Noncontrolling Interests (Tables)

9 Months Ended

Sep. 30, 2018

Noncontrolling Interest [Line Items]

Distributions Declared to OP, LTIP, OPP and MYLTIP Units [Table Text Block]

The following table presents Boston Properties, Inc.’s dividends per share and Boston Properties Limited Partnership’s distributions per OP Unit and LTIP Unit paid in 2018:

Record Date	Payment Date	Dividend (Per Share)		Distribution (Per Unit)
September 28, 2018	October 31, 2018		$0.95		$0.95
June 29, 2018	July 31, 2018		$0.80		$0.80
March 29, 2018	April 30, 2018		$0.80		$0.80
December 29, 2017	January 30, 2018		$0.80		$0.80

Schedule Of Noncontrolling Interest Common Units [Table Text Block]

The following table reflects the activity of noncontrolling interests—redeemable partnership units of Boston Properties Limited Partnership for the nine months ended September 30, 2018 and 2017 (in thousands):

Balance at December 31, 2017	$	2,292,263
Contributions	34,970
Net income	49,128
Distributions	(45,730		)
Conversion of redeemable partnership units	(2,112		)
Unearned compensation	(5,754		)
Cumulative effect of a change in accounting principle	563
Other comprehensive income	599
Adjustment to reflect redeemable partnership units at redemption value	(133,263		)
Balance at September 30, 2018	$	2,190,664
Balance at December 31, 2016	$	2,262,040
Contributions	31,465
Net income	40,350
Distributions	(40,292		)
Conversion of redeemable partnership units	(16,812		)
Unearned compensation	(5,194		)
Cumulative effect of a change in accounting principle	(1,763		)
Other comprehensive income	52
Adjustment to reflect redeemable partnership units at redemption value	(103,556		)
Balance at September 30, 2017	$	2,166,290

Schedule Of Noncontrolling Interest Property Partnerships [Table Text Block]

The following table reflects the activity of the noncontrolling interests—property partnerships for the nine months ended September 30, 2018 and 2017 (in thousands):

Balance at December 31, 2017	$	1,683,760
Capital contributions	37,148
Net income	46,484
Accumulated other comprehensive income	432
Distributions	(56,796		)
Balance at September 30, 2018	$	1,711,028
Balance at December 31, 2016	$	1,530,647
Capital contributions	147,772
Net income	33,967
Accumulated other comprehensive loss	(2,272		)
Distributions	(41,439		)
Balance at September 30, 2017	$	1,668,675

Noncontrolling Interests [Member]

Noncontrolling Interest [Line Items]

Distributions Declared to OP, LTIP, OPP and MYLTIP Units [Table Text Block]

The following table presents Boston Properties Limited Partnership’s distributions on the OP Units and LTIP Units (including the 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units and, after the February 4, 2018 measurement date, the 2015 MYLTIP Units) and its distributions on the 2015 MYLTIP Units (prior to the February 4, 2018 measurement date), 2016 MYLTIP Units, 2017 MYLTIP Units and 2018 MYLTIP Units (after the February 6, 2018 issuance date) paid in 2018:

Record Date	Payment Date	Distributions per OP Unit and LTIP Unit		Distributions per MYLTIP Unit
September 28, 2018	October 31, 2018		$0.95		$0.095
June 29, 2018	July 31, 2018		$0.80		$0.080
March 29, 2018	April 30, 2018		$0.80		$0.080
December 29, 2017	January 30, 2018		$0.80		$0.080