Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

v3.20.4
Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 19, 2021
Jun. 30, 2020
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Transition Report false    
Entity File Number 1-10709    
Entity Registrant Name PS BUSINESS PARKS INC/CA    
Entity Incorporation, State or Country Code CA    
Entity Tax Identification Number 95-4300881    
Entity Address, Address Line One 701 Western Avenue    
Entity Address, City or Town Glendale    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 91201-2349    
City Area Code 818    
Local Phone Number 244-8080    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 2,651,598,115
Entity Common Stock, Shares Outstanding   27,488,684  
Documents Incorporated by Reference Portions of the definitive proxy statement to be filed in connection with the Annual Meeting of Shareholders to be held in 2021 are incorporated by reference into Part III of this Annual Report on Form 10-K.    
Amendment Flag false    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000866368    
Common Stock [Member]      
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol PSB    
Security Exchange Name NYSE    
Series W Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 5.200% Cum Pref Stock, Series W, $0.01 par value    
Trading Symbol PSBPrW    
Security Exchange Name NYSE    
Series X Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 5.250% Cum Pref Stock, Series X, $0.01 par value    
Trading Symbol PSBPrX    
Security Exchange Name NYSE    
Series Y Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 5.200% Cum Pref Stock, Series Y, $0.01 par value    
Trading Symbol PSBPrY    
Security Exchange Name NYSE    
Series Z Preferred Stock [Member]      
Title of 12(b) Security Depositary Shares Each Representing 1/1,000 of a 4.875% Cum Pref Stock, Series Z, $0.01 par value    
Trading Symbol PSBPrZ    
Security Exchange Name NYSE