Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Commercial real estate properties, at cost:
Land	$ 201,196	$ 201,196
Development costs	7,987	7,986
Building and improvements	2,616,772	2,458,473
Commercial real estate properties, at cost, gross	2,825,955	2,667,655
Less: accumulated depreciation	(718,959)	(656,900)
Commercial real estate properties, net	2,106,996	2,010,755
Cash and cash equivalents	229,745	464,344
Restricted cash	54,356	65,853
Short-term investments	400,000	0
Tenant and other receivables, net of allowance of $1,616 and $1,422 in 2018 and 2017, respectively	31,342	28,329
Deferred rent receivables, net of allowance of $22 and $185 in 2018 and 2017, respectively	195,455	178,629
Prepaid expenses and other assets	50,663	61,028
Deferred costs, net	244,441	262,701
Acquired below-market ground leases, net	362,355	368,229
Goodwill	491,479	491,479
Total assets	4,166,832	3,931,347
Liabilities:
Mortgage notes payable, net	609,299	717,164
Senior unsecured notes, net	1,045,362	707,895
Unsecured term loan facility, net	264,023	263,662
Unsecured revolving credit facility	0	0
Accounts payable and accrued expenses	128,340	110,849
Acquired below-market leases, net	55,662	66,047
Deferred revenue and other liabilities	32,175	40,907
Tenants’ security deposits	42,520	47,086
Total liabilities	2,177,381	1,953,610
Commitments and contingencies
Empire State Realty Trust, Inc. stockholders' equity:
Preferred stock	0	0
Additional paid-in capital	1,165,080	1,128,460
Accumulated other comprehensive loss	(2,229)	(8,555)
Retained earnings	37,004	46,762
Total Empire State Realty Trust, Inc.'s stockholders' equity	1,201,546	1,168,282
Non-controlling interests in operating partnership	779,901	801,451
Private perpetual preferred units, $16.62 per unit liquidation preference, 1,560,360 issued and outstanding in 2018 and 2017	8,004	8,004
Total equity	1,989,451	1,977,737
Total liabilities and equity	4,166,832	3,931,347
Class A Common Stock
Empire State Realty Trust, Inc. stockholders' equity:
Common stock	1,681	1,604
Class B Common Stock
Empire State Realty Trust, Inc. stockholders' equity:
Common stock	$ 10	$ 11