Consolidated Statements Of Income (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues:
Rental income	$ 76,562	$ 69,773	$ 223,127	$ 205,853
Facility management fees	170	165	517	501
Total operating revenues	76,732	69,938	223,644	206,354
Expenses:
Cost of operations	24,884	22,743	74,805	66,960
Depreciation and amortization	21,423	21,093	63,200	57,731
General and administrative	1,365	1,831	4,683	6,980
Total operating expenses	47,672	45,667	142,688	131,671
Other income and expenses:
Interest and other income	37	60	174	260
Interest expense	(1,261)	(875)	(3,621)	(2,586)
Total other income and expenses	(1,224)	(815)	(3,447)	(2,326)
Income from continuing operations	27,836	23,456	77,509	72,357
Discontinued operations:
Income from discontinued operations	73	103	380	380
Gain on sale of real estate facility	2,717		2,717	5,153
Total discontinued operations	2,790	103	3,097	5,533
Net income	30,626	23,559	80,606	77,890
Net income allocable to noncontrolling interests:
Noncontrolling interests - common units	4,597	2,852	12,858	9,112
Noncontrolling interests - preferred units	99	984	(7,091)	4,118
Total net income allocable to noncontrolling interests	4,696	3,836	5,767	13,230
Net income allocable to PS Business Parks, Inc.:
Common shareholders	15,444	9,608	43,382	30,583
Preferred shareholders	10,450	10,080	31,349	33,958
Restricted stock unit holders	36	35	108	119
Total net income allocable to PS Business Parks, Inc.	25,930	19,723	74,839	64,660
Net income	$ 30,626	$ 23,559	$ 80,606	$ 77,890
Net income per common share - basic:
Continuing operations	$ 0.54	$ 0.39	$ 1.66	$ 1.07
Discontinued operations	$ 0.09		$ 0.10	$ 0.17
Net income	$ 0.63	$ 0.39	$ 1.76	$ 1.25
Net income per common share - diluted:
Continuing operations	$ 0.54	$ 0.39	$ 1.66	$ 1.07
Discontinued operations	$ 0.09		$ 0.10	$ 0.17
Net income	$ 0.63	$ 0.39	$ 1.75	$ 1.24
Weighted average common shares outstanding:
Basic	24,543	24,610	24,647	24,517
Diluted	24,612	24,740	24,738	24,663