| Document and Entity Information | Jul. 20, 2022 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Jul. 20, 2022 |
| Entity Registrant Name | PS BUSINESS PARKS, INC./MD |
| Entity Incorporation, State or Country Code | MD |
| Entity File Number | 001-10709 |
| Entity Tax Identification Number | 95-4300881 |
| Entity Address, Address Line One | 345 Park Avenue |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10154 |
| City Area Code | 212 |
| Local Phone Number | 583-5000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Current Fiscal Year End Date | --12-31 |
| Amendment Flag | false |
| Entity Central Index Key | 0000866368 |
| Former Address [Member] | |
| Entity Information [Line Items] | |
| 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 |
| Common Stock, $0.01 par value per share [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Common Stock, $0.01 par value per share |
| Trading Symbol | PSB |
| Security Exchange Name | NYSE |
| Depositary Shares Each Representing 1/1,000 of a 5.250% Cum Pref Share, Series X, $0.01 par value [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Depositary Shares Each Representing 1/1,000 of a 5.250% Cum Pref Share, Series X, $0.01 par value |
| Trading Symbol | PSBPrX |
| Security Exchange Name | NYSE |
| Depositary Shares Each Representing 1/1,000 of a 5.250% Cum Pref Share, Series X, $0.01 par value [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Depositary Shares Each Representing 1/1,000 of a 5.200% Cum Pref Share, Series Y, $0.01 par value |
| Trading Symbol | PSBPrY |
| Security Exchange Name | NYSE |
| Depositary Shares Each Representing 1/1,000 of a 4.875% Cum Pref Share, Series Z, $0.01 par value [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Depositary Shares Each Representing 1/1,000 of a 4.875% Cum Pref Share, Series Z, $0.01 par value |
| Trading Symbol | PSBPrZ |
| Security Exchange Name | NYSE |
