CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
REVENUES
Rental income (Note 8)	$ 218,633	$ 199,382
Other property income	2,695	1,820
Total revenues	221,328	201,202
EXPENSES
Property expenses	38,983	38,149
Real estate taxes	22,202	18,639
Ground leases (Note 9)	2,317	1,972
General and administrative expenses	19,010	23,341
Leasing costs	1,456	1,757
Depreciation and amortization	74,370	66,135
Total expenses	158,338	149,993
OTHER (EXPENSES) INCOME
Interest income and other net investment (loss) gain (Note 10)	(3,128)	1,828
Interest expense (Note 3)	(14,444)	(11,243)
Total other (expenses) income	(17,572)	(9,415)
NET INCOME	45,418	41,794
Net income attributable to noncontrolling common units of the Operating Partnership	(705)	(700)
Net income attributable to noncontrolling interests in consolidated property partnerships	(4,896)	(4,191)
Total income attributable to noncontrolling interests	(5,601)	(4,891)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS (UNITHOLDERS)	$ 39,817	$ 36,903
Net income available to common stockholders per share – basic (in dollars per share)	$ 0.37	$ 0.36
Net income available to common stockholders per share – diluted (in dollars per share)	$ 0.37	$ 0.36
Weighted average common shares outstanding – basic (in shares)	106,875,234	100,901,390
Weighted average common shares outstanding – diluted (in shares)	107,389,575	101,443,179
Kilroy Realty L.P. [Member]
REVENUES
Rental income (Note 8)	$ 218,633	$ 199,382
Other property income	2,695	1,820
Total revenues	221,328	201,202
EXPENSES
Property expenses	38,983	38,149
Real estate taxes	22,202	18,639
Ground leases (Note 9)	2,317	1,972
General and administrative expenses	19,010	23,341
Leasing costs	1,456	1,757
Depreciation and amortization	74,370	66,135
Total expenses	158,338	149,993
OTHER (EXPENSES) INCOME
Interest income and other net investment (loss) gain (Note 10)	(3,128)	1,828
Interest expense (Note 3)	(14,444)	(11,243)
Total other (expenses) income	(17,572)	(9,415)
NET INCOME	45,418	41,794
Total income attributable to noncontrolling interests	(5,029)	(4,286)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS (UNITHOLDERS)	$ 40,389	$ 37,508
Net income available to common stockholders per share – basic (in dollars per share)	$ 0.37	$ 0.36
Net income available to common stockholders per share – diluted (in dollars per share)	$ 0.36	$ 0.36
Weighted average common shares outstanding – basic (in shares)	108,897,027	102,925,166
Weighted average common shares outstanding – diluted (in shares)	109,411,368	103,466,955