Summary of Significant Accounting Policies and Procedures and Recent Accounting Pronouncements (Tables)

12 Months Ended

Dec. 31, 2015

Summary of Significant Accounting Policies and Procedures and Recent Accounting Pronouncements

Schedule of reconciliation of the denominator of the basic net income per common share computation to the denominator of the diluted net income per common share computation

	2015	2014	2013
Weighted average shares used for the basic net income per share computation	235,767,932	218,390,885	191,754,857
Incremental shares from share-based compensation	123,436	59,978	26,765
Weighted average partnership common units convertible to common shares that were dilutive	317,022	317,022	-
Weighted average shares used for diluted net income per share computation	236,208,390	218,767,885	191,781,622
Unvested shares from share-based compensation that were anti-dilutive	106,103	51,749	59,629
Weighted average partnership common units convertible to common shares that were anti-dilutive	417,060	523,847	851,568

Estimated useful lives of properties

Buildings	25 years or 35 years
Building improvements	4 to 20 years
Tenant improvements and lease commissions	The shorter of the term of the related lease or useful life
Acquired in-place leases	Remaining terms of the respective leases