Basis Of Presentation And Summary Of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2013

Accounting Policies [Abstract]

Revision of prior period amounts for Montvale Center [Table Text Block]

The table below reflects selected information for the Company for the three and six months ended June 30, 2012. The servicer of the non-recourse mortgage loan in the amount of $25.0 million collateralized by the Company's Montvale Center property located in Gaithersburg, Maryland foreclosed on the property on January 31, 2012. As a result of the foreclosure, the Company recognized a gain on forgiveness of debt during the six months ended June 30, 2012 totaling approximately $17.8 million. Due to a procedural error of the trustee, the foreclosure sale was subsequently dismissed by the applicable court prior to ratification. As a result, the Company, as part of its 2012 Form 10-K filing, revised its financial statements to (1) properly reflect the property and related mortgage debt on its consolidated balance sheet at December 31, 2012, (2) reverse the gain on forgiveness of debt during the six months ended June 30, 2012 and (3) recognize the operating activity from the property for the three and six months ended June 30, 2012. On February 20, 2013, the subsequent foreclosure sale of Montvale Center was ratified by the court. As a result of the ratification, the mortgage loan totaling $25.0 million was extinguished and the related obligations were satisfied with the transfer of the real estate resulting in the recognition of a gain on forgiveness of debt totaling approximately $20.2 million during the six months ended June 30, 2013 (See Note 3). As a result, for the three and six months ended June 30, 2012, the activity for Montvale Center has been reclassified to discontinued operations in the consolidated statements of operations. In addition, operating results have been reclassified for the three and six months ended June 30, 2012 as a result of the discontinued operations presentation of (1) the Company's Bedford Business Park properties which were sold on May 17, 2012 and (2) the Company's 303 Almaden Boulevard property which was sold on June 28, 2013 (See Note 3).

	For the three months ended June 30, 2012				For the six months ended June 30, 2012
	As Reported		As Revised		As Reported		As Revised
	(in thousands, except for per share amounts)
Total revenue	$	472,897	$	471,349	$	918,124	$	915,042
Income from continuing operations	$	97,471	$	97,079	$	153,188	$	152,344
Discontinued operations	$	37,275	$	37,095	$	55,568	$	37,665
Net income attributable to Boston Properties, Inc. common shareholders	$	119,070	$	118,559	$	183,672	$	166,971
Income attributable to Boston Properties, Inc. common shareholders per share—basic	$	0.79	$	0.79	$	1.23	$	1.12
Income attributable to Boston Properties, Inc. common shareholders per share—diluted	$	0.79	$	0.78	$	1.23	$	1.12

Carrying Value Of Indebtedness And Corresponding Estimate Of Fair Value

The following table presents the aggregate carrying value of the Company’s indebtedness and the Company’s corresponding estimate of fair value as of June 30, 2013 and December 31, 2012 (in thousands):

	June 30, 2013					December 31, 2012
	Carrying Amount			Estimated Fair Value		Carrying Amount			Estimated Fair Value
Mortgage notes payable	$	4,484,657		$	4,598,927	$	3,102,485		$	3,256,940
Mezzanine notes payable	311,637			311,665		—			—
Unsecured senior notes	5,834,973			6,093,237		4,639,528			5,162,486
Unsecured exchangeable senior notes	734,278		(1)	772,691		1,170,356		(1)	1,278,554
Total	$	11,365,545		$	11,776,520	$	8,912,369		$	9,697,980

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(1) Includes the net adjustment for the equity component allocation totaling approximately $12.3 million and $25.5 million at June 30, 2013 and December 31, 2012, respectively.