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Segment Reporting
12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Segment Reporting Segment ReportingThe Company’s reporting segments are based on the Company’s method of internal reporting, which classifies its operations into two reporting segments: (i) office properties and (ii) studio properties. The Company evaluates performance based upon net operating income of the combined properties in each segment. General and administrative expenses and interest expense are not included in segment profit as our internal reporting addresses these items on a corporate level. Asset information by segment is not reported because the Company does not use this measure to assess performance or make decisions to allocate resources, therefore, depreciation and amortization expense is not allocated among segments. 
The table below presents the operating activity of our reportable segments:
Year Ended December 31, 
2018 2017 2016 
Office segment 
Total office revenues $652,517 $667,110 $593,236 
Office expenses (226,820)(218,873)(202,935)
Office segment profit 425,697 448,237 390,301 
Studio segment 
Total studio revenues 75,901 61,029 46,403 
Studio expenses (40,890)(34,634)(25,810)
Studio segment profit 35,011 26,395 20,593 
TOTAL SEGMENT PROFIT $460,708 $474,632 $410,894 
Total revenues $728,418 $728,139 $639,639 
Total segment expenses (267,710)(253,507)(228,745)
TOTAL SEGMENT PROFIT $460,708 $474,632 $410,894 

The table below is a reconciliation of the total profit from all segments to net income attributable to common stockholders:
Year Ended December 31, 
2018 2017 2016 
Total profit from all segments $460,708 $474,632 $410,894 
General and administrative (61,027)(54,459)(52,400)
Depreciation and amortization (251,003)(283,570)(269,087)
Interest expense (83,167)(90,037)(76,044)
Interest income1,718 97 260 
Unrealized gain on non-real estate investment928 — — 
Unrealized gain on ineffective portion of derivative instrument— (70)(1,436)
Transaction-related expenses(535)(598)(376)
Other income822 2,992 1,558 
Gains on sale of real estate43,337 45,574 30,389 
Net income 111,781 94,561 43,758