Schedule III - Real Estate Assets and Accumulated Depreciation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended							12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended						12 Months Ended					12 Months Ended						12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended						12 Months Ended					12 Months Ended						12 Months Ended					12 Months Ended					12 Months Ended						12 Months Ended						12 Months Ended						12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended						12 Months Ended					12 Months Ended						12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended						12 Months Ended						12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended						12 Months Ended						12 Months Ended						12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended						12 Months Ended						12 Months Ended									12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended										12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009		Dec. 31, 2011 ENTERPRISE WAY 26200 [Member]	Dec. 31, 2011 ENTERPRISE WAY 26200 [Member] Minimum [Member] Year		Dec. 31, 2011 ENTERPRISE WAY 26200 [Member] Maximum [Member] Year		Dec. 31, 2011 DALLAS PARKWAY 3900 [Member]	Dec. 31, 2011 DALLAS PARKWAY 3900 [Member] Minimum [Member] Year		Dec. 31, 2011 DALLAS PARKWAY 3900 [Member] Maximum [Member] Year		Dec. 31, 2011 RIVER CORPORATE CENTER [Member]	Dec. 31, 2011 RIVER CORPORATE CENTER [Member] Minimum [Member] Year		Dec. 31, 2011 RIVER CORPORATE CENTER [Member] Maximum [Member] Year		Dec. 31, 2011 SOUTH PRICE ROAD 8700 [Member]	Dec. 31, 2011 SOUTH PRICE ROAD 8700 [Member] Minimum [Member] Year		Dec. 31, 2011 SOUTH PRICE ROAD 8700 [Member] Maximum [Member] Year		Dec. 31, 2011 1441 WEST LONG LAKE ROAD [Member]	Dec. 31, 2011 1441 WEST LONG LAKE ROAD [Member] Minimum [Member] Year		Dec. 31, 2011 1441 WEST LONG LAKE ROAD [Member] Maximum [Member] Year		Dec. 31, 2011 1111 DURHAM AVENUE [Member]	Dec. 31, 2011 1111 DURHAM AVENUE [Member] Minimum [Member] Year		Dec. 31, 2011 1111 DURHAM AVENUE [Member] Maximum [Member] Year		Dec. 31, 2011 ENCLAVE PARKWAY 1430 [Member]		Dec. 31, 2011 ENCLAVE PARKWAY 1430 [Member] Minimum [Member] Year		Dec. 31, 2011 ENCLAVE PARKWAY 1430 [Member] Maximum [Member] Year		Dec. 31, 2011 CRESCENT RIDGE II [Member]	Dec. 31, 2011 CRESCENT RIDGE II [Member] Minimum [Member] Year		Dec. 31, 2011 CRESCENT RIDGE II [Member] Maximum [Member] Year		Dec. 31, 2011 CROWN COLONY DRIVE 1200 [Member]		Dec. 31, 2011 CROWN COLONY DRIVE 1200 [Member] Minimum [Member] Year		Dec. 31, 2011 CROWN COLONY DRIVE 1200 [Member] Maximum [Member] Year		Dec. 31, 2011 HIATUS ROAD 5601 [Member]	Dec. 31, 2011 HIATUS ROAD 5601 [Member] Minimum [Member] Year		Dec. 31, 2011 HIATUS ROAD 5601 [Member] Maximum [Member] Year		Dec. 31, 2011 WINDY POINT I [Member]	Dec. 31, 2011 WINDY POINT I [Member] Minimum [Member] Year		Dec. 31, 2011 WINDY POINT I [Member] Maximum [Member] Year		Dec. 31, 2011 WINDY POINT II [Member]	Dec. 31, 2011 WINDY POINT II [Member] Minimum [Member] Year		Dec. 31, 2011 WINDY POINT II [Member] Maximum [Member] Year		Dec. 31, 2011 SARASOTA COMMERCE CENTER II [Member]	Dec. 31, 2011 SARASOTA COMMERCE CENTER II [Member] Minimum [Member] Year		Dec. 31, 2011 SARASOTA COMMERCE CENTER II [Member] Maximum [Member] Year		Dec. 31, 2011 JOHNS CREEK PARKWAY 11695 [Member]	Dec. 31, 2011 JOHNS CREEK PARKWAY 11695 [Member] Minimum [Member] Year		Dec. 31, 2011 JOHNS CREEK PARKWAY 11695 [Member] Maximum [Member] Year		Dec. 31, 2011 BROOKSIDE PARKWAY 3750 [Member]	Dec. 31, 2011 BROOKSIDE PARKWAY 3750 [Member] Minimum [Member] Year		Dec. 31, 2011 BROOKSIDE PARKWAY 3750 [Member] Maximum [Member] Year		Dec. 31, 2011 NW 64TH STREET 2001 [Member]	Dec. 31, 2011 NW 64TH STREET 2001 [Member] Minimum [Member] Year		Dec. 31, 2011 NW 64TH STREET 2001 [Member] Maximum [Member] Year		Dec. 31, 2011 CENTRAL STREET 90 [Member]	Dec. 31, 2011 CENTRAL STREET 90 [Member] Minimum [Member] Year		Dec. 31, 2011 CENTRAL STREET 90 [Member] Maximum [Member] Year		Dec. 31, 2011 DESERT CANYON 300 [Member]	Dec. 31, 2011 DESERT CANYON 300 [Member] Minimum [Member] Year		Dec. 31, 2011 DESERT CANYON 300 [Member] Maximum [Member] Year		Dec. 31, 2011 CONNECTION DRIVE 6031 [Member]	Dec. 31, 2011 CONNECTION DRIVE 6031 [Member] Minimum [Member] Year		Dec. 31, 2011 CONNECTION DRIVE 6031 [Member] Maximum [Member] Year		Dec. 31, 2011 CONNECTION DRIVE 6021 [Member]	Dec. 31, 2011 CONNECTION DRIVE 6021 [Member] Minimum [Member] Year		Dec. 31, 2011 CONNECTION DRIVE 6021 [Member] Maximum [Member] Year		Dec. 31, 2011 CONNECTION DRIVE 6011 [Member]	Dec. 31, 2011 CONNECTION DRIVE 6011 [Member] Minimum [Member] Year		Dec. 31, 2011 CONNECTION DRIVE 6011 [Member] Maximum [Member] Year		Dec. 31, 2011 BRAKER POINTE III [Member]		Dec. 31, 2011 BRAKER POINTE III [Member] Minimum [Member] Year		Dec. 31, 2011 BRAKER POINTE III [Member] Maximum [Member] Year		Dec. 31, 2011 CHANDLER FORUM [Member]	Dec. 31, 2011 CHANDLER FORUM [Member] Minimum [Member] Year		Dec. 31, 2011 CHANDLER FORUM [Member] Maximum [Member] Year		Dec. 31, 2011 GATEHALL DRIVE 2 [Member]		Dec. 31, 2011 GATEHALL DRIVE 2 [Member] Minimum [Member] Year		Dec. 31, 2011 GATEHALL DRIVE 2 [Member] Maximum [Member] Year		Dec. 31, 2011 SPECTRUM LOOP 350 [Member]	Dec. 31, 2011 SPECTRUM LOOP 350 [Member] Minimum [Member] Year		Dec. 31, 2011 SPECTRUM LOOP 350 [Member] Maximum [Member] Year		Dec. 31, 2011 HEADQUARTERS DRIVE 5601 [Member]	Dec. 31, 2011 HEADQUARTERS DRIVE 5601 [Member] Minimum [Member] Year		Dec. 31, 2011 HEADQUARTERS DRIVE 5601 [Member] Maximum [Member] Year		Dec. 31, 2011 TWO INDEPENDENCE SQUARE [Member]		Dec. 31, 2011 TWO INDEPENDENCE SQUARE [Member] Minimum [Member] Year		Dec. 31, 2011 TWO INDEPENDENCE SQUARE [Member] Maximum [Member] Year		Dec. 31, 2011 ONE INDEPENDENCE SQUARE [Member]		Dec. 31, 2011 ONE INDEPENDENCE SQUARE [Member] Minimum [Member] Year		Dec. 31, 2011 ONE INDEPENDENCE SQUARE [Member] Maximum [Member] Year		Dec. 31, 2011 WEST END AVENUE 2120 [Member]		Dec. 31, 2011 WEST END AVENUE 2120 [Member] Minimum [Member] Year		Dec. 31, 2011 WEST END AVENUE 2120 [Member] Maximum [Member] Year		Dec. 31, 2011 NORTH BRAND BOULEVARD 800 [Member]	Dec. 31, 2011 NORTH BRAND BOULEVARD 800 [Member] Minimum [Member] Year		Dec. 31, 2011 NORTH BRAND BOULEVARD 800 [Member] Maximum [Member] Year		Dec. 31, 2011 EASTPOINT I [Member]	Dec. 31, 2011 EASTPOINT I [Member] Minimum [Member] Year		Dec. 31, 2011 EASTPOINT I [Member] Maximum [Member] Year		Dec. 31, 2011 EASTPOINT II [Member]	Dec. 31, 2011 EASTPOINT II [Member] Minimum [Member] Year		Dec. 31, 2011 EASTPOINT II [Member] Maximum [Member] Year		Dec. 31, 2011 WEST JEFFERSON 150 [Member]	Dec. 31, 2011 WEST JEFFERSON 150 [Member] Minimum [Member] Year		Dec. 31, 2011 WEST JEFFERSON 150 [Member] Maximum [Member] Year		Dec. 31, 2011 US BANCORP CENTER [Member]	Dec. 31, 2011 US BANCORP CENTER [Member] Minimum [Member] Year		Dec. 31, 2011 US BANCORP CENTER [Member] Maximum [Member] Year		Dec. 31, 2011 AON CENTER [Member]	Dec. 31, 2011 AON CENTER [Member] Minimum [Member] Year		Dec. 31, 2011 AON CENTER [Member] Maximum [Member] Year		Dec. 31, 2011 AUBURN HILLS CORPORATE CENTER [Member]	Dec. 31, 2011 AUBURN HILLS CORPORATE CENTER [Member] Minimum [Member] Year		Dec. 31, 2011 AUBURN HILLS CORPORATE CENTER [Member] Maximum [Member] Year		Dec. 31, 2011 SUNSET HILLS ROAD 11107 [Member]	Dec. 31, 2011 SUNSET HILLS ROAD 11107 [Member] Minimum [Member] Year		Dec. 31, 2011 SUNSET HILLS ROAD 11107 [Member] Maximum [Member] Year		Dec. 31, 2011 SUNSET HILLS ROAD 11109 [Member]	Dec. 31, 2011 SUNSET HILLS ROAD 11109 [Member] Minimum [Member] Year		Dec. 31, 2011 SUNSET HILLS ROAD 11109 [Member] Maximum [Member] Year		Dec. 31, 2011 CORPORATE BOULEVARD 9211 [Member]	Dec. 31, 2011 CORPORATE BOULEVARD 9211 [Member] Minimum [Member] Year		Dec. 31, 2011 CORPORATE BOULEVARD 9211 [Member] Maximum [Member] Year		Dec. 31, 2011 CORPORATE BOULEVARD 9221 [Member]	Dec. 31, 2011 CORPORATE BOULEVARD 9221 [Member] Minimum [Member] Year		Dec. 31, 2011 CORPORATE BOULEVARD 9221 [Member] Maximum [Member] Year		Dec. 31, 2011 GLENRIDGE HIGHLANDS TWO [Member]	Dec. 31, 2011 GLENRIDGE HIGHLANDS TWO [Member] Minimum [Member] Year		Dec. 31, 2011 GLENRIDGE HIGHLANDS TWO [Member] Maximum [Member] Year		Dec. 31, 2011 BRIDGEWATER CROSSING 200 [Member]		Dec. 31, 2011 BRIDGEWATER CROSSING 200 [Member] Minimum [Member] Year		Dec. 31, 2011 BRIDGEWATER CROSSING 200 [Member] Maximum [Member] Year		Dec. 31, 2011 EAST COLORADO BOULEVARD 1055 [Member]	Dec. 31, 2011 EAST COLORADO BOULEVARD 1055 [Member] Minimum [Member] Year		Dec. 31, 2011 EAST COLORADO BOULEVARD 1055 [Member] Maximum [Member] Year		Dec. 31, 2011 FAIRWAY CENTER II [Member]		Dec. 31, 2011 FAIRWAY CENTER II [Member] Minimum [Member] Year		Dec. 31, 2011 FAIRWAY CENTER II [Member] Maximum [Member] Year		Dec. 31, 2011 COPPER RIDGE CENTER [Member]	Dec. 31, 2011 COPPER RIDGE CENTER [Member] Minimum [Member] Year		Dec. 31, 2011 COPPER RIDGE CENTER [Member] Maximum [Member] Year		Dec. 31, 2011 MAIN STREET 1901 [Member]	Dec. 31, 2011 MAIN STREET 1901 [Member] Minimum [Member] Year		Dec. 31, 2011 MAIN STREET 1901 [Member] Maximum [Member] Year		Dec. 31, 2011 RHEIN [Member]	Dec. 31, 2011 RHEIN [Member] Minimum [Member] Year		Dec. 31, 2011 RHEIN [Member] Maximum [Member] Year		Dec. 31, 2011 DESCHUTES [Member]	Dec. 31, 2011 DESCHUTES [Member] Minimum [Member] Year		Dec. 31, 2011 DESCHUTES [Member] Maximum [Member] Year		Dec. 31, 2011 WILLAMETTE [Member]	Dec. 31, 2011 WILLAMETTE [Member] Minimum [Member] Year		Dec. 31, 2011 WILLAMETTE [Member] Maximum [Member] Year		Dec. 31, 2011 ROGUE [Member]	Dec. 31, 2011 ROGUE [Member] Minimum [Member] Year		Dec. 31, 2011 ROGUE [Member] Maximum [Member] Year		Dec. 31, 2011 VIRGINIA AVE 400 [Member]	Dec. 31, 2011 VIRGINIA AVE 400 [Member] Minimum [Member] Year		Dec. 31, 2011 VIRGINIA AVE 400 [Member] Maximum [Member] Year		Dec. 31, 2011 NORTH FAIRFAX DRIVE 4250 [Member]	Dec. 31, 2011 NORTH FAIRFAX DRIVE 4250 [Member] Minimum [Member] Year		Dec. 31, 2011 NORTH FAIRFAX DRIVE 4250 [Member] Maximum [Member] Year		Dec. 31, 2011 EYE STREET 1225 [Member]		Dec. 31, 2011 EYE STREET 1225 [Member] Minimum [Member] Year		Dec. 31, 2011 EYE STREET 1225 [Member] Maximum [Member] Year		Dec. 31, 2011 EYE STREET 1201 [Member]		Dec. 31, 2011 EYE STREET 1201 [Member] Minimum [Member] Year		Dec. 31, 2011 EYE STREET 1201 [Member] Maximum [Member] Year		Dec. 31, 2011 MARKET STREET 1901 [Member]	Dec. 31, 2011 MARKET STREET 1901 [Member] Minimum [Member] Year		Dec. 31, 2011 MARKET STREET 1901 [Member] Maximum [Member] Year		Dec. 31, 2011 BROAD STREET 60 [Member]	Dec. 31, 2011 BROAD STREET 60 [Member] Minimum [Member] Year		Dec. 31, 2011 BROAD STREET 60 [Member] Maximum [Member] Year		Dec. 31, 2011 MASSACHUSETTS AVENUE 1414 [Member]	Dec. 31, 2011 MASSACHUSETTS AVENUE 1414 [Member] Minimum [Member] Year		Dec. 31, 2011 MASSACHUSETTS AVENUE 1414 [Member] Maximum [Member] Year		Dec. 31, 2011 ONE BRATTLE SQUARE [Member]	Dec. 31, 2011 ONE BRATTLE SQUARE [Member] Minimum [Member] Year		Dec. 31, 2011 ONE BRATTLE SQUARE [Member] Maximum [Member] Year		Dec. 31, 2011 CORPORATE DRIVE 600 [Member]	Dec. 31, 2011 CORPORATE DRIVE 600 [Member] Minimum [Member] Year		Dec. 31, 2011 CORPORATE DRIVE 600 [Member] Maximum [Member] Year		Dec. 31, 2011 WEST ENTRANCE DRIVE 1075 [Member]	Dec. 31, 2011 WEST ENTRANCE DRIVE 1075 [Member] Minimum [Member] Year		Dec. 31, 2011 WEST ENTRANCE DRIVE 1075 [Member] Maximum [Member] Year		Dec. 31, 2011 CLARENDON BOULEVARD 3100 [Member]	Dec. 31, 2011 CLARENDON BOULEVARD 3100 [Member] Minimum [Member] Year		Dec. 31, 2011 CLARENDON BOULEVARD 3100 [Member] Maximum [Member] Year		Dec. 31, 2011 CORPORATE BOULEVARD 9200 [Member]	Dec. 31, 2011 CORPORATE BOULEVARD 9200 [Member] Minimum [Member] Year		Dec. 31, 2011 CORPORATE BOULEVARD 9200 [Member] Maximum [Member] Year		Dec. 31, 2011 BRIDGEWATER CROSSING 400 [Member]		Dec. 31, 2011 BRIDGEWATER CROSSING 400 [Member] Minimum [Member] Year		Dec. 31, 2011 BRIDGEWATER CROSSING 400 [Member] Maximum [Member] Year		Dec. 31, 2011 LAS COLINAS CORPORATE CENTER I [Member]		Dec. 31, 2011 LAS COLINAS CORPORATE CENTER I [Member] Minimum [Member] Year		Dec. 31, 2011 LAS COLINAS CORPORATE CENTER I [Member] Maximum [Member] Year		Dec. 31, 2011 LAS COLINAS CORPORATE CENTER II [Member]		Dec. 31, 2011 LAS COLINAS CORPORATE CENTER II [Member] Minimum [Member] Year		Dec. 31, 2011 LAS COLINAS CORPORATE CENTER II [Member] Maximum [Member] Year		Dec. 31, 2011 TWO PIERCE PLACE [Member]	Dec. 31, 2011 TWO PIERCE PLACE [Member] Minimum [Member] Year		Dec. 31, 2011 TWO PIERCE PLACE [Member] Maximum [Member] Year		Dec. 31, 2011 CABOT DRIVE 2300 [Member]	Dec. 31, 2011 CABOT DRIVE 2300 [Member] Minimum [Member] Year		Dec. 31, 2011 CABOT DRIVE 2300 [Member] Maximum [Member] Year		Dec. 31, 2011 PIEDMONT POINTE I [Member]	Dec. 31, 2011 PIEDMONT POINTE I [Member] Minimum [Member] Year		Dec. 31, 2011 PIEDMONT POINTE I [Member] Maximum [Member] Year		Dec. 31, 2011 PIEDMONT POINTE II [Member]	Dec. 31, 2011 PIEDMONT POINTE II [Member] Minimum [Member] Year		Dec. 31, 2011 PIEDMONT POINTE II [Member] Maximum [Member] Year		Dec. 31, 2011 SUWANEE GATEWAY ONE [Member]	Dec. 31, 2011 SUWANEE GATEWAY ONE [Member] Minimum [Member] Year		Dec. 31, 2011 SUWANEE GATEWAY ONE [Member] Maximum [Member] Year		Dec. 31, 2011 ONE MERIDIAN CROSSINGS [Member]	Dec. 31, 2011 ONE MERIDIAN CROSSINGS [Member] Minimum [Member] Year		Dec. 31, 2011 ONE MERIDIAN CROSSINGS [Member] Maximum [Member] Year		Dec. 31, 2011 TWO MERIDIAN CROSSINGS [Member]	Dec. 31, 2011 TWO MERIDIAN CROSSINGS [Member] Minimum [Member] Year		Dec. 31, 2011 TWO MERIDIAN CROSSINGS [Member] Maximum [Member] Year		Dec. 31, 2011 ENCLAVE PARKWAY 1200 [Member]	Dec. 31, 2011 ENCLAVE PARKWAY 1200 [Member] Minimum [Member] Year		Dec. 31, 2011 ENCLAVE PARKWAY 1200 [Member] Maximum [Member] Year		Dec. 31, 2011 W MONROE 500 [Member]	Dec. 31, 2011 W MONROE 500 [Member] Minimum [Member] Year		Dec. 31, 2011 W MONROE 500 [Member] Maximum [Member] Year		Dec. 31, 2011 THE DUPREE [Member]	Dec. 31, 2011 THE DUPREE [Member] Minimum [Member] Year		Dec. 31, 2011 THE DUPREE [Member] Maximum [Member] Year		Dec. 31, 2011 THE MEDICI [Member]	Dec. 31, 2011 THE MEDICI [Member] Minimum [Member] Year		Dec. 31, 2011 THE MEDICI [Member] Maximum [Member] Year		Dec. 31, 2011 PRESIDENTIAL WAY 225 [Member]	Dec. 31, 2011 PRESIDENTIAL WAY 225 [Member] Minimum [Member] Year		Dec. 31, 2011 PRESIDENTIAL WAY 225 [Member] Maximum [Member] Year		Dec. 31, 2011 PRESIDENTIAL WAY 235 [Member]	Dec. 31, 2011 PRESIDENTIAL WAY 235 [Member] Minimum [Member] Year		Dec. 31, 2011 PRESIDENTIAL WAY 235 [Member] Maximum [Member] Year		Dec. 31, 2011 400 TOWNPARK [Member]	Dec. 31, 2011 400 TOWNPARK [Member] Minimum [Member] Year		Dec. 31, 2011 400 TOWNPARK [Member] Maximum [Member] Year		Dec. 31, 2011 HIDDEN LAKE CIRCLE 110 [Member]		Dec. 31, 2011 HIDDEN LAKE CIRCLE 110 [Member] Minimum [Member] Year		Dec. 31, 2011 HIDDEN LAKE CIRCLE 110 [Member] Maximum [Member] Year		Dec. 31, 2011 112 HIDDEN LAKE CIRCLE [Member]		Dec. 31, 2011 112 HIDDEN LAKE CIRCLE [Member] Minimum [Member] Year		Dec. 31, 2011 112 HIDDEN LAKE CIRCLE [Member] Maximum [Member] Year		Dec. 31, 2011 PIEDMONT POWER, LLC [Member]		Dec. 31, 2011 UNDEVELOPED LAND PARCELS [Member]		Dec. 31, 2011 Building 2020 [Member]	Dec. 31, 2011 Building 2020 [Member] Minimum [Member] Year		Dec. 31, 2011 Building 2020 [Member] Maximum [Member] Year		Dec. 31, 2011 INVESTMENT DRIVE 4685 [Member]	Dec. 31, 2011 INVESTMENT DRIVE 4685 [Member] Minimum [Member] Year		Dec. 31, 2011 INVESTMENT DRIVE 4685 [Member] Maximum [Member] Year		Dec. 31, 2011 MARYLAND WAY 5301 [Member]	Dec. 31, 2011 MARYLAND WAY 5301 [Member] Minimum [Member] Year		Dec. 31, 2011 MARYLAND WAY 5301 [Member] Maximum [Member] Year		Dec. 31, 2011 UPLAND DRIVE 8560 [Member]	Dec. 31, 2011 UPLAND DRIVE 8560 [Member] Minimum [Member] Year		Dec. 31, 2011 UPLAND DRIVE 8560 [Member] Maximum [Member] Year		Dec. 31, 2011 TWO PARK CENTER [Member]	Dec. 31, 2011 TWO PARK CENTER [Member] Minimum [Member] Year		Dec. 31, 2011 TWO PARK CENTER [Member] Maximum [Member] Year		Dec. 31, 2010 Interlocken Building 360 [Member]	Dec. 31, 2010 Interlocken Building 360 [Member] Fund IX, X, XI and REIT Joint Venture [Member]	Dec. 31, 2009 Kato Road 47300 Building [Member]	Dec. 31, 2009 Kato Road 47300 Building [Member] Wells Fremont Associates [Member]	Dec. 31, 2011 Secured Debt [Member] $350.0 Million Secured Pooled Facility [Member]		Dec. 31, 2011 Eye Street 1225 NW Associates LLC [Member]	Dec. 31, 2011 Eye Street 1225 NW Associates LLC [Member] 1225 Equity LLC [Member]	Dec. 31, 2011 Eye Street 1201 NW Associates LLC [Member]	Dec. 31, 2011 Eye Street 1201 NW Associates LLC [Member] 1201 Equity LLC [Member]	Dec. 31, 2011 Building Improvements [Member] Year	Dec. 31, 2011 Land Improvements [Member] Year	Dec. 31, 2011 Building [Member] Year	Dec. 31, 2011 Wholly Owned Properties [Member]	Dec. 31, 2011 Partially Owned Properties [Member]	May 31, 2010 Sylvan Avenue 111 Building [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage							100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%	[1]					100.00%					100.00%	[2]					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%	[2]					100.00%					100.00%	[2]					100.00%					100.00%					100.00%	[2]					100.00%	[2]					100.00%	[2]					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%	[2]					100.00%					100.00%	[2]					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					50.00%	[3]					50.00%	[4]					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%	[2]					100.00%	[1]					100.00%	[1]					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%					100.00%	[5]					100.00%	[5]					100.00%	[6]	100.00%	[1]	57.00%					55.00%					55.00%					72.00%					72.00%
Encumbrances																																					$ 32,100	[1]										$ 20,200	[2]										$ 23,400					$ 40,300																																																		$ 16,500	[2]										$ 42,700	[2]															$ 105,800	[2]					$ 57,800	[2]					$ 26,800	[2]																									$ 105,000					$ 225,000																																			$ 40,200	[2]					$ 29,200					$ 10,700	[2]																																								$ 45,000					$ 57,600	[3]					$ 82,400	[4]																																													$ 29,300	[2]					$ 17,500	[1]					$ 25,025	[1]																																													$ 140,000
Initial Cost, Land	621,331						4,577					1,456					0					0					2,160					9,653					7,100	[1]					7,700					11,042	[2]					3,642					4,537					3,746					1,767					2,080					1,561					0					3,642					2,602					3,157					3,157					3,157					6,098	[2]					2,632					9,054	[2]					2,185					3,153					52,711	[2]					29,765	[2]					4,908	[2]					23,605					1,485					1,235					9,759					11,138					23,267					1,978					2,711					1,218					3,019					3,019					6,662					8,182	[2]					6,495					7,110	[2]					6,974					6,246					1,015					1,072					1,085					1,546					22,146					13,636					21,959	[3]					31,985	[4]					13,584					32,522					4,210					6,974					3,934					5,200					11,700					3,730					10,400	[2]					3,912	[1]					4,496	[1]					4,370					4,390					11,200					13,300					1,000					2,919					2,661					3,460					36,990					4,080					1,780					3,626					4,154					2,570					1,002	[5]					663	[5]					0	[6]	6,021	[1]	1,696					2,144					4,300					1,954					600																		610,637	10,694
Initial Cost, Buildings and Improvements	3,960,632						0					20,377					16,036					13,272					16,776					20,495					37,915	[1]					45,154					40,666	[2]					10,404					31,847					55,026					20,533					13,572					14,207					7,172					29,497					24,333					43,656					42,662					29,034					34,492	[2]					0					96,722	[2]					24,964					24,602					202,702	[2]					104,814	[2]					59,011	[2]					136,284					11,064					9,199					88,364					175,629					472,488					16,570					17,890					8,038					21,984					21,984					69,031					84,160	[2]					30,265					15,600	[2]					38,714					36,455					6,425					6,361					6,211					7,630					49,740					70,918					47,602	[3]					63,139	[4]					166,683					168,986					35,821					64,940					0					22,957					69,705					16,608					71,052	[2]					18,830	[1]					29,881	[1]					70,632					19,549					58,606					70,618					6,875					24,398					25,742					15,047					185,113					14,310					11,510					36,916					44,048					20,555					15,709	[5]					10,914	[5]					79	[6]	427	[1]	7,851					9,984					20,702					11,216					22,682																		3,888,197	72,435
Initial Cost, Total	4,581,963						4,577					21,837					16,036					13,272					18,936					30,148					45,015	[1]					52,854					51,708	[2]					14,046					36,384					58,772					22,300					15,652					15,768					7,172					33,139					26,935					46,813					45,819					32,191					40,590	[2]					2,632					105,776	[2]					27,149					27,755					255,413	[2]					134,579	[2]					63,919	[2]					159,889					12,549					10,434					98,123					186,767					495,755					18,548					20,601					9,256					25,003					25,003					75,693					92,342	[2]					36,760					22,710	[2]					45,688					42,701					7,440					7,433					7,296					9,176					71,886					84,554					69,561	[3]					95,124	[4]					180,267					201,508					40,031					71,914					3,934					28,157					81,405					20,338					81,452	[2]					22,742	[1]					34,377	[1]					75,002					23,939					69,806					83,918					7,875					27,317					28,403					18,507					222,103					18,390					13,290					40,542					48,202					23,125					16,711	[5]					11,577	[5]					79	[6]	6,448	[1]	9,547					12,128					25,002					13,170					23,282																		4,498,834	83,129
Costs Capitalized Subsequent to Acquisition	117,348						10,419					2,602					683					550					(6,945)					(11,547)					3,742	[1]					7,523					148	[2]					650					1,838					100					2,001					1,636					126					447					2,618					304					2,505					1,397					2,586					1	[2]					19,912					158	[2]					(1,894)					4					5,820	[2]					2,770	[2]					6,671	[2]					7,545					156					1,836					3,956					5,885					93,857					(8,159)					3,665					(2,338)					(4,844)					(4,822)					(22,727)					(4,565)	[2]					(8,360)					(2,988)	[2]					(6,388)					(2,715)					(580)					(2,082)					(1,933)					0					(2,135)					5,082					3,150	[3]					2,790	[4]					137					(5,694)					1,988					(3,924)					16,281					(313)					(5,341)					(1,624)					3,237	[2]					(1,663)	[1]					(6,073)	[1]					611					(2,849)					5,527					2,310					78					(1)					14					66					50					71					194					(764)					(911)					0					1,276	[5]					840	[5]					818	[6]	2,523	[1]	(1,364)					2,902					1,355					542					(3,065)																		116,978	370
Gross Amount at Which Carried, Land	651,347						4,768					1,517					0					0					1,202					3,728					5,506	[1]					8,021					11,042	[2]					3,642					4,537					3,746					2,203					2,081					1,561					0					3,642					2,602					3,157					3,157					3,157					6,099	[2]					2,779					9,054	[2]					2,186					3,153					52,711	[2]					30,562	[2]					5,100	[2]					23,607					1,485					1,235					9,759					11,138					23,966					1,591					2,711					1,218					2,960					2,960					6,662					8,328	[2]					6,495					7,110	[2]					6,974					6,246					1,015					1,072					1,085					1,546					22,146					13,636					21,959	[3]					31,985	[4]					20,829					60,708					4,365					7,113					3,934					5,207					11,791					3,882					10,400	[2]					2,543	[1]					2,543	[1]					4,370					4,390					11,200					13,300					1,000					2,919					2,661					3,460					36,990					4,080					1,780					3,612					4,138					2,570					1,002	[5]					663	[5]					0	[6]	8,944	[1]	1,767					2,233					4,479					2,048					624																		640,196	11,151
Gross Amount at Which Carried, Buildings and Improvements	4,047,964						10,227					22,922					16,719					13,822					10,789					14,873					43,251	[1]					52,356					40,814	[2]					11,054					33,685					55,126					22,098					15,207					14,333					7,619					32,115					24,637					46,161					44,059					31,620					34,492	[2]					19,765					96,880	[2]					23,069					24,606					208,522	[2]					106,787	[2]					65,490	[2]					143,827					11,220					11,035					92,320					181,514					565,646					8,798					21,555					5,700					17,199					17,221					46,304					79,449	[2]					21,905					12,612	[2]					32,326					33,740					5,845					4,279					4,278					7,630					47,605					76,000					50,752	[3]					65,929	[4]					159,575					135,106					37,654					60,877					16,281					22,637					64,273					14,832					74,289	[2]					18,536	[1]					25,761	[1]					71,243					16,700					64,133					72,928					6,953					24,397					25,756					15,113					185,163					14,381					11,704					36,166					43,153					20,555					16,985	[5]					11,754	[5]					897	[6]	27	[1]	6,416					12,797					21,878					11,664					19,593																		3,975,616	72,348
Gross Amount at Which Carried, Total	4,699,311						14,996					24,439					16,719					13,822					11,991					18,601					48,757	[1]					60,377					51,856	[2]					14,696					38,222					58,872					24,301					17,288					15,894					7,619					35,757					27,239					49,318					47,216					34,777					40,591	[2]					22,544					105,934	[2]					25,255					27,759					261,233	[2]					137,349	[2]					70,590	[2]					167,434					12,705					12,270					102,079					192,652					589,612					10,389					24,266					6,918					20,159					20,181					52,966					87,777	[2]					28,400					19,722	[2]					39,300					39,986					6,860					5,351					5,363					9,176					69,751					89,636					72,711	[3]					97,914	[4]					180,404					195,814					42,019					67,990					20,215					27,844					76,064					18,714					84,689	[2]					21,079	[1]					28,304	[1]					75,613					21,090					75,333					86,228					7,953					27,316					28,417					18,573					222,153					18,461					13,484					39,778					47,291					23,125					17,987	[5]					12,417	[5]					897	[6]	8,971	[1]	8,183					15,030					26,357					13,712					20,217																		4,615,812	83,499
Accumulated Depreciation and Amortization	935,716		918,578		840,545		3,507					8,071					5,688					4,577					6,246					7,462					13,403	[1]					17,716					11,956	[2]					2,892					9,123					15,240					6,345					4,065					3,841					1,903					8,726					6,307					11,234					11,357					8,452					8,701	[2]					5,699					24,170	[2]					5,749					6,132					50,074	[2]					25,791	[2]					15,965	[2]					34,789					2,677					3,102					22,885					41,441					126,462					3,379					7,228					1,334					3,741					3,749					9,790					31,348	[2]					4,857					2,425	[2]					7,298					10,003					1,742					902					895					1,597					9,904					19,458					16,202	[3]					17,895	[4]					39,218					29,919					11,642					20,414					3,959					3,835					11,084					2,596					23,825	[2]					6,112	[1]					4,833	[1]					13,390					3,737					6,268					6,433					230					861					1,012					397					17,400					471					449					533					634					130					4,062	[5]					2,815	[5]					0	[6]	7	[1]	3,599					5,748					6,708					3,301					4,599																		911,761	23,955
Life on which Depreciation and Amortization is Computed								0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]			0	[7]	40	[7]		0	[7]	40	[7]			0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]			0	[7]	40	[7]		0	[7]	40	[7]			0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]			0	[7]	40	[7]			0	[7]	40	[7]			0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]			0	[7]	40	[7]		0	[7]	40	[7]			0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]			0	[7]	40	[7]			0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]			0	[7]	40	[7]			0	[7]	40	[7]			0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]			0	[7]	40	[7]			0	[7]	40	[7]						0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]		0	[7]	40	[7]
Impairment losses on real estate assets	0		0	[8]	35,063																																																																																																																																																																																																																																																																																																																																																																																																																																																																				53	1,400	2,600	3,300
Long Lived Assets Held-for-sale, Impairment Charge																																																																																																																																																																																																																																																																																																																																																																																																																																																																																								7,000
Debt Instrument, Face Amount																																																																																																																																																																																																																																																																																																																																																																																																																																																																													350,000
Interest Rate																																																																																																																																																																																																																																																																																																																																																																																																																																																																													4.84%	[10],[9]
Piedmont’s % Ownership of Entity																																																																																																																																																																																																																																																																																																																																																																																																																																																																															49.50%	49.50%	49.50%	49.50%
Property, Plant and Equipment, Useful Life, Minimum																																																																																																																																																																																																																																																																																																																																																																																																																																																																																			5	20
Property, Plant and Equipment, Useful Life, Maximum																																																																																																																																																																																																																																																																																																																																																																																																																																																																																			25	25
Property, Plant and Equipment, Useful Life, Average																																																																																																																																																																																																																																																																																																																																																																																																																																																																																					40
Real Estate:
Balance at the beginning of the year	4,666,188		4,681,313		4,739,791
Additions to/improvements of real estate	440,141		105,282		30,610
Assets disposed	(361,397)		(72,586)		0
Assets impaired	0		(8,489)	[11]	(38,379)	[12]
Write-offs of intangible assets	(35,916)	[13]	0	[13]	(2,340)	[13]
Write-offs of fully depreciated/amortized assets	(9,705)		(39,332)		(48,369)
Balance at the end of the year	4,699,311		4,666,188		4,681,313
Accumulated Depreciation and Amortization:
Balance at the beginning of the year	918,578		840,545		748,778		3,507					8,071					5,688					4,577					6,246					7,462					13,403	[1]					17,716					11,956	[2]					2,892					9,123					15,240					6,345					4,065					3,841					1,903					8,726					6,307					11,234					11,357					8,452					8,701	[2]					5,699					24,170	[2]					5,749					6,132					50,074	[2]					25,791	[2]					15,965	[2]					34,789					2,677					3,102					22,885					41,441					126,462					3,379					7,228					1,334					3,741					3,749					9,790					31,348	[2]					4,857					2,425	[2]					7,298					10,003					1,742					902					895					1,597					9,904					19,458					16,202	[3]					17,895	[4]					39,218					29,919					11,642					20,414					3,959					3,835					11,084					2,596					23,825	[2]					6,112	[1]					4,833	[1]					13,390					3,737					6,268					6,433					230					861					1,012					397					17,400					471					449					533					634					130					4,062	[5]					2,815	[5]					0	[6]	7	[1]	3,599					5,748					6,708					3,301					4,599																		911,761	23,955
Depreciation and amortization expense	147,440		131,000		140,136
Assets disposed	(84,681)		(13,519)		0
Write-offs of intangible assets	(35,916)	[13]	0	[13]	0	[13]
Write-offs of fully depreciated/amortized assets	(9,705)		(39,448)		(48,369)
Balance at the end of the year	$ 935,716		$ 918,578		$ 840,545		$ 3,507					$ 8,071					$ 5,688					$ 4,577					$ 6,246					$ 7,462					$ 13,403	[1]					$ 17,716					$ 11,956	[2]					$ 2,892					$ 9,123					$ 15,240					$ 6,345					$ 4,065					$ 3,841					$ 1,903					$ 8,726					$ 6,307					$ 11,234					$ 11,357					$ 8,452					$ 8,701	[2]					$ 5,699					$ 24,170	[2]					$ 5,749					$ 6,132					$ 50,074	[2]					$ 25,791	[2]					$ 15,965	[2]					$ 34,789					$ 2,677					$ 3,102					$ 22,885					$ 41,441					$ 126,462					$ 3,379					$ 7,228					$ 1,334					$ 3,741					$ 3,749					$ 9,790					$ 31,348	[2]					$ 4,857					$ 2,425	[2]					$ 7,298					$ 10,003					$ 1,742					$ 902					$ 895					$ 1,597					$ 9,904					$ 19,458					$ 16,202	[3]					$ 17,895	[4]					$ 39,218					$ 29,919					$ 11,642					$ 20,414					$ 3,959					$ 3,835					$ 11,084					$ 2,596					$ 23,825	[2]					$ 6,112	[1]					$ 4,833	[1]					$ 13,390					$ 3,737					$ 6,268					$ 6,433					$ 230					$ 861					$ 1,012					$ 397					$ 17,400					$ 471					$ 449					$ 533					$ 634					$ 130					$ 4,062	[5]					$ 2,815	[5]					$ 0	[6]	$ 7	[1]	$ 3,599					$ 5,748					$ 6,708					$ 3,301					$ 4,599																		$ 911,761	$ 23,955

[1] The acquisition of the property included excess, developable land, which has subsequently been reclassed into the asset class “Undeveloped Land Parcels”. Further, such Undeveloped Land Parcels are not included in Piedmont’s total building count.

[2] These properties collateralize the $350 Million Secured Pooled Facility with Morgan Stanley that accrues interest at 4.84% and matures in June 2014.

[3] Piedmont purchased all of the membership interest in 1225 Equity, LLC, which own a 49.5% membership interest in 1225 Eye Street, N.W. Associates, which owns the 1225 Eye Street building. As a result of its ownership of 1225 Equity, LLC, Piedmont owns an approximate 49.5% in the 1225 Eye Street building. As the controlling member, Piedmont is deemed to have control of the entities and, as such, consolidates the joint ventures.

[4] Piedmont purchased all of the membership interest in 1201 Equity, LLC, which own a 49.5% membership interest in 1201 Eye Street, N.W. Associates, which owns the 1201 Eye Street building. As a result of its ownership of 1201 Equity, LLC, Piedmont owns an approximate 49.5% in the 1201 Eye Street building. As the controlling member, Piedmont is deemed to have control of the entities and, as such, consolidates the joint ventures.

[5] Property is designated as an industrial property, and is not included in Piedmont’s total building count, which refers only to office properties.

[6] During 2011, Piedmont Office Holdings, Inc. through a wholly-owned subsidiary (Piedmont Power, LLC), commenced a project to install solar panels at the 400 Bridgewater Crossing building. Piedmont Power, LLC is not included in Piedmont’s total building count.

[7] Piedmont’s assets are depreciated or amortized using the straight-lined method over the useful lives of the assets by class. Generally, Tenant Improvements are amortized over the shorter of economic life or lease term, and Lease Intangibles are amortized over the lease term. Generally, Building Improvements are depreciated over 5 - 25 years, Land Improvements are depreciated over 20 - 25 years, and Buildings are depreciated over 40 years.

[8] During the year ended December 31, 2010, Piedmont recorded an impairment charge of approximately $9.6 million on the 111 Sylvan Avenue building as a component of discontinued operations. See Note 17 below for further detail.

[9] Nine property collateralized pool includes:1200 Crown Colony Drive, Braker Pointe III, 2 Gatehall Drive, the One and Two Independence Square, 2120 West End Avenue, 400 Bridgewater Crossing, 200 Bridgewater Crossing, and Fairway Center II.

[10] All of Piedmont’s outstanding debt as of December 31, 2011 and 2010 is interest-only debt.

[11] Piedmont recorded an impairment charge against real estate assets of approximately $7.0 million related to the 111 Sylvan Avenue building at the time it was classified as held-for-sale in May 2010. This wholly-owned asset was subsequently sold in December 2010. In addition, the Fund IX, Fund XI, and REIT Joint Venture recorded an impairment loss on real estate assets of approximately $1.4 million during 2010 related to the 360 Interlocken building; however, Piedmont recorded its proporationate share of the charge (approximately $53,000) in the accompanying consolidated statements of income with other such net property operations as equity in income of unconsolidated joint ventures.

[12] Piedmont recorded impairment charges of approximately $35.1 million related to the following wholly-owned assets: 1) the Auburn Hills Corporate Center building, 2) the 1111 Durham Avenue building, and 3) the 1441 W. Long Lake Road building. In addition, the Wells/Fremont Joint Venture recorded an impairment loss on real estate assets of approximately $3.3 million during 2009 related to the 47300 Kato Road building (f/k/a 47320 Kato Road building); however, Piedmont recorded its proporationate share of the charge (approximately $2.6 million) in the accompanying consolidated statements of income with other such net property operations as equity in income of unconsolidated joint ventures.

[13] Consists of write-offs of intangible lease assets related to lease restructurings, amendments and terminations.