanding as of June 30, 2010. In addition, borrowings under our new revolving credit facility will be secured by a lien on certain of our properties. Incurring mortgage and other secured debt obligations increases our risk of property losses because defaults on secured indebtedness may result in foreclosure actions initiated by lenders and ultimately our loss of the property securing any loans for which we are in default. For tax purposes, a foreclosure of any of our properties would be treated as a sale of the property for a purchase price equal to the outstanding balance of the debt secured by the mortgage. If the outstanding balance of the debt secured by the mortgage exceeds our tax basis in the property, we would recognize taxable income on foreclosure, but would not receive any cash proceeds, which could hinder our ability to meet the REIT distribution requirements imposed by the Code. As we execute our business plan, we may assume or incur new mortgage indebtedness on our existing properties or properties that we acquire in the future. Any default under any one of our mortgage debt obligations may increase the risk of our default on our other indebtedness.

Our ability to increase occupancy rates in our data centers and grow our business is, in part, dependent upon our ability to market our data center space to a diverse customer base. A more diverse customer base in our data centers creates more networking interconnection opportunities that are valued by our customers, which we believe has generated and will continue to generate incremental revenues in the long-term. Attracting and retaining this diverse customer base will depend on many factors, including the density of interconnection, the operating reliability and security of our data centers, and our ability to market our services effectively across different customer segments. If we fail to maintain a diverse customer base, our business and results of operations may be adversely affected.

As of June 30, 2010, our portfolio of properties consisted of 11 operating data center facilities, one data center under construction and one development site. Nine of the properties being contributed to our portfolio were acquired or developed by the Carlyle real estate funds or their affiliates less than four years prior to the date of this offering, including one facility, 2901 Coronado, which was completed during the second quarter of 2010. Because these properties have been in operation for a relatively short period of time, we may be unaware of characteristics of or deficiencies in such properties that could adversely affect their valuation or revenue potential and such properties may not ultimately perform up to our expectations.

The initial public offering price of our common stock has been determined in consultation with the underwriters and based on a number of factors, including our results of operations, management, estimated net income, estimated funds from operations, estimated cash available for distribution, anticipated dividend yield and growth prospects, the current market valuations, financial performance and dividend yields of publicly traded companies considered to be comparable to us and the current state of the data center industry and the economy as a whole, as well as market demand for this offering. As a result, the initial public offering price does not necessarily bear any relationship to our book value, the fair market value of our assets or the appraised value of our properties. Consequently, the operating partnership units received by the Carlyle real estate funds or their affiliates, if valued on an as exchanged basis for shares of our common stock at the per share price set forth on the cover of this prospectus, may exceed the fair market value or the appraised value

Although we have obtained preliminary appraisals of each of the Acquired Properties in connection with the preparation of our pro forma condensed consolidated financial statements included elsewhere in this prospectus, such appraisals did not cover the properties of our Predecessor, do not accurately reflect the value of our company as a whole and the assumptions, judgments and methodologies used in connection with these appraisals may be different than those used by investors in our common stock. Additionally, while the entities contributing the properties to our operating partnership in connection with the Restructuring Transactions obtained a third party opinion from an independent financial advisor regarding the fairness to each of these entities, from a financial point of view, of the allocation of the operating partnership units as among these entities to be received in consideration for the property or properties contributed by each such entity based on estimated valuations of the properties held by each fund, which valuations were obtained solely for the purpose of allocating the operating partnership units as among these entities. Further, the independent financial advisor used a variety of customary valuation methodologies and certain assumptions and judgments to determine a range of valuations of the individual properties and no related appraisal or physical inspection of the properties was conducted and no attempt was made to value the properties as a single operating company. Accordingly, the assumptions, judgments and methodologies used in connection with these valuations may also be different than those used by public stockholders in assessing the value of our company taken as a whole. In addition, while our lenders have conducted appraisals of some of our properties in connection with determining for loan purposes whether the collateral value is sufficient to support the amount of the loans, we have not obtained or reviewed copies of such appraisals.

A party who is able to compromise the security measures on our networks or the security of our infrastructure could misappropriate our proprietary information and the personal information of our customers, and cause interruptions or malfunctions in our or our customers’ operations. We may be required to expend significant financial resources to protect against such threats or to alleviate problems caused by security breaches. As techniques used to breach security change frequently and are generally not recognized until launched against a target, we may not be able to implement security measures in a timely manner or, if and when implemented, these measures could be circumvented. Any breaches that may occur could expose us to increased risk of lawsuits, loss of existing or potential customers, harm to our reputation and increases in our security costs, which could have a material adverse effect on our financial performance and operating results.

We have agreed with each of the Carlyle real estate funds or their affiliates which have directly or indirectly contributed their interests in the properties in our portfolio to our operating partnership that if we directly or indirectly sell, convey, transfer or otherwise dispose of all or any portion of these interests in a taxable transaction, we will make an interest-free loan to the contributors in an amount equal to the contributor’s tax liabilities, based on an assumed tax rate. Any such loan would be repayable out of the after tax-proceeds (based on an assumed tax rate) of any distribution from the operating partnership to, or any sale of operating partnership units (or common stock issued by us in exchange for such units) by, the recipient of such loan, and would be non-recourse to the borrower other than with respect to such proceeds. These tax protection provisions apply for a period expiring on the earlier of (i) the seventh anniversary of the completion of this offering and (ii) the date on which these contributors (or certain transferees) dispose in certain taxable transactions of 90% of the operating partnership units that were issued to them in connection with the contribution of these properties. See “Certain Relationships and Related Party Transactions—Tax Protection Agreement.”

We are subject to a variety of state and local taxes, including real and personal property taxes and sales and use taxes that may increase materially due to factors outside our control. In particular, taxes on our properties may increase as tax rates change and as the properties are assessed or reassessed by taxing

Because real estate investments are relatively illiquid, our ability to promptly sell one or more properties in our portfolio in response to adverse changes in the real estate market or in the performance of such properties may be limited, thus harming our financial condition. The real estate market is affected by many factors that are beyond our control, including:

The risks associated with the illiquidity of real estate investments are even greater for our data center properties. Our data centers are highly specialized real estate assets containing extensive electrical and mechanical systems that are uniquely designed to house and maintain our customers’ equipment, and, as such, have little, if any, traditional office space. As a result, most of our data centers are not suited for use by customers as anything other than as data centers and major renovations and expenditures would be required in order for us to re-lease data center space for more traditional commercial or industrial uses, or for us to sell a property to a buyer for use other than as a data center.

Environmental liabilities could arise and have a material adverse effect on our financial condition and performance. Federal, state and local laws and regulations relating to the protection of the environment may require a current or previous owner or operator of real estate to investigate and remediate hazardous or toxic substances or petroleum product releases at or from the property. In addition, we could incur costs to comply with such laws and regulations, the violation of which could lead to substantial fines and penalties.

We may have to pay governmental entities or third parties for property damage and for investigation and remediation costs that they incurred in connection with any contamination at our current and former properties without regard to whether we knew of or caused the presence of the contaminants. Even if more than one person may have been responsible for the contamination, each person covered by these environmental laws may be held responsible for all of the clean-up costs incurred.

Some of our properties contain or may contain asbestos-containing building materials. Environmental laws may impose fines and penalties on building owners or operators who fail to properly manage and maintain these materials, notify and train persons who may come into contact with asbestos and undertake special precautions, and third parties could potentially seek recovery from owners or operators for any personal injury associated with exposure to asbestos-containing building materials.

Some of our properties may also contain or develop harmful mold or suffer from other air quality issues. As a result, the presence of significant mold or other airborne contaminants at any of our properties could require us to undertake a costly remediation program to contain or remove the mold or other airborne contaminants from the affected property or increase indoor ventilation. In addition, the presence of significant mold or other airborne contaminants could expose us to liability from our customers, employees of our customers and others if property damage or health concerns arise.

Climate change regulation is a rapidly developing area. Congress is currently considering new laws relating to climate change, including potential cap-and-trade systems, carbon taxes, and other requirements relating to reduction of carbon footprints and/or greenhouse gas emissions. Other countries have enacted climate change laws and regulations, and the United States has been involved in discussions regarding international climate change treaties. The U.S. Environmental Protection Agency, or EPA, and some of the states and localities in which we operate, have also enacted certain climate change laws and regulations, and/or have begun regulating carbon footprints and greenhouse gas emissions. Although these laws and regulations have not had an adverse effect on our business to date, they could limit our ability to develop new facilities or result in substantial compliance costs, retrofit costs and construction costs, including capital expenditures for environmental control facilities and other new equipment. We could also face a negative impact on our reputation with the public if we violate climate change laws or regulations.

An initial study and MND are currently being prepared by the City of Santa Clara in connection with our proposed development plan for the Coronado-Stender Business Park. The MND, if adopted, would determine that the proposed development, as mitigated, will not have a significant impact on the environment. If the City of Santa Clara does not adopt the MND or certify an EIR for the project, we would only be able to develop the currently permitted additional 179,600 NRSF of data center space at this property as compared to up to 446,250 NRSF of additional data center space at the Coronado-Stender Business Park if the MND is adopted. The MND is subject to public-review and public-hearing processes at the City of Santa Clara.

Based on statements from representatives of the City of Santa Clara, we currently anticipate that the MND will be adopted prior to December 31, 2010. However, we cannot assure you that adoption will occur within the anticipated time frame or that we will receive any entitlement to construct more than the 176,600 NRSF currently on the site.

Our Board of Directors will determine our major corporate policies, including our acquisition, investment, financing, growth, operations and distribution policies and whether to maintain our status as a REIT. In particular, we anticipate that our Board of Directors will adopt a policy of limiting the amount of indebtedness we incur. However, our organizational documents do not limit the amount or percentage of indebtedness, funded or otherwise, that we may incur. Our Board of Directors may alter or eliminate our current corporate policies, including our policy on borrowing at any time without stockholder approval. Accordingly, while our stockholders have the power to elect or remove directors, our stockholders will have limited direct control over changes in our policies and those changes could adversely affect our business, financial condition, results of operations, the market price of our common stock and our ability to make distributions to our stockholders.

Upon completion of this offering, the Carlyle real estate funds or their affiliates will have an aggregate beneficial ownership interest in our operating partnership of approximately 62.8% which, if exchanged for our common stock, would represent an approximately 62.7% interest in our common stock. In addition, the operating partnership agreement will initially grant the Carlyle real estate funds and their affiliates the right to initially nominate two of the seven directors to our Board of Directors. See “Description of the Partnership Agreement of CoreSite, L.P.”

As a result, the Carlyle real estate funds or their affiliates will have the ability to exercise substantial influence over our company, including with respect to decisions relating to our capital structure, issuing additional shares of our common stock or other equity securities, paying dividends, incurring additional debt, making acquisitions, selling properties or other assets, merging with other companies and undertaking other extraordinary transactions. In any of these matters, the interests of the Carlyle real estate funds and their affiliates may differ from or conflict with the interests of our other stockholders. In addition, the Carlyle real estate funds or their affiliates are in the business of making investments in companies and may, from time to time, acquire interests in businesses that directly or indirectly compete with our business, as well as businesses that are significant existing or potential customers. The Carlyle real estate funds and their affiliates may acquire or seek to acquire assets that we seek to acquire and, as a result, those acquisition opportunities may not be available to us or may be more expensive for us to pursue.

Our charter and bylaws contain a number of provisions, the exercise or existence of which could delay, defer or prevent a transaction or a change in control that might involve a premium price for our stockholders or otherwise be in their best interests, including the following:

See “Description of Securities” for additional information on the anti-takeover measures applicable to us.

Certain provisions of the Maryland General Corporation Law, or MGCL, may have the effect of inhibiting a third party from making a proposal to acquire us or of impeding a change of control under circumstances that otherwise could provide our common stockholders with the opportunity to realize a premium over the then-prevailing market price of such shares, including:

We have opted out of these provisions of the MGCL, in the case of the business combination provisions of the MGCL, by resolution of our Board of Directors and, in the case of the control share provisions of the MGCL, by a provision in our bylaws. However, our Board of Directors may elect to opt into these provisions if approved by our stockholders by the affirmative vote of a majority of votes cast and with the consent of the Carlyle real estate funds or their affiliates, provided that the consent of the Carlyle entities will not be required unless, in the case of the control share provisions, such provisions would apply to the Carlyle real estate funds and their affiliates, or in either case at such time they own less than 10% of our outstanding common stock (assuming all operating partnership units are exchanged into common stock).

Additionally, Title 3, Subtitle 8 of the MGCL permits our Board of Directors, without stockholder approval and regardless of what is currently provided in our charter or bylaws, to implement certain takeover defenses, such as a classified board, some of which we do not yet have.

We intend to elect to be taxed and to operate in a manner that will allow us to qualify as a REIT for federal income tax purposes under the Code. However, we cannot assure you that we will qualify or will remain qualified as a REIT. If, in any taxable year, we lose our REIT status, we will face serious tax consequences that would substantially reduce our cash available for distribution to you for each of the years involved because:

Our failure to qualify as a REIT could also impair our ability to expand our business and raise capital, and would materially adversely affect the value of our common stock.

We have no operating history as a REIT or a public company. As a result, we cannot assure you that our past experience will be sufficient to successfully operate our company as a REIT or a public company. Although certain of our executive officers and directors have experience in the real estate industry, and Mr. Ray, our President and Chief Executive Officer and Ms. Beckman, our Chief Financial Officer, have previously held positions with publicly traded REITs, we cannot assure you that our past experience will be sufficient to operate a business in accordance with the Code requirements for REIT qualification or in accordance with the requirements of the SEC and the NYSE for public companies. Upon completion of this offering, we will be required to develop and implement substantial control systems and procedures in order to qualify and maintain our qualification as a REIT, satisfy our periodic and current reporting requirements under applicable SEC regulations and comply with NYSE listing standards. As a result, we will incur significant legal, accounting and other expenses that we did not incur as a private company and our management and other personnel will need to devote a substantial amount of time to comply with these rules and regulations and establish the corporate infrastructure and controls demanded of a publicly-traded REIT. These costs and time commitments could be substantially more than we currently expect. In connection with our operation as a public company, we will be required to report our operations on a consolidated basis, which we have not done before. We are in the process of implementing an internal audit function and modifying our company-wide systems and procedures in a number of areas to enable us to report on a consolidated basis as we continue the process of integrating the financial reporting of the entities we intend to acquire in connection with the Restructuring Transactions. If our finance and accounting organization is unable for any reason to respond adequately to the increased demands that will result from being a public company, the quality and timeliness of our financial reporting may suffer and we could experience significant deficiencies or material weaknesses in our disclosure controls and procedures or our internal control over financial reporting. An inability to establish effective disclosure controls and procedures and internal control over financial reporting could cause us to fail to meet our reporting obligations under the Securities Exchange Act of 1934, as amended, or Exchange Act, on a timely basis or result in material misstatements or omissions in our Exchange Act reports, either of which could cause investors to lose confidence in our company and could have a material adverse effect on our operating results and the trading price of our common stock.

We will be a domestically-controlled REIT if, at all times during a specified testing period, less than 50% in value of our shares is held directly or indirectly by non-U.S. stockholders. However, because our shares will be publicly traded following this offering, we cannot guarantee that we will in fact be a domestically-controlled REIT. If we fail to qualify as a domestically-controlled REIT, our non-U.S. stockholders that otherwise would not be subject to federal income tax on the gain attributable to a sale of our shares of common stock would be subject to taxation upon such a sale if either (1) the shares of common stock were not considered to be regularly traded under applicable Treasury Regulations on an established securities market, such as the NYSE, or (2) the selling non-U.S. stockholder owned, actually or constructively, more than 5% in value of the outstanding shares of common stock being sold during specified testing periods. If gain on the sale or exchange of our shares of common stock was subject to taxation for these reasons, the non-U.S. stockholder would be subject to regular U.S. income tax with respect to any gain on a net basis in a manner similar to the taxation of a taxable U.S. stockholder, subject to any applicable alternative minimum tax and special alternative minimum tax in the case of nonresident alien individuals, and corporate non-U.S. stockholders may be subject to an additional branch profits tax, as described in “Federal Income Tax Considerations—Taxation of Non-U.S. Stockholders.”

In order to maintain our qualification as a REIT, we are required under the Code to distribute at least 90% of our net taxable income annually to our stockholders. In any period our net taxable income may be greater than the cash flow from operations. In addition, we may become party to debt agreements that include cash management or similar provisions, pursuant to which revenues generated by properties subject to such indebtedness are immediately, or upon the occurrence of certain events, swept into an account for the benefit of the lenders under such debt agreements, which revenues would typically only become available to us after the funding of reserve accounts for, among other things, debt service, taxes, insurance and leasing commissions. If our properties do not generate sufficient cash flow, we may be required to fund distributions from working capital, borrowings under our new revolving credit facility, proceeds from this offering, the sale of assets or by obtaining other debt or equity financing, which may not be available, pay dividends in the form of taxable stock dividends in order to meet our distributions requirements or reduce expected distributions, any of which could have a material adverse effect on the price of our common stock.

As a REIT we are subject to various restrictions on our income, assets and activities. These include restrictions on our ability to pursue certain strategic acquisitions or business combinations and our ability to enter into other lines of business. Due to these restrictions, we anticipate that we will conduct certain business activities, such as interconnection services, in one or more taxable REIT subsidiaries. Our taxable REIT subsidiaries are taxable as regular C corporations and are subject to federal, state, local, and, if applicable, foreign taxation on their taxable income at applicable corporate income tax rates. However, we may still be limited in the business activities we can pursue.

Notwithstanding our status as a REIT, we will be subject to certain federal, state and local taxes on our income and property. For example, we will pay tax on certain types of income that we do not distribute and will incur a 100% excise tax on transactions with our TRS that are not conducted on an arm’s length basis. Moreover, our TRS is taxable as a regular C corporation and will pay federal, state and local income tax on its net income at the applicable corporate rates.

We expect that the properties that we will acquire in the Restructuring Transactions generally will have a carryover tax basis that is lower than the respective fair market values of the properties. This could result in lower depreciation deductions on these properties, thereby (i) increasing the distribution requirement imposed on us which could adversely affect our ability to satisfy the REIT distribution requirement, and (ii) decreasing the extent to which our distributions are treated as tax-free “return of capital” distributions.

A significant portion of the value of our properties is attributable to structural components related to the provision of electricity, heating, ventilation and air conditioning, humidification regulation, security and fire protection, and telecommunication services. We have received a private letter ruling from the Internal Revenue Service, or the IRS, holding, among other things, that our buildings, including the structural components, constitute real property for purposes of the REIT qualification requirements. We are entitled to rely upon that private letter ruling only to the extent that we did not misstate or omit a material fact in the ruling request we submitted to the IRS and that we operate in the future in accordance with the material facts described in that request. Moreover, the IRS, in its sole discretion, may revoke the private letter ruling. If our structural components are determined not to constitute real property for purposes of the REIT qualification requirements, including as a result of our being unable to rely upon the private letter ruling or the IRS revoking that ruling, we would fail to qualify as a REIT, which could have a material adverse effect on the value of our common stock.

One of the factors that may influence the price of our common stock is the dividend yield on our common stock (the amount of dividends as a percentage of the price of our common stock) relative to market interest rates. An increase in market interest rates, which are currently at low levels relative to historical rates, may lead prospective purchasers of our common stock to expect a higher dividend yield, which we may be unable or choose not to provide. Higher interest rates would likely increase our borrowing costs and potentially decrease the cash available for distribution. Thus, higher market interest rates could cause the market price of our common stock to decline.

We cannot predict whether future issuances of shares of our common stock or the availability of shares of our common stock for resale in the open market will decrease the market price per share of our common stock. Sales of a substantial number of shares of our common stock in the public market, either by us or by holders of operating partnership units upon exchange of such units for our common stock, or the perception that such sales might occur, could materially adversely affect the market price of the shares of our common stock. The Carlyle real estate funds or their affiliates, as holders of the 28,700,000 operating partnership units to be issued in the Restructuring Transactions, will have the right to require us to register with the SEC the resale of the common stock issuable, if we so elect, upon redemption of these operating partnership units. Such funds or affiliates are restricted from exercising their redemption rights prior to the first anniversary of the completion of this offering. In addition, after completion of this offering, we intend to register 3,000,000 shares of common stock that we have reserved for issuance under our equity incentive plan, and once registered they can generally be freely sold in the public market after issuance, assuming any applicable restrictions and vesting requirements are satisfied. In addition, except as described herein, we, our operating partnership our directors and officers and the Carlyle real estate funds or their affiliates have agreed with the underwriters not to offer, sell, contract to sell, pledge or otherwise dispose of any shares of common stock, operating partnership units or other securities convertible or exchangeable into our common stock for a period of 180 days (or 365 days in the case of the Carlyle real estate funds or their affiliates) after the date of this prospectus; however, these lock-up agreements are subject to numerous exceptions and the representatives of the underwriters may waive these lock-up provisions without notice. If any or all of these holders cause a large number of their shares to be sold in the public market, the sales could reduce the trading price of our common stock and could impede our ability to raise future capital. In addition, the exercise of the underwriters’ option to purchase up to an additional 2,535,000 shares of our common stock or other future issuances of our common stock would be dilutive to existing stockholders.

We believe that the market value of a REIT’s equity securities is based primarily upon market perception of the REIT’s growth potential and its current and potential future cash distributions, whether from operations, sales, acquisitions, development or refinancing, and is secondarily based upon the value of the underlying assets. For these reasons, shares of our common stock may trade at prices that are higher or lower than the net asset value per share. To the extent we retain operating cash flow for investment purposes, working capital reserves or other purposes rather than distributing the cash flow to stockholders, these retained funds, while increasing the value of our underlying assets, may negatively impact the market price of our common stock. Our failure to meet market expectations with regard to future earnings and cash distributions would likely adversely affect the market price of our common stock.

Even if an active trading market develops for our common stock, the market price of our common stock may be volatile. In addition, the trading volume in our common stock may fluctuate and cause significant price variations to occur. If the market price of our common stock declines significantly, you may be unable to

Some of the factors that could negatively affect the market price of our common stock or result in fluctuations in the price or trading volume of our common stock include:

There has not been any public market for our common stock prior to this offering. Our common stock has been authorized for listing on the NYSE, subject to notice of official issuance. We cannot assure you, however, that an active trading market for our common stock will develop after this offering or, if one develops, that it will be sustained. In the absence of a public market, you may be unable to liquidate an investment in our common stock. The initial public offering price of our common stock has been determined in consultation with the underwriters and based on a number of factors, including our results of operations, management, estimated net income, estimated funds from operations, estimated cash available for distribution, anticipated dividend yield and growth prospects, the current market valuations, financial performance and dividend yields of publicly traded companies considered to be comparable to us and the current state of the data center industry and the economy as a whole. The price at which shares of our common stock trade after the completion of this offering may be lower than the price at which the underwriters sell them in this offering.

We expect the initial public offering price of our common stock to be substantially higher than the book value per share of our outstanding common stock immediately after this offering. If you purchase our common stock in this offering, you will incur immediate dilution of approximately $4.69 in the book value per share of common stock from the price you pay for our common stock in this offering, based on an initial public offering price of $16.00 per share. See “Dilution” for further discussion of how your ownership interest in us will be immediately diluted.

This prospectus includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements provide our current expectations or forecasts of future events. Forward-looking statements include statements about our expectations, beliefs, intentions, plans, objectives, goals, strategies, future events, performance and underlying assumptions and other statements that are not historical facts. You can identify forward-looking statements by their use of forward-looking words, such as “may,” “will,” “anticipates,” “expect,” “believe,” “intend,” “plan,” “should,” “seek” or comparable terms, or the negative use of those words, but the absence of these words does not necessarily mean that a statement is not forward-looking.

These forward-looking statements are made based on our expectations and beliefs concerning future events affecting us and are subject to uncertainties and factors relating to our operations and business environment, all of which are difficult to predict and many of which are beyond our control, that could cause our actual results to differ materially from those matters expressed in or implied by these forward-looking statements.

Important factors that could cause actual results to differ materially from our expectations are disclosed under “Risk Factors” and elsewhere in this prospectus. These factors include, among others:

Except as required by law, we do not undertake any responsibility to release publicly any revisions to these forward-looking statements to take into account events or circumstances that occur after the date of this prospectus or to update you on the occurrence of any unanticipated events which may cause actual results to differ from those expressed or implied by the forward-looking statements contained in this prospectus.

We estimate that the net proceeds to us from the sale of 16,900,000 shares of common stock will be approximately $245.8 million, or $283.5 million if the underwriters exercise their over-allotment option in full, after deducting underwriting discounts and commissions and estimated offering expenses of approximately $24.6 million payable by us.

We will use the proceeds of this offering to:

Our operating partnership will subsequently use the proceeds received from us as follows:

We intend to elect to be taxed and to operate in a manner that will allow us to qualify as a REIT for U.S. federal income tax purposes, commencing with our tax year ending December 31, 2010. In order to qualify as a REIT under the Code, we generally must make distributions to our stockholders each year in an amount equal to at least:

CoreSite Realty Corporation intends to cause its operating partnership to make regular quarterly distributions to holders of operating partnership units (including CoreSite Realty Corporation), and CoreSite Realty Corporation intends to use its share of cash distributions received from the operating partnership to make regular quarterly distributions to holders of its common stock. We intend to pay an initial distribution with respect to the period commencing on October 1, 2010 and ending on December 31, 2010, based on a distribution of $0.13 per share for a full quarter. On an annualized basis, this would be $0.52 per share, or an annual distribution rate of approximately 3.3% based on an initial public offering price of $16.00 per share (of which we currently estimate 100.0% may represent a return of capital for tax purposes). We estimate that this initial annual distribution rate will represent approximately 78% of estimated cash available for distribution for the twelve months ending June 30, 2011 on a pro forma basis. We have estimated our cash available for distribution to our common stockholders for the 12 months ending June 30, 2011 based on adjustments to our pro forma as adjusted net income available to common stockholders for the 12 months ended June 30, 2010 (giving effect to the Restructuring Transactions and the Financing Transactions), as described below. This estimate was based upon the historical operating results of our Predecessor and the Acquired Properties, as adjusted on a pro forma basis for the Restructuring Transactions and the Financing Transactions and does not take into account any additional investments and their associated cash flows, unanticipated expenditures that we may have to make or any additional debt we may incur. In estimating our cash available for distribution to holders of our common stock, we have made certain assumptions as reflected in the table and footnotes below. To the extent our initial annual distribution is in excess of 100% of our estimated cash available for distribution, we will use existing cash to fund such shortfall or possibly borrowings under our new revolving credit facility.

We anticipate that, at least initially, our distributions will exceed our then current and accumulated earnings and profits as determined for federal income tax purposes primarily due to depreciation and amortization charges that we expect to incur. Therefore, we anticipate that a portion of these distributions will represent a return of capital for federal income tax purposes. The percentage of our stockholder distributions that exceeds our current and accumulated earnings and profits, if any, may vary substantially from year to year. For a discussion of the tax treatment of distributions to holders of our common stock, see “Federal Income Tax Considerations.”

We intend to maintain our initial distribution rate for the 12-month period following completion of this offering unless actual results of operations, economic conditions or other factors differ materially from the assumptions used in our estimate. Distributions made by us will be authorized by our Board of Directors out of funds legally available and therefore will be dependent upon a number of factors, including restrictions under applicable law. We believe that our estimate of cash available for distribution constitutes a reasonable basis for setting the initial distribution; however, the actual amount, timing and frequency of our distributions will be at the discretion of, and authorized by, our Board of Directors and will depend on our actual results of operations and a number of other factors, including:

We may retain earnings of our TRS, and such amount of cash would not be available to satisfy the 90% distribution requirement. If our cash available for distribution to our stockholders is less than 90% of our REIT taxable income, we could be required to sell assets or borrow funds to make distributions. Dividend distributions to our stockholders will generally be taxable to our stockholders as ordinary income to the extent of our current or accumulated earnings and profits.

We cannot assure you that our estimated distributions will be made or sustained. Any distributions we pay in the future will depend upon our actual results of operations, economic conditions and other factors that could differ materially from our current expectations. Our actual results of operations will be affected by a number of factors, including the revenue we receive from our properties, our operating expenses, interest expense, the ability of our customers to meet their obligations and unanticipated expenditures. If our properties do not generate sufficient cash flow, we may be required to fund distributions from (i) working capital, which could include proceeds from this offering, (ii) borrowings under our new revolving credit facility or (iii) from other debt or equity financing, which may not be available. If our properties fail to generate sufficient cash flow, we may also be forced to pay dividends in the form of taxable stock dividends in order to meet our distributions requirements or reduce expected distributions. For more information regarding risk factors that could materially adversely affect our actual results of operations and our ability to make distributions to our stockholders, see “Risk Factors,” including “Risks Related to Our Status as a REIT— Our cash available for distribution to stockholders may not be sufficient to pay distributions at expected levels or at all.”

The following table describes our pro forma income (loss) from continuing operations before non-controlling interests for the year ended December 31, 2009, and the adjustments we have made thereto in order to estimate our initial cash available for distribution for the twelve months ending June 30, 2011 (amounts in thousands except share data, per share data, square footage data and percentages):

The following table sets forth the capitalization of our Predecessor as of June 30, 2010 on: (i) a historical basis; (ii) a pro forma basis to reflect the Restructuring Transactions (but excluding the Financing Transactions) and (iii) a pro forma as adjusted basis to reflect the Restructuring Transactions, the Financing Transactions and the application of the net proceeds from this offering as set forth under “Use of Proceeds.” You should read this table in conjunction with “Use of Proceeds,” “Selected Historical and Pro Forma Financial Data,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources” and our consolidated historical and pro forma financial statements and the notes thereto appearing elsewhere in this prospectus.

Purchasers of our common stock offered in this prospectus will experience an immediate and substantial dilution of the net tangible book value of our common stock from the initial public offering price. At June 30, 2010, our Predecessor had a net tangible book value of approximately $179.8 million, or $12.15 per share of our common stock to be held by holders of the entities contributing our Predecessor in the Restructuring Transactions, assuming the exchange of operating partnership units that will be issued to the entities contributing our Predecessor following the Restructuring Transactions for shares of our common stock on a one-for-one basis. After giving pro forma effect to the Restructuring Transactions, the Financing Transactions, including the sale of the shares of our common stock offered hereby, and the use of proceeds therefrom, the pro forma net tangible book value at June 30, 2010 attributable to common stockholders would have been $519.1 million, or $11.31 per share of our common stock. This amount represents an immediate decrease in net tangible book value of $0.84 per share to existing investors (including holders of operating partnership units) and an immediate dilution in pro forma net tangible book value of $4.69 per share from the initial public offering price of $16.00 per share of our common stock to new public investors. The following table illustrates this per share dilution:

The following table sets forth summary selected financial data on a historical basis for our Predecessor. Our Predecessor is comprised of the real estate activities of four of our operating properties, 1656 McCarthy, 32 Avenue of the Americas, 12100 Sunrise Valley and 70 Innerbelt, as well as the Coronado-Stender Business Park, all wholly owned by CRP Fund V Holdings, LLC. As part of our Restructuring Transactions, we will acquire other data center properties and buildings housing office and other space under common management, which we refer to in this prospectus as our Acquired Properties. Our Acquired Properties include the continuing real estate operations of 55 S. Market, One Wilshire, 1275 K Street, 900 N. Alameda, 427 S. LaSalle and 2115 NW 22nd Street, as well as 1050 17th Street, a property we lease as our corporate headquarters, which does not generate operating revenue. For accounting purposes, our Predecessor is considered to be the acquiring entity in the Restructuring Transactions and, accordingly, the acquisition of our Acquired Properties will be recorded at fair value. For more information regarding the Restructuring Transactions, please see “Structure and Formation of Our Company.”

The historical financial information as of December 31, 2009 and 2008 and for each of the years ended December 31, 2009, 2008 and 2007 has been derived from our Predecessor’s audited financial statements included elsewhere in this prospectus. The historical financial information as of December 31, 2007, 2006 and 2005 and for the years ended December 31, 2006 and 2005 has been derived from our Predecessor’s unaudited financial statements. The historical financial information as of June 30, 2010 and for each of the six months ended June 30, 2010 and 2009 has been derived from our Predecessor’s unaudited financial statements included elsewhere in this prospectus. In the opinion of the management of our company, the unaudited interim financial information included herein includes any adjustments (consisting of only normal recurring adjustments) necessary to present fairly the information set forth herein.

The unaudited pro forma condensed consolidated financial data for the year ended December 31, 2009 and the six months ended June 30, 2010 are presented as if this offering and the Restructuring Transactions and Financing Transactions had all occurred on June 30, 2010 for the pro forma condensed consolidated balance sheet data and as of January 1, 2009 for the pro forma condensed consolidated statement of operations data. Our pro forma financial information is not necessarily indicative of what our actual financial position and results of operations would have been as of the date and for the periods indicated, nor does it purport to represent our future financial position or results of operations.

You should read the following selected financial data in conjunction with our pro forma financial statements, our Predecessor’s historical consolidated and combined financial statements and the related notes thereto, and our Acquired Properties’ historical combined financial statements and the related notes thereto, along with “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” which are included elsewhere in this prospectus.