OTHER ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Prepaid Expenses and Other Assets
Condominium inventory	$ 78,696		$ 0
Straight-line rent	47,649		39,136
Prepaid expenses	16,142		11,731
Equipment, net of accumulated depreciation of $7.9 million and $6.9 million, respectively	15,961		16,955
Security and escrow deposits	15,632		16,949
Other	9,026		4,798
Tenant incentives and other receivables	8,880		8,482
TIF receivable	6,048		14,444
Federal income tax receivable	2,000		2,198
Interest rate swap derivative assets	1,288		4,470
Condominium receivables	0		158,516
Prepaid expenses and other assets, net	286,194		370,027
Accumulated depreciation on other equipment	7,900		6,900
Decrease in prepaid expenses and other assets	83,800
Decrease in condominium receivables	158,500
Increase in condominium inventory	78,700
Accounts Payable and Accrued Liabilities [Abstract]
Construction payables	270,450		217,838
Condominium deposit liabilities	228,658		55,975
Deferred income	48,156		53,337
Accounts payable and accrued expenses	32,578		35,887
Accrued payroll and other employee liabilities	29,661		41,236
Accrued real estate taxes	26,541		22,289
Other	22,728		34,699
Tenant and other deposits	20,975		18,937
Straight-line ground rent liability	16,282		14,944
Accrued interest	8,086		20,322
Interest rate swap derivative liabilities	1,749		5,961
Above-market ground leases	0		293
Accounts payable and accrued expenses	705,864		521,718
Increase in accounts payable and accrued expenses	184,100
Increase in condominium deposits liability	172,700
Increase in construction payables	52,600
Leases, Acquired-in-Place
Prepaid Expenses and Other Assets
Intangibles	34,125		34,802
Net carrying amount	7,436		10,821
Ground Leases below Market
Prepaid Expenses and Other Assets
Special Improvement District receivable	23,747		26,430
Net carrying amount	18,381		18,647
Ground Leases above Market
Prepaid Expenses and Other Assets
Net carrying amount	1,183		$ 1,648
Impact of Adoption of ASC Topic 606 | Accounting Standards Update 2014-09
Prepaid Expenses and Other Assets
Condominium receivables	99,600	$ (154,200)
Prepaid expenses and other assets, net	(471,318)	5,600
Accounts Payable and Accrued Liabilities [Abstract]
Accounts payable and accrued expenses	99,600
Accounts payable and accrued expenses	$ 143,436	$ 95,000