Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REVENUES:
Rental income	$ 466,328	$ 411,899	$ 342,164
Tenant reimbursements	46,717	38,047	29,667
Other property income (Note 15 and 17)	8,680	7,165	1,487
Total revenues	521,725	457,111	373,318
EXPENSES:
Property expenses	100,514	94,115	73,998
Real estate taxes	45,197	39,417	31,562
Provision for bad debts	58	396	153
Ground leases (Note 4 and 15)	3,075	3,504	3,168
General and administrative expenses	46,152	39,660	36,188
Acquisition-related expenses	1,479	1,962	4,937
Depreciation and amortization (Notes 2 and 4)	202,417	188,887	150,521
Total expenses	398,892	367,941	300,527
OTHER (EXPENSES) INCOME:
Interest income and other net investment gains (Note 16)	561	1,635	848
Interest expense (Note 7)	(67,571)	(75,870)	(79,114)
Total other (expenses) income	(67,010)	(74,235)	(78,266)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE GAIN ON SALE OF LAND	55,823	14,935	(5,475)
Gain on sale of land (Note 18)	3,490	0	0
INCOME (LOSS) FROM CONTINUING OPERATIONS	59,313	14,935	(5,475)
DISCONTINUED OPERATIONS (Note 18)
Income from discontinued operations	2,573	17,378	23,331
Net gain on dispositions of discontinued operations (Note 18)	121,922	12,252	259,245
Total income from discontinued operations	124,495	29,630	282,576
NET INCOME	183,808	44,565	277,101
Net income attributable to noncontrolling common units of the Operating Partnership	3,589	685	6,187
NET INCOME ATTRIBUTABLE TO KILROY REALTY	180,219	43,880	270,914
PREFERRED DISTRIBUTIONS AND DIVIDENDS:
Distributions to noncontrolling cumulative redeemable preferred units of the Operating Partnership (Note 9)	0	0	(3,541)
Preferred dividends (Note 10)	(13,250)	(13,250)	(10,567)
Original issuance costs of redeemed preferred stock and preferred units (Notes 9 and 11)	0	0	(6,980)
Total preferred distributions	(13,250)	(13,250)	(21,088)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 166,969	$ 30,630	$ 249,826
Income (loss) from continuing operations available to common stockholders per share of common stock – basic (Note 19)	$ 0.52	$ 0.00	$ (0.40)
Income (loss) from continuing operations available to common stockholders per share (dollars per share)	$ 0.51	$ 0.00	$ (0.40)
Net income available to common stockholders per share-basic (Note 19)	$ 1.99	$ 0.37	$ 3.56
Net income available to common stockholders per share-diluted (Note 19)	$ 1.95	$ 0.37	$ 3.56
Weighted average common shares outstanding-basic (Note 19)	83,090,235	77,343,853	69,639,623
Weighted average common shares outstanding-diluted (Note 19)	84,967,720	77,343,853	69,639,623