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Segment Reporting
 12 Months Ended
Dec. 31, 2013
Segment Reporting [Abstract]  
Segment Reporting
Segment Reporting

Segment information is prepared on the same basis that we review information for operational decision-making purposes.  We operate in two business segments: (i) the acquisition, redevelopment, ownership and management of office real estate and (ii) the acquisition, redevelopment, ownership and management of multifamily real estate.  The services for our office segment primarily include rental of office space and other tenant services, including parking and storage space rental.  The services for our multifamily segment include rental of apartments and other tenant services, including parking and storage space rental.

Asset information by segment is not reported because we do not use this measure to assess performance or make decisions to allocate resources.  Therefore, depreciation and amortization expense is not allocated among segments.  General and administrative expenses and interest expense are not included in segment profit as our internal reporting addresses these items on a corporate level.

Segment profit is not a measure of operating income or cash flows from operating activities as measured by GAAP, and it is not indicative of cash available to fund cash needs and should not be considered an alternative to cash flows as a measure of liquidity.  Not all companies may calculate segment profit in the same manner.  We consider segment profit to be an appropriate supplemental measure to net income because it can assist both investors and management in understanding the core operations of our properties.
    
The table below (in thousands) presents the operating activity of our reportable segments:
 
Year Ended December 31,
 
2013
 
2012
 
2011
Office Segment
 
 
 
 
 
Rental revenue
$
514,600

 
$
505,276

 
$
505,077

Rental expense
(174,952
)
 
(170,725
)
 
(168,869
)
Segment profit
339,648

 
334,551

 
336,208

 
 
 
 
 
 
Multifamily Segment
 
 
 
 
 
Rental revenue
76,936

 
73,723

 
70,260

Rental expense
(19,928
)
 
(19,672
)
 
(19,012
)
Segment profit
57,008

 
54,051

 
51,248

 
 
 
 
 
 
Total profit from all segments
$
396,656

 
$
388,602

 
$
387,456



The table below (in thousands) is a reconciliation of the total profit from all segments to net income attributable to common stockholders:
 
Year Ended December 31,
 
2013
 
2012
 
2011
Total profit from all segments
$
396,656

 
$
388,602

 
$
387,456

General and administrative expenses
(26,614
)
 
(27,943
)
 
(29,286
)
Depreciation and amortization
(191,351
)
 
(184,849
)
 
(205,696
)
Other income
6,402

 
2,821

 
3,179

Other expenses
(4,199
)
 
(1,883
)
 
(2,073
)
Income (loss), including depreciation, from unconsolidated real estate funds
3,098

 
(1,710
)
 
(2,867
)
Interest expense
(130,548
)
 
(146,693
)
 
(148,455
)
Acquisition-related expenses
(607
)
 
—

 
—

Net income
52,837

 
28,345

 
2,258

Less: Net income attributable to noncontrolling interests
(7,526
)
 
(5,403
)
 
(807
)
Net income attributable to common stockholders
$
45,311

 
$
22,942

 
$
1,451