Condensed Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Rental revenue	$ 122,311	$ 117,113
Tenant expense reimbursement	17,794	15,974
Observatory revenue	21,249	20,940
Lease termination fees	622	7,938
Third-party management and other fees	463	351
Other revenue and fees	6,057	2,638
Total revenues	168,496	164,954
Operating expenses:
Property operating expenses	44,185	42,210
Ground rent expenses	2,331	2,331
General and administrative expenses	12,628	11,088
Observatory expenses	7,336	7,255
Real estate taxes	26,744	24,558
Depreciation and amortization	39,883	40,846
Total operating expenses	133,107	128,288
Total operating income	35,389	36,666
Other expenses:
Interest expense	(17,591)	(17,742)
Loss from derivative financial instruments	0	(247)
Income before income taxes	17,798	18,677
Income tax benefit	260	468
Net income	18,058	19,145
Private perpetual preferred unit distributions	(234)	(234)
Net income attributable to non-controlling interests	(8,056)	(8,926)
Net income attributable to common stockholders	$ 9,768	$ 9,985
Total weighted average shares:
Basic (in shares)	162,667	156,493
Diluted (in shares)	296,827	297,962
Earnings per share attributable to common stockholders:
Basic (in USD per share)	$ 0.06	$ 0.06
Diluted (in USD per share)	0.06	0.06
Dividends per share (in USD per share)	$ 0.105	$ 0.105