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ACQUISITIONS AND DISPOSITIONS - Aggregate Purchase Price Allocations (Details) - USD ($) $ in Thousands	Sep. 30, 2017	May 25, 2017	May 24, 2017	Feb. 02, 2017	Jan. 17, 2017	Jan. 04, 2017
Business Acquisition [Line Items]
Debt Instrument, Unamortized Premium	$ (2,680)
Yonkers Gateway Center	141,234
Shops at Bruckner	333,338
Hudson Mall	114,670
Yonkers Gateway Center	(122,893)
Assets Acquired and Liabilities Assumed, Net	$ 463,669
The Plaza at Woodbridge
Business Acquisition [Line Items]
Debt Instrument, Unamortized Premium		$ 0
Yonkers Gateway Center		21,547
Shops at Bruckner		75,017
Hudson Mall		11,596
Yonkers Gateway Center		(4,198)
Assets Acquired and Liabilities Assumed, Net		$ 103,962
21 E Broad St / One Lincoln Plaza
Business Acquisition [Line Items]
Debt Instrument, Unamortized Premium			$ 0
Yonkers Gateway Center			5,728
Shops at Bruckner			4,305
Hudson Mall			679
Yonkers Gateway Center			(554)
Assets Acquired and Liabilities Assumed, Net			10,158
Millburn Gateway Center
Business Acquisition [Line Items]
Debt Instrument, Unamortized Premium			0
Yonkers Gateway Center			15,783
Shops at Bruckner			25,387
Hudson Mall			5,360
Yonkers Gateway Center			(947)
Assets Acquired and Liabilities Assumed, Net			45,583
Manchester Plaza
Business Acquisition [Line Items]
Debt Instrument, Unamortized Premium			0
Yonkers Gateway Center			4,409
Shops at Bruckner			13,756
Hudson Mall			3,256
Yonkers Gateway Center			(1,259)
Assets Acquired and Liabilities Assumed, Net			20,162
The Plaza at Cherry Hill
Business Acquisition [Line Items]
Debt Instrument, Unamortized Premium			0
Yonkers Gateway Center			14,602
Shops at Bruckner			33,666
Hudson Mall			7,800
Yonkers Gateway Center			(2,533)
Assets Acquired and Liabilities Assumed, Net			53,535
Yonkers Gateway Center
Business Acquisition [Line Items]
Debt Instrument, Unamortized Premium						$ 0
Yonkers Gateway Center						40,699
Shops at Bruckner						0
Hudson Mall						25,858
Yonkers Gateway Center						(14,655)
Assets Acquired and Liabilities Assumed, Net						$ 51,902
Shops at Bruckner
Business Acquisition [Line Items]
Debt Instrument, Unamortized Premium					$ (30)
Yonkers Gateway Center					0
Shops at Bruckner					32,979
Hudson Mall					12,029
Yonkers Gateway Center					(12,709)
Assets Acquired and Liabilities Assumed, Net					$ 32,269
Hudson Mall
Business Acquisition [Line Items]
Debt Instrument, Unamortized Premium				$ (1,730)
Yonkers Gateway Center				15,824
Shops at Bruckner				37,593
Hudson Mall				9,930
Yonkers Gateway Center				(17,344)
Assets Acquired and Liabilities Assumed, Net				$ 44,273
Ackerman Portfolio
Business Acquisition [Line Items]
Debt Instrument, Unamortized Premium			(920)
Yonkers Gateway Center			22,642
Shops at Bruckner			110,635
Hudson Mall			38,162
Yonkers Gateway Center			(68,694)
Yonkers Gateway Center (Ackerman) [Member]
Business Acquisition [Line Items]
Assets Acquired and Liabilities Assumed, Net			$ 101,825

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