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Noncontrolling Interest (Tables)
 12 Months Ended
Dec. 31, 2017
Noncontrolling Interest [Abstract]  
Schedule of Issued and Outstanding Common Shares

The following table presents the changes in Equity Commonwealth’s issued and outstanding common shares and units for the year ended December 31, 2017:
 
 
Common Shares
 
LTIP Units
 
Total
Outstanding at January 1, 2017
 
123,994,465

 
—

 
123,994,465

Restricted share, time-based LTIP Unit grants and vested restricted stock units, net of forfeitures
 
223,151

 
42,520

 
265,671

Outstanding at December 31, 2017
 
124,217,616

 
42,520

 
124,260,136

Noncontrolling ownership interest in the Operating Trust
 
 
 
 
 
0.03
%
Schedule of Issued and Outstanding Units
The following table presents the changes in Equity Commonwealth’s issued and outstanding common shares and units for the year ended December 31, 2017:
 
 
Common Shares
 
LTIP Units
 
Total
Outstanding at January 1, 2017
 
123,994,465

 
—

 
123,994,465

Restricted share, time-based LTIP Unit grants and vested restricted stock units, net of forfeitures
 
223,151

 
42,520

 
265,671

Outstanding at December 31, 2017
 
124,217,616

 
42,520

 
124,260,136

Noncontrolling ownership interest in the Operating Trust
 
 
 
 
 
0.03
%
The table below presents a summary of restricted share, RSU and LTIP Unit activity for the years ended December 31, 2017, 2016 and 2015:
 
Number
of
Restricted Shares and Time-Based LTIP Units
 
Weighted
Average
Grant Date
Fair Value
 
Number
of
RSUs and Market-Based LTIP Units
 
Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2014
710,182

 
$
26.66

 
1,266,237

 
$
15.99

Granted
160,906

 
26.46

 
639,250

 
15.47

Vested
(86,517
)
 
26.66

 
—

 
—

Forfeited
(8,115
)
 
26.64

 
(21,377
)
 
15.80

Outstanding at December 31, 2015
776,456

 
$
26.62

 
1,884,110

 
$
15.82

Granted
167,790

 
27.29

 
691,385

 
15.57

Vested
(191,498
)
 
26.54

 
—

 
—

Forfeited
(539
)
 
26.82

 
(2,727
)
 
15.54

Outstanding at December 31, 2016
752,209

 
$
26.79

 
2,572,768

 
$
15.75

Granted
144,192

 
31.51

 
585,967

 
15.97

Vested
(217,449
)
 
27.97

 
(226,258
)
 
15.99

Not earned(1)
—

 
—

 
(800,530
)
 
15.99

Outstanding at December 31, 2017
678,952

 
$
27.41

 
2,131,947

 
$
15.69


(1) The table presents the maximum number of shares issued or issuable from outstanding equity awards. RSUs and Market-based LTIP Units Not earned are the shares market-based award recipients do not receive based on the performance measurement completed at the end of the performance period.