Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Consolidated Statements Of Income [Abstract]
Rental income	$ 103,760	$ 108,064	$ 310,535	$ 323,671
Expenses
Cost of operations	32,096	32,468	93,490	97,521
Depreciation and amortization	23,064	26,220	72,646	75,863
General and administrative	5,047	4,051	11,374	10,111
Total operating expenses	60,207	62,739	177,510	183,495
Interest and other income	230	1,384	1,012	2,766
Interest and other expense	(536)	(199)	(900)	(484)
Gain on sale of real estate facilities	7,652		27,273
Net income	50,899	46,510	160,410	142,458
Allocation to noncontrolling interests	(8,124)	(7,020)	(26,011)	(21,670)
Net income allocable to PS Business Parks, Inc.	42,775	39,490	134,399	120,788
Allocation to preferred shareholders	(12,046)	(12,959)	(36,139)	(38,877)
Allocation to restricted stock unit holders	(149)	(219)	(543)	(699)
Net income allocable to common shareholders	$ 30,580	$ 26,312	$ 97,717	$ 81,212
Net income per common share
Basic	$ 1.11	$ 0.96	$ 3.56	$ 2.96
Diluted	$ 1.11	$ 0.96	$ 3.55	$ 2.95
Weighted average common shares outstanding
Basic	27,483	27,432	27,470	27,411
Diluted	27,565	27,543	27,560	27,512