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<xbrl xmlns="http://www.xbrl.org/2003/instance" xmlns:dei="http://xbrl.sec.gov/dei/2021q4" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:psb="http://psbusinessparks.com/20220720" xmlns:us-gaap="http://fasb.org/us-gaap/2021-01-31" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:xlink="http://www.w3.org/1999/xlink"> |
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| | | <startDate> 2022-07-20 </startDate> |
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| | | <startDate> 2022-07-20 </startDate> |
| | | <endDate> 2022-07-20 </endDate> |
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| <dei:EntityCentralIndexKey contextRef="duration_2022-07-20_to_2022-07-20" id="Hidden_dei_EntityCentralIndexKey_duration_2022-07-20_to_2022-07-20"> 0000866368 </dei:EntityCentralIndexKey> |
| <dei:DocumentType contextRef="duration_2022-07-20_to_2022-07-20"> 8-K </dei:DocumentType> |
| <dei:DocumentPeriodEndDate contextRef="duration_2022-07-20_to_2022-07-20"> 2022-07-20 </dei:DocumentPeriodEndDate> |
| <dei:EntityIncorporationStateCountryCode contextRef="duration_2022-07-20_to_2022-07-20"> MD </dei:EntityIncorporationStateCountryCode> |
| <dei:EntityFileNumber contextRef="duration_2022-07-20_to_2022-07-20"> 001-10709 </dei:EntityFileNumber> |
| <dei:EntityTaxIdentificationNumber contextRef="duration_2022-07-20_to_2022-07-20"> 95-4300881 </dei:EntityTaxIdentificationNumber> |
| <dei:EntityAddressAddressLine1 contextRef="duration_2022-07-20_to_2022-07-20"> 345 Park Avenue </dei:EntityAddressAddressLine1> |
| <dei:EntityAddressCityOrTown contextRef="duration_2022-07-20_to_2022-07-20"> New York </dei:EntityAddressCityOrTown> |
| <dei:EntityAddressStateOrProvince contextRef="duration_2022-07-20_to_2022-07-20"> NY </dei:EntityAddressStateOrProvince> |
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| <dei:SecurityExchangeName contextRef="duration_2022-07-20_to_2022-07-20_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"> NYSE </dei:SecurityExchangeName> |
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| <dei:Security12bTitle contextRef="duration_2022-07-20_to_2022-07-20_us-gaap-StatementClassOfStockAxis_psb-CumulativePreferredStockSeriesYMember"> Depositary Shares Each Representing 1/1,000 of a 5.200% Cum Pref Share, Series Y, $0.01 par value </dei:Security12bTitle> |
| <dei:TradingSymbol contextRef="duration_2022-07-20_to_2022-07-20_us-gaap-StatementClassOfStockAxis_psb-CumulativePreferredStockSeriesYMember"> PSBPrY </dei:TradingSymbol> |
| <dei:SecurityExchangeName contextRef="duration_2022-07-20_to_2022-07-20_us-gaap-StatementClassOfStockAxis_psb-CumulativePreferredStockSeriesYMember"> NYSE </dei:SecurityExchangeName> |
| <dei:Security12bTitle contextRef="duration_2022-07-20_to_2022-07-20_us-gaap-StatementClassOfStockAxis_psb-CumulativePreferredStockSeriesZMember"> Depositary Shares Each Representing 1/1,000 of a 4.875% Cum Pref Share, Series Z, $0.01 par value </dei:Security12bTitle> |
| <dei:TradingSymbol contextRef="duration_2022-07-20_to_2022-07-20_us-gaap-StatementClassOfStockAxis_psb-CumulativePreferredStockSeriesZMember"> PSBPrZ </dei:TradingSymbol> |
| <dei:SecurityExchangeName contextRef="duration_2022-07-20_to_2022-07-20_us-gaap-StatementClassOfStockAxis_psb-CumulativePreferredStockSeriesZMember"> NYSE </dei:SecurityExchangeName> |
| <dei:EntityEmergingGrowthCompany contextRef="duration_2022-07-20_to_2022-07-20"> false </dei:EntityEmergingGrowthCompany> |
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