Consolidated Balance Sheets (USD $)	Mar. 31, 2013	Dec. 31, 2012
Assets:
Land	$ 666,479,000	$ 626,076,000
Buildings and improvements, less accumulated depreciation of $902,978 and $883,008 as of March 31, 2013 and December 31, 2012, respectively	3,059,317,000	2,887,791,000
Intangible lease assets, less accumulated amortization of $67,333 and $67,940 as of March 31, 2013 and December 31, 2012, respectively	70,752,000	54,745,000
Construction in progress	29,487,000	20,373,000
Real estate assets held for sale, net	24,954,000	23,747,000
Total real estate assets	3,850,989,000	3,612,732,000
Investments in unconsolidated joint ventures	37,835,000	37,226,000
Cash and cash equivalents	17,575,000	12,957,000
Tenant receivables, net of allowance for doubtful accounts of $375 and $346 as of March 31, 2013 and December 31, 2012, respectively	153,697,000	145,148,000
Due from unconsolidated joint ventures	458,000	463,000
Restricted cash and escrows	683,000	334,000
Prepaid expenses and other assets	12,724,000	13,022,000
Goodwill	180,097,000	180,097,000
Interest rate swap	1,712,000	1,075,000
Deferred financing costs, less accumulated amortization of $11,048 and $10,479 as of March 31, 2013 and December 31, 2012, respectively	5,908,000	6,454,000
Deferred lease costs, less accumulated amortization of $118,673 and $112,289 as of March 31, 2013 and December 31, 2012, respectively	271,337,000	240,140,000
Other assets held for sale, net	5,646,000	5,227,000
Total assets	4,538,661,000	4,254,875,000
Liabilities:
Line of credit and notes payable	1,699,525,000	1,416,525,000
Accounts payable, accrued expenses, and accrued capital expenditures	139,273,000	127,263,000
Deferred income	23,585,000	21,552,000
Intangible lease liabilities, less accumulated amortization of $40,744 and $40,931 as of March 31, 2013 and December 31, 2012, respectively	45,215,000	40,805,000
Interest rate swaps	8,443,000	8,235,000
Total liabilities	1,916,041,000	1,614,380,000
Commitments and Contingencies	0	0
Stockholders' Equity:
Shares-in-trust, 150,000,000 shares authorized; none outstanding as of March 31, 2013 or December 31, 2012	0	0
Preferred stock, no par value, 100,000,000 shares authorized; none outstanding as of March 31, 2013 or December 31, 2012	0	0
Common stock, $.01 par value, 750,000,000 shares authorized; 167,555,401 and 167,556,001 shares issued and outstanding as of March 31, 2013 and December 31, 2012, respectively.	1,676,000	1,676,000
Additional paid-in capital	3,667,614,000	3,667,051,000
Cumulative distributions in excess of earnings	(1,041,552,000)	(1,022,681,000)
Other comprehensive loss	(6,731,000)	(7,160,000)
Piedmont stockholders’ equity	2,621,007,000	2,638,886,000
Noncontrolling interest	1,613,000	1,609,000
Total stockholders’ equity	2,622,620,000	2,640,495,000
Total liabilities and stockholders’ equity	$ 4,538,661,000	$ 4,254,875,000