Segment Disclosure (Tables)

12 Months Ended

Dec. 31, 2012

Reconciliation of Assets from Segment to Consolidated [Table Text Block]

The following table, which reconciles total segment assets to total consolidated assets, is presented solely for the purposes of showing the comparative information for our asset composition at December 31, 2012 and December 31, 2011.



	December 31,
	2012		2011
	(in thousands)
Assets:
Reportable Segment - Office Properties
Land, buildings, and improvements, net	$	3,191,225	$	2,480,338
Undeveloped land and construction in progress	809,654		430,806
Total assets⁽¹⁾	4,315,485		3,248,661
Non-Reportable Segment - Industrial Properties
Land, buildings, and improvements, net	—		145,043
Total assets⁽¹⁾	—		156,741
Total Segments
Land, buildings, and improvements, net	3,191,225		2,625,381
Undeveloped land and construction in progress	809,654		430,806
Total assets⁽¹⁾	4,315,485		3,405,402



Reconciliation to Consolidated Assets:
Total assets allocated to segments	4,315,485		3,405,402
Other unallocated assets:
Cash and cash equivalents	16,700		4,777
Restricted cash	247,544		358
Marketable securities	7,435		5,691
Deferred financing costs, net	18,971		18,368
Prepaid expenses and other assets, net	9,949		12,199
Total consolidated assets	$	4,616,084	$	3,446,795

_______________

(1) Includes land, buildings, and improvements, undeveloped land and construction in progress, real estate assets held for sale, current receivables, deferred rent receivables, deferred

leasing costs, and acquisition-related intangible assets, all shown on a net basis.

Schedule of Segment Reporting Expenditures for Acquisitions and Capital Expenditures [Table Text Block]



	December 31,
	2012		2011
	(in thousands)
Acquisitions and Capital Expenditures:⁽¹⁾
Reportable Segment - Office Properties
Expenditures for real estate acquisitions	$	1,087,489	$	663,483
Expenditures for development and redevelopment properties and undeveloped land	144,477		32,198
Expenditures for operating properties⁽²⁾	86,089		66,448
Non-Reportable Segment - Industrial Properties
Expenditures for operating properties⁽²⁾	1,131		6,001
Total Segments
Expenditures for real estate acquisitions	1,087,489		663,483
Expenditures for development and redevelopment properties and undeveloped land	144,477		32,198
Expenditures for operating properties⁽²⁾	87,220		72,449

_______________


(1)	Total consolidated acquisitions and capital expenditures are equal to the same amounts disclosed for total segments. Amounts represent balances on an accrual basis.


(2)	Includes expenditures for building improvements, tenant improvements, deferred leasing costs and acquisition-related intangible assets for our operating properties. Excludes acquisition-related intangible liabilities.