Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
REVENUES:
Rental income	$ 107,380	$ 84,349
Tenant reimbursements	9,887	7,180
Other property income	230	868
Total revenues	117,497	92,397
EXPENSES:
Property expenses	23,773	16,132
Real estate taxes	10,337	7,665
Provision for bad debts	95	2
Ground leases (Note 3)	847	807
General and administrative expenses	9,669	8,767
Acquisition-related expenses	655	1,528
Depreciation and amortization	50,391	34,652
Total expenses	95,767	69,553
OTHER (EXPENSES) INCOME:
Interest income and other net investment gains (Note 11)	392	484
Interest expense (Note 5)	(19,734)	(21,163)
Total other (expenses) income	(19,342)	(20,679)
NCOME FROM CONTINUING OPERATIONS	2,388	2,165
DISCONTINUED OPERATIONS
Income from discontinued operations	0	3,697
Net gain on dispositions of discontinued operations	0	72,809
Total income from discontinued operations	0	76,506
NET INCOME	2,388	78,671
Net loss (income) attributable to noncontrolling common units of the Operating Partnership	22	(1,795)
NET INCOME ATTRIBUTABLE TO KILROY REALTY CORPORATION	2,410	76,876
PREFERRED DISTRIBUTIONS AND DIVIDENDS:
Distributions to noncontrolling cumulative redeemable preferred units of the Operating Partnership	0	(1,397)
Preferred dividends	(3,313)	(3,021)
Original issuance costs of redeemed preferred stock and preferred units	0	(4,918)
Total preferred distributions and dividends	(3,313)	(9,336)
NET (LOSS) INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ (903)	$ 67,540
Loss from continuing operations available to common stockholders per common share-basic (Note 12)	$ (0.02)	$ (0.12)
Loss from continuing operations available to common stockholders per common share-diluted (Note 12)	$ (0.02)	$ (0.12)
Net (loss) income available to common stockholders per share-basic (Note 12)	$ (0.02)	$ 1.06
Net (loss) income available to common stockholders per share-diluted (Note 12)	$ (0.02)	$ 1.06
Weighted average common shares outstanding-basic (Note 12)	74,977,240	63,648,704
Weighted average common shares outstanding-diluted (Note 12)	74,977,240	63,648,704
Dividends declared per common share	$ 0.35	$ 0.35