10. Earnings Per Share / Common Unit

Boston Properties, Inc.

The following table provides a reconciliation of both the net income attributable to Boston Properties, Inc. common shareholders and the number of common shares used in the computation of basic earnings per share (“EPS”), which is calculated by dividing net income attributable to Boston Properties, Inc. common shareholders by the weighted-average number of common shares outstanding during the period. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are also participating securities. As such, unvested restricted common stock of the Company, LTIP Units, 2012 OPP Units and MYLTIP Units are considered participating securities. Participating securities are included in the computation of basic EPS of the Company using the two-class method. Participating securities are included in the computation of diluted EPS of the Company using the if-converted method if the impact is dilutive. Because the 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units required, and the 2015-2017 MYLTIP Units require, the Company to outperform absolute and relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, the Company excludes such units from the diluted EPS calculation. Other potentially dilutive common shares, including stock options, restricted stock and other securities of Boston Properties Limited Partnership that are exchangeable for the Boston Properties, Inc.’s Common Stock, and the related impact on earnings, are considered when calculating diluted EPS.



	Three months ended September 30, 2017
	Income (Numerator)			Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	117,337		154,355	$	0.76
Allocation of undistributed earnings to participating securities	(7		)	—	—
Net income attributable to Boston Properties, Inc. common shareholders	$	117,330		154,355	$	0.76
Effect of Dilutive Securities:
Stock Based Compensation	—			128	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	117,330		154,483	$	0.76

	Three months ended September 30, 2016
	Income (Numerator)			Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	76,753		153,754	$	0.50
Effect of Dilutive Securities:
Stock Based Compensation	—			382	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	76,753		154,136	$	0.50

	Nine months ended September 30, 2017
	Income (Numerator)			Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	348,086		154,132	$	2.26
Allocation of undistributed earnings to participating securities	(15		)	—	—
Net income attributable to Boston Properties, Inc. common shareholders	$	348,071		154,132	$	2.26
Effect of Dilutive Securities:
Stock Based Compensation	—			212	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	348,071		154,344	$	2.26



	Nine months ended September 30, 2016
	Income (Numerator)			Shares (Denominator)	Per Share Amount
	(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	355,114		153,681	$	2.31
Allocation of undistributed earnings to participating securities	(189		)	—	—
Net income attributable to Boston Properties, Inc. common shareholders	$	354,925		153,681	$	2.31
Effect of Dilutive Securities:
Stock Based Compensation	—			290	—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders	$	354,925		153,971	$	2.31

Boston Properties Limited Partnership

The following table provides a reconciliation of both the net income attributable to Boston Properties Limited Partnership common unitholders and the number of common units used in the computation of basic earnings per common unit, which is calculated by dividing net income attributable to Boston Properties Limited Partnership common unitholders by the weighted-average number of common units outstanding during the period. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are also participating securities. As such, unvested restricted common stock of Boston Properties, Inc. and Boston Properties Limited Partnership’s LTIP Units, 2012 OPP Units and MYLTIP Units are considered participating securities. Participating securities are included in the computation of basic earnings per common unit using the two-class method. Participating securities are included in the computation of diluted earnings per common unit using the if-converted method if the impact is dilutive. Because the 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units required, and the 2015-2017 MYLTIP Units require, Boston Properties, Inc. to outperform absolute and relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, Boston Properties Limited Partnership excludes such units from the diluted earnings per common unit calculation. Other potentially dilutive common units and the related impact on earnings are considered when calculating diluted earnings per common unit. Included in the number of units (the denominator) below are approximately 17,336,000 and 17,625,000 redeemable common units for the three months ended September 30, 2017 and 2016, respectively, and 17,517,000 and 17,672,000 redeemable common units for the nine months ended September 30, 2017 and 2016, respectively.



	Three months ended September 30, 2017
	Income (Numerator)			Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	132,693		171,691	$	0.77
Allocation of undistributed earnings to participating securities	(8		)	—	—
Net income attributable to Boston Properties Limited Partnership common unitholders	$	132,685		171,691	$	0.77
Effect of Dilutive Securities:
Stock Based Compensation	—			128	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	132,685		171,819	$	0.77



	Three months ended September 30, 2016
	Income (Numerator)			Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	91,306		171,379	$	0.53
Effect of Dilutive Securities:
Stock Based Compensation	—			382	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	91,306		171,761	$	0.53

	Nine months ended September 30, 2017
	Income (Numerator)			Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	395,199		171,649	$	2.30
Allocation of undistributed earnings to participating securities	(17		)	—	—
Net income attributable to Boston Properties Limited Partnership common unitholders	$	395,182		171,649	$	2.30
Effect of Dilutive Securities:
Stock Based Compensation	—			212	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	395,182		171,861	$	2.30

	Nine months ended September 30, 2016
	Income (Numerator)			Units (Denominator)	Per Unit Amount
	(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	408,540		171,353	$	2.38
Allocation of undistributed earnings to participating securities	(210		)	—	—
Net income attributable to Boston Properties Limited Partnership common unitholders	$	408,330		171,353	$	2.38
Effect of Dilutive Securities:
Stock Based Compensation	—			290	—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders	$	408,330		171,643	$	2.38