Consolidated Statements of Operations (KILROY REALTY, L.P.) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
REVENUES:
Rental income	$ 83,452	$ 65,038	$ 163,742	$ 125,694
Tenant reimbursements	7,510	6,483	13,932	12,201
Other property income	1,102	895	2,515	1,340
Total revenues	92,064	72,416	180,189	139,235
EXPENSES:
Property expenses	17,583	14,543	35,272	26,563
Real estate taxes	8,413	6,482	16,582	12,518
Provision for bad debts	120	(12)	146	14
Ground leases (Note 11)	424	370	763	312
General and administrative expenses	7,440	6,728	14,000	13,823
Acquisition-related expenses	1,194	957	1,666	1,270
Depreciation and amortization	32,248	23,722	61,559	44,660
Total expenses	67,422	52,790	129,988	99,160
OTHER (EXPENSES) INCOME:
Interest income and other net investment gains (losses) (Note 12)	58	(18)	242	366
Interest expense (Note 5)	(21,228)	(13,088)	(42,104)	(25,044)
Loss on early extinguishment of debt		(4,564)		(4,564)
Total other (expenses) income	(21,170)	(17,670)	(41,862)	(29,242)
NET INCOME	3,472	1,956	8,339	10,833
NET INCOME ATTRIBUTABLE TO KILROY REALTY, L.P.	3,482	2,016	8,315	10,701
Preferred distributions and dividends	(3,799)	(3,799)	(7,598)	(7,598)
NET (LOSS) INCOME AVAILABLE TO COMMON STOCKHOLDERS	(317)	(1,783)	717	3,103
Net (loss) income available to common unitholders per unit-basic	$ (0.01)	$ (0.04)	$ 0.00	$ 0.05
Net (loss) income available to common unitholders per unit-diluted	$ (0.01)	$ (0.04)	$ 0.00	$ 0.05
Weighted average common units outstanding - basic (Note 15)	57,685,710	50,296,643	55,008,765	46,674,494
Weighted average common units outstanding - diluted (Note 15)	57,685,710	50,296,643	55,384,729	46,677,850
Kilroy Realty, L.P. [Member]
REVENUES:
Rental income	83,452	65,038	163,742	125,694
Tenant reimbursements	7,510	6,483	13,932	12,201
Other property income	1,102	895	2,515	1,340
Total revenues	92,064	72,416	180,189	139,235
EXPENSES:
Property expenses	17,583	14,543	35,272	26,563
Real estate taxes	8,413	6,482	16,582	12,518
Provision for bad debts	120	(12)	146	14
Ground leases (Note 11)	424	370	763	312
General and administrative expenses	7,440	6,728	14,000	13,823
Acquisition-related expenses	1,194	957	1,666	1,270
Depreciation and amortization	32,248	23,722	61,559	44,660
Total expenses	67,422	52,790	129,988	99,160
OTHER (EXPENSES) INCOME:
Interest income and other net investment gains (losses) (Note 12)	58	(18)	242	366
Interest expense (Note 5)	(21,228)	(13,088)	(42,104)	(25,044)
Loss on early extinguishment of debt		(4,564)		(4,564)
Total other (expenses) income	(21,170)	(17,670)	(41,862)	(29,242)
NET INCOME	3,472	1,956	8,339	10,833
Net income attributable to noncontrolling interests in consolidated subsidiaries	(32)	(51)	(65)	(96)
NET INCOME ATTRIBUTABLE TO KILROY REALTY, L.P.	3,440	1,905	8,274	10,737
Preferred distributions and dividends	(3,799)	(3,799)	(7,598)	(7,598)
NET (LOSS) INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ (359)	$ (1,894)	$ 676	$ 3,139
Net (loss) income available to common unitholders per unit-basic	$ (0.01)	$ (0.04)	$ 0.00	$ 0.05
Net (loss) income available to common unitholders per unit-diluted	$ (0.01)	$ (0.04)	$ 0.00	$ 0.05
Weighted average common units outstanding - basic (Note 15)	59,407,687	52,019,774	56,731,316	48,397,625
Weighted average common units outstanding - diluted (Note 15)	59,407,687	52,019,774	57,107,280	48,400,981
Distributions declared per common unit	$ 0.35	$ 0.35	$ 0.70	$ 0.70