Consolidated Statements Of Income (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Rental income	$ 73,053	$ 69,432	$ 146,565	$ 136,080
Facility management fees	169	163	347	336
Total operating revenues	73,222	69,595	146,912	136,416
Expenses:
Cost of operations	24,213	21,476	49,921	44,217
Depreciation and amortization	21,023	18,560	41,777	36,638
General and administrative	1,748	2,400	3,318	5,149
Total operating expenses	46,984	42,436	95,016	86,004
Other income and expenses:
Interest and other income	43	91	137	200
Interest expense	(1,145)	(856)	(2,360)	(1,711)
Total other income and expenses	(1,102)	(765)	(2,223)	(1,511)
Income from continuing operations	25,136	26,394	49,673	48,901
Discontinued operations:
Income from discontinued operations	171	96	307	277
Gain on sale of real estate facility				5,153
Total discontinued operations	171	96	307	5,430
Net income	25,307	26,490	49,980	54,331
Net income allocable to noncontrolling interests:
Noncontrolling interests - common units	3,362	2,749	8,262	6,261
Noncontrolling interests - preferred units	100	1,752	(7,190)	3,134
Total net income allocable to noncontrolling interests	3,462	4,501	1,072	9,395
Net income allocable to PS Business Parks, Inc.:
Common shareholders	11,374	9,229	27,937	20,974
Preferred shareholders	10,449	12,723	20,899	23,878
Restricted stock unit holders	22	37	72	84
Total net income allocable to PS Business Parks, Inc.	21,845	21,989	48,908	44,936
Net income	$ 25,307	$ 26,490	$ 49,980	$ 54,331
Net income per common share - basic:
Continuing operations	$ 0.45	$ 0.37	$ 1.12	$ 0.69
Discontinued operations	$ 0.01		$ 0.01	$ 0.17
Net income	$ 0.46	$ 0.38	$ 1.13	$ 0.86
Net income per common share - diluted:
Continuing operations	$ 0.45	$ 0.37	$ 1.12	$ 0.68
Discontinued operations	$ 0.01		$ 0.01	$ 0.17
Net income	$ 0.46	$ 0.37	$ 1.13	$ 0.85
Weighted average common shares outstanding:
Basic	24,715	24,524	24,700	24,469
Diluted	24,807	24,669	24,800	24,611