Gramercy Property Trust 10-Q 8 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Nov. 07, 2013
Document Document And Entity Information [Abstract]	'	'
Entity Registrant Name	'CHAMBERS STREET PROPERTIES	'
Entity Central Index Key	'0001297587	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	236,463,981

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Investments in Real Estate:	'	'
Land	$673,972	$560,622
Buildings and Improvements	1,621,725	1,172,318
Construction in Progress - VIE	0	76,826
Gross investments in Real Estate	2,295,697	1,809,766
Less: Accumulated Depreciation and Amortization	-180,284	-132,129
Net Investments in Real Estate	2,115,413	1,677,637
Investments in Unconsolidated Entities	464,769	515,829
Cash and Cash Equivalents	62,250	107,355
Restricted Cash	15,247	10,998
Tenant and Other Receivables, Net	10,653	6,675
Deferred Rent	33,082	25,210
Deferred Leasing Costs and Intangible Assets, Net	259,733	199,058
Deferred Financing Costs, Net	11,455	8,322
Prepaid Expenses and Other Assets	18,555	3,778
Total Assets	2,991,157	2,554,862
LIABILITIES	'	'
Secured Notes Payable, Net	694,679	502,232
Unsecured Debt	570,000	0
Loans Payable	100,000	'
Accounts Payable, Accrued Expenses and Other Liabilities ($0 and $24,531 of VIE, respectively)	53,767	53,390
Intangible Liabilities, Net	29,229	25,994
Prepaid Rent and Security Deposits	14,551	10,005
Distributions Payable	29,562	37,418
Total Liabilities	1,491,788	894,039
COMMITMENTS AND CONTINGENCIES (NOTE 14)	'	'
NON-CONTROLLING INTERESTS	'	'
Operating Partnership Units	0	2,464
Class B Interest	200	200
Non-Controlling Interest—Variable Interest Entity	0	826
SHAREHOLDERS' EQUITY	'	'
Common Shares of Beneficial Interest, $0.01 par value, 990,000,000 shares authorized; 236,463,981 and 249,664,156 issued and outstanding as of September 30, 2013 and December 31, 2012, respectively	2,359	2,494
Additional Paid-in-Capital	2,066,492	2,203,888
Accumulated Deficit	-563,555	-540,462
Accumulated Other Comprehensive Loss	-6,127	-8,587
Total Shareholders' Equity	1,499,169	1,657,333
Total Liabilities, Non–Controlling Interests and Shareholders' Equity	$2,991,157	$2,554,862

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	$0	$24,531
Common Shares, Par Value	$0.01	$0.01
Common Shares of Beneficial Interest, shares authorized	990,000,000	990,000,000
Common Shares of Beneficial Interest, issued	236,463,981	249,664,156
Common Shares of Beneficial Interest, outstanding	236,463,981	249,664,156

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
REVENUES	'	'	'	'
Rental	$51,162	$37,980	$146,312	$109,866
Tenant Reimbursements	14,178	9,167	40,090	25,566
Total Revenues	65,340	47,147	186,402	135,432
EXPENSES	'	'	'	'
Property Operating	8,625	5,148	22,672	16,483
Real Estate Taxes	9,929	6,752	28,710	17,538
General and Administrative	5,397	7,162	17,710	10,973
Investment Management Fee	0	5,159	489	17,270
Acquisition-Related	175	1,099	2,179	2,508
Depreciation and Amortization	26,635	18,787	75,409	54,749
Transition and Listing	1,447	6,216	12,681	8,152
Total Expenses	52,208	50,323	159,850	127,673
OTHER INCOME AND EXPENSES	'	'	'	'
Interest and Other Income	551	229	1,028	1,714
Interest Expense	-13,120	-8,737	-33,953	-26,528
Gain on Interest Rate Swaps	265	134	1,731	380
Loss on Early Extinguishment of Debt	-1,572	-1,686	-1,572	-1,686
Conversion of Duke JV Equity Investment to Controlling Interest	-1,667	0	75,535	0
Total Other (Expenses) Income	-15,543	-10,060	42,769	-26,120
(Loss) Income Before Provision for Income Taxes and Equity in Income of Unconsolidated Entities	-2,411	-13,236	69,321	-18,361
Provision For Income Taxes	-54	-75	-274	-217
Equity in Income of Unconsolidated Entities	3,324	927	10,263	2,556
Income (Loss) from Continuing Operations	859	-12,384	79,310	-16,022
DISCONTINUED OPERATIONS	'	'	'	'
Realized Loss from Sale	0	0	0	-415
Loss from Discontinued Operations	0	0	0	-415
NET INCOME (LOSS)	859	-12,384	79,310	-16,437
Net (Income) Loss Attributable to Non-Controlling Operating Partnership Units	-3	5	-83	7
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON SHAREHOLDERS	$856	($12,379)	$79,227	($16,430)
Basic and Diluted Net Income (Loss) per Share from Continuing Operations Attributable to Common Shareholders, in dollars per share	$0	($0.05)	$0.32	($0.07)
Basic and Diluted Net Income (Loss) per Share Attributable to Common Shareholders, in dollars per share	$0	($0.05)	$0.32	($0.07)
Basic Weighted Average Vested Shares Outstanding	236,548,477	249,173,577	244,373,249	247,718,798

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]	'	'	'	'
NET INCOME (LOSS)	$859	($12,384)	$79,310	($16,437)
Foreign Currency Translation Gain	10,431	3,194	2,955	1,037
Swap Fair Value Adjustments	-4,714	-361	-495	-2,440
COMPREHENSIVE INCOME (LOSS)	6,576	-9,551	81,770	-17,840
Comprehensive (Income) Loss Attributable to Non-Controlling Operating Partnership Units	-9	4	-85	8
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO COMMON SHAREHOLDERS	$6,567	($9,547)	$81,685	($17,832)

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net Income (Loss)	$79,310	($16,437)
Adjustments to Reconcile Net Income (Loss) to Net Cash Flows Provided by Operating Activities:	'	'
Equity in Income of Unconsolidated Entities	-10,263	-2,556
Distributions from Unconsolidated Entities	30,878	30,503
Gain on Interest Rate Swaps	-1,731	-380
Loss on Early Extinguishment of Debt	1,572	1,191
Loss on Write Down to Net Sales Value	0	415
Gain on Conversion of Equity Investment to Controlling Interest	-75,535	0
Depreciation and Amortization	75,409	54,750
Amortization of Non-Cash Interest Expense	-461	525
Amortization of Above and Below Market Leases	5,028	1,311
Share-Based Compensation	5,354	215
Straight-Line Rent Adjustment	-7,886	-5,473
Changes in Assets and Liabilities:	'	'
Tenant and Other Receivables	-3,978	-3,825
Prepaid Expenses and Other Assets	-10,142	-2,011
Accounts Payable, Accrued Expenses and Other Liabilities	3,971	27,743
Net Cash Flows Provided By Operating Activities	91,526	85,971
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Acquisition of Real Property	-114,457	-127,300
Proceeds from Sales of Discontinued Operations	0	2,885
Investments in Unconsolidated Entities	-105,269	-12,793
Distributions from Unconsolidated Entities	0	32,468
Acquisition Deposit	-2,750	0
Restricted Cash	-4,249	-1,868
Lease Commissions	-404	-1,194
Improvements to Variable Interest Entity	-11,254	-36,077
Improvements to Investments in Real Estate	-6,646	-3,197
Net Cash Flows Used in Investing Activities	-245,029	-147,076
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Net Proceeds from Common Shares—Public Offering	0	150,814
Redemption of Common Shares	-47,429	-35,888
Repurchase and Cancellation of Common Shares	-125,000	0
Repurchase and Cancellation of Vested Shares	-1,585	0
Payment of Distributions	-76,596	-58,373
Distribution to Non-Controlling Interest Operating—Partnership Units	-2,390	-111
Net (Distribution) Contribution from Non-Controlling Interest—Variable Interest Entity	-3,431	140
Borrowings on Unsecured Revolving Credit Facility	364,044	0
Principal Payments on Unsecured Revolving Credit Facility	-529,044	-25,000
Proceeds from Unsecured Term Loan Facilities	570,000	0
Principal Payments on Secured Notes Payable	-34,025	-11,058
Payment of Financing Costs	-6,633	-6,394
Security Deposits	522	259
Net Cash Flows Provided by Financing Activities	108,433	14,389
EFFECT OF FOREIGN CURRENCY TRANSLATION	-35	-153
Net Decrease in Cash and Cash Equivalents	-45,105	-46,868
Cash and Cash Equivalents Beginning of Period	107,355	238,277
Cash and Cash Equivalents, End of the Period	62,250	191,409
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION	'	'
Cash Paid During the Period for Interest	31,805	24,714
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES	'	'
Distributions Declared and Payable	29,562	37,374
Proceeds from Dividend Reinvestment Program	33,580	48,505
Duke JV Contribution/Distribution—Amazon Expansion	19	921
Notes Payable Assumed on Acquisitions of Real Estate	216,011	0
Conversion of Duke JV Equity Investment to Controlling Interest	139,770	0
Share Awards Increase in Additional Paid-In-Capital	5,354	215
Accounts Payable and Accrued Expenses—Construction In Progress	$838	$12,763

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Equity (USD $)	Total	Common Shares	Additional Paid-in- Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
In Thousands, except Share data
Balance at Dec. 31, 2011	$1,668,609	$2,309	$2,038,566	($348,602)	($23,664)
Balance, Shares at Dec. 31, 2011	'	230,955,633	'	'	'
Net Income Attributable to Common Shareholders	-16,430	0	0	-16,430	0
Other Comprehensive Income	-1,402	0	0	0	-1,402
Net Contributions From DRIP of Common Shares, $0.01 Par Value, Shares	'	22,276,303	'	'	'
Net Contributions From DRIP of Common Shares, $0.01 Par Value	219,762	223	219,539	0	0
Share Based Compensation, Shares	'	0	'	'	'
Share-Based Compensation	15	0	15	0	0
Costs Associated with Public Offering	-18,337	0	-18,337	0	0
Redemption of Common Shares, Shares	'	-3,841,599	'	'	'
Redemption of Common Shares	-35,888	-38	-35,850	0	0
Adjustment to Record Non-Controlling Interest at Redemption Value	-121	0	-121	0	0
Distributions	-111,466	0	0	-111,466	0
Balance at Sep. 30, 2012	1,704,742	2,494	2,203,812	-476,498	-25,066
Balance, Shares at Sep. 30, 2012	'	249,390,337	'	'	'
Balance at Dec. 31, 2012	1,657,333	2,494	2,203,888	-540,462	-8,587
Balance, Shares at Dec. 31, 2012	249,664,156	249,664,156	'	'	'
Net Income Attributable to Common Shareholders	79,227	0	0	79,227	0
Other Comprehensive Income	2,460	0	0	0	2,460
Net Contributions From DRIP of Common Shares, $0.01 Par Value, Shares	'	3,534,649	'	'	'
Net Contributions From DRIP of Common Shares, $0.01 Par Value	33,580	36	33,544	0	0
Share Based Compensation, Shares	'	816,425	'	'	'
Share-Based Compensation	5,354	5	5,349	0	0
Repurchase and Cancellation of Vested Shares, Shares	'	-178,078	'	'	'
Repurchase and Cancellation of Vested Shares	-1,585	-2	-1,583	0	0
Redemption of Common Shares, Shares	'	-4,996,934	'	'	'
Redemption of Common Shares	-47,429	-50	-47,379	0	0
Adjustment to Record Non-Controlling Interest at Redemption Value	154	0	154	0	0
Distribution to Non-Controlling Interest	-2,605	0	-2,605	0	0
Repurchase and Cancellation of Common Shares, Shares	-12,376,235	-12,376,237	'	'	'
Repurchase and Cancellation of Common Shares	-125,000	-124	-124,876	0	0
Distributions	-102,320	0	0	-102,320	0
Balance at Sep. 30, 2013	$1,499,169	$2,359	$2,066,492	($563,555)	($6,127)
Balance, Shares at Sep. 30, 2013	236,463,981	236,463,981	'	'	'

Condensed_Consolidated_Stateme4

Condensed Consolidated Statements of Equity (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Statement of Stockholders' Equity [Abstract]	'	'	'
Common Shares, Par Value	$0.01	$0.01	$0.01

Organization_and_Nature_of_Bus

Organization and Nature of Business	9 Months Ended
	Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Organization and Nature of Business	'
	Organization and Nature of Business
	Chambers Street Properties (NYSE: CSG) is a real estate investment trust ("REIT") that is focused on acquiring, owning and operating net-leased industrial and office properties, leased to creditworthy tenants. We were formed under the laws of the state of Maryland on March 30, 2004, and have elected to be taxed as a REIT under sections 856 through 860 of the Internal Revenue Code of 1986 (the "Internal Revenue Code") beginning with the taxable period ended December 31, 2004.
	We operate in an umbrella partnership REIT structure in which our operating partnership, CSP Operating Partnership, LP ("CSP OP"), indirectly owns substantially all of the properties acquired on our behalf. CSP OP was formed in Delaware on March 30, 2004, and we are its majority owner and sole general partner. For each interest in our common shares of beneficial interest $0.01 par value (the "common shares"), that we issue, an equal interest in the limited partnership units of CSP OP is issued to us in exchange for the cash proceeds from the issuance of the interest in our common shares. On August 19, 2013, we redeemed for cash 246,361 Class A limited partnership units, representing approximately a 0.10% ownership of the total limited partnership units, which were owned by CBRE REIT Holdings, LLC ("REIT Holdings"), an affiliate of CBRE Advisors LLC (the "former investment advisor"). As a result, as of September 30, 2013, we owned 100% of the Class A limited partnership units of CSP OP. In exchange for services provided to us relating to our formation and subsequent operations, REIT Holdings also owns a Class B limited partnership interest ("Class B Interest").
	Prior to July 1, 2012, all of our business activities were managed by the former investment advisor pursuant to advisory agreements. On July 1, 2012, we became a self-managed company and changed our name from CB Richard Ellis Realty Trust to Chambers Street Properties in accordance with a plan determined by our Board of Trustees. In addition, as of April 30, 2013, the transitional services agreement with CSP OP ("Transitional Services Agreement") and the former investment advisor that we had entered into as part of our transition to a self-managed company ended and we are now responsible for the management of our day-to-day operations, including the supervision of our employees and third-party service providers. Acquisitions and asset management activities are performed by our employees, with certain services provided by third parties at market rates.
	On May 21, 2013, we listed our common shares on the New York Stock Exchange (the "NYSE") under the symbol "CSG" (the "Listing") and concurrently commenced a modified "Dutch Auction" tender offer to purchase up to $125.0 million in value of the common shares (the "Tender Offer") from our shareholders. As a result of the Tender Offer, on June 26, 2013, we accepted for purchase 12,376,235 common shares at a purchase price of $10.10 per share, for an aggregate cost of approximately $125.0 million, excluding fees and expenses relating to the Tender Offer. As of September 30, 2013, we had 236,463,981 common shares issued and outstanding.
	As of September 30, 2013, we owned, on a consolidated basis, 101 industrial (primarily warehouse/distribution), office and retail properties located in 19 U.S. states (Arizona, California, Colorado, Florida, Georgia, Illinois, Kansas, Kentucky, Maryland, Massachusetts, Minnesota, New Jersey, North Carolina, Ohio, Pennsylvania, South Carolina, Texas, Utah and Virginia) and in the United Kingdom, encompassing approximately 22.8 million net rentable square feet. Our consolidated properties were approximately 94.4% leased (based upon rentable square feet) as of September 30, 2013. As of September 30, 2013, 74 of our consolidated properties were net leased to single tenants, which encompassed approximately 18.1 million rentable square feet.
	We had ownership interests in five unconsolidated entities that, as of September 30, 2013, owned interests in 33 properties. Excluding those properties owned through our investment in CB Richard Ellis Strategic Partners Asia II-A, L.P. ("CBRE Strategic Partners Asia"), we owned, on an unconsolidated basis, 30 industrial (primarily warehouse/distribution), office and retail properties located in nine U.S. states (Arizona, Florida, Illinois, Indiana, Missouri, North Carolina, Ohio, Tennessee and Texas) and in the United Kingdom and other parts of Europe, encompassing approximately 11.7 million rentable square feet. Our unconsolidated properties were approximately 99.1% leased (based upon rentable square feet) as of September 30, 2013. As of September 30, 2013, 18 of our unconsolidated properties were net leased to single tenants, which encompassed approximately 10.2 million rentable square feet.
	Unless the context otherwise requires or indicates, references to, "we," "our" and "us" refer to the activities of and the assets and liabilities of the business and operations of Chambers Street Properties and its subsidiaries.

Basis_of_Presentation_and_Summ

Basis of Presentation and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Basis of Presentation and Summary of Significant Accounting Policies	'
	Basis of Presentation and Summary of Significant Accounting Policies
	Basis of Presentation and Principles of Consolidation
	The accompanying condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles ("U.S. GAAP") and reflect the accounts of the Company, CSP OP and its consolidated subsidiaries. The Company consolidates its wholly-owned properties and joint ventures it controls through either 1) voting rights or similar rights or 2) by means other than voting rights if the Company is deemed to be the primary beneficiary of a variable interest entity. All significant intercompany accounts and transactions are eliminated in consolidation.
	Certain information and footnotes required for annual financial statement presentation have been condensed or excluded pursuant to Securities and Exchange Commission (the "SEC") rules and regulations. Accordingly, our interim financial statements do not include all of the information and disclosures required under U.S. GAAP for complete financial statements. In the opinion of management, all adjustments of a normal recurring nature considered necessary in all material respects to present fairly our financial position, results of our operations and cash flows as of and for the three and nine months ended September 30, 2013 have been made. The results of operations for the three and nine months ended September 30, 2013 are not necessarily indicative of the results of operations to be expected for the entire year. The condensed consolidated financial statements and notes thereto should be read in conjunction with our current Annual Report on Form 10-K, which contains the latest available audited consolidated financial statements and notes thereto, which are as of and for the year ended December 31, 2012.
	Use of Estimates
	The preparation of financial statements, in conformity with U.S. GAAP, requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
	Segment Information
	We currently operate our consolidated properties in two geographic areas, the United States and the United Kingdom. We view our consolidated property operations as three reportable segments, a Domestic Industrial segment, a Domestic Office segment and an International Office/Retail segment, which participate in the acquisition, development, ownership, and operation of high quality real estate in their respective segments.
	Revenue Recognition and Valuation of Receivables
	All leases are classified as operating leases and minimum rents are recognized on a straight-line basis over the terms of the leases. The excess of rents recognized over amounts contractually due pursuant to the underlying leases is recorded as deferred rent. In connection with various leases, we have received irrevocable stand-by letters of credit totaling $15.2 million and $17.8 million as security for such leases at September 30, 2013 and December 31, 2012, respectively.
	Tenant receivables and deferred rent receivables are carried net of the allowances for uncollectible current tenant receivables and deferred rent. Management's determination of the adequacy of these allowances is based primarily upon evaluations of historical loss experience, individual receivables, current economic conditions, and other relevant factors. The allowances are increased or decreased through the provision for bad debts. The allowance for uncollectible rent receivable was $23,000 and $11,000 as of September 30, 2013 and December 31, 2012, respectively.
	Translation of Non-U.S. Currency Amounts
	The financial statements and transactions of our United Kingdom real estate operation are recorded in their functional currency, namely the Great Britain Pound ("GBP") and are then translated into U.S. dollars ("USD").
	Assets and liabilities of this operation are denominated in the functional currency and are then translated at exchange rates in effect at the balance sheet date. Revenues and expenses are translated at the average exchange rate for the reporting period. Translation adjustments are reported in "Accumulated Other Comprehensive Loss," a component of Shareholders' Equity.
	The carrying value of our United Kingdom assets and liabilities fluctuate due to changes in the exchange rate between the USD and the GBP. The exchange rate of the USD to the GBP was $1.6186 and $1.6242 at September 30, 2013 and December 31, 2012, respectively. The profit and loss weighted average exchange rate of the USD to the GBP was approximately $1.5301 and $1.5755 for the three months ended September 30, 2013 and 2012, respectively; and $1.5449 and $1.5790 for the nine months ended September 30, 2013 and 2012, respectively.
	The carrying value of our assets and liabilities held within our joint venture in Europe (the "European JV") fluctuate due to changes in the exchange rate between the USD and the EUR. The exchange rate of the USD to the EUR was $1.3524 and $1.3189 at September 30, 2013 and December 31, 2012. The profit and loss weighted average exchange rate of the USD to the EUR was approximately $1.3175 and $1.2510 for the three months ended September 30, 2013 and 2012, respectively; and $1.3146 and $1.2859 for the nine months ended September 30, 2013 and 2012, respectively.
	Transition and Listing Expenses
	We incurred certain costs in connection with our transition from being an externally managed company to a self-managed company ("Transition Costs"). These Transition Costs consist of legal, consulting and other third-party service provider costs incurred by us in order to execute on our Board of Trustees' decision to become a self-managed company. The Transition Costs included legal and consulting costs resulting from the amendment of our management structure and various corporate relationships, including with respect to our relations with the former investment advisor, exploring and implementing strategic alternatives for information technology, office space and personnel needs, among other expenses. The Transition Costs were primarily incurred during 2012, with the exception of $0.7 million incurred during 2013 as a final settlement of the Transition Services Agreement. Transition Costs of $6.2 million and $8.2 million were incurred during the three and nine months ended September 30, 2012, respectively.
	We incurred certain costs in connection with our Listing and our Tender Offer in 2013. These listing expenses consisted of legal, investment banking, share-based compensation, consulting and other third-party service provider costs incurred by us in order to complete our Listing and Tender Offer. Listing costs totaling $1.4 million and $11.9 million were incurred during the three and nine months ended September 30, 2013, respectively. Of the listing expenses incurred through September 30, 2013, $3.8 million was attributable to share-based compensation.
	Income Taxes
	We elected to be taxed as a REIT under the Internal Revenue Code commencing with our taxable year ended December 31, 2004. To qualify as a REIT, we must meet a number of organizational and operational requirements, including a requirement that we generally distribute at least 90% of our REIT taxable income (determined without regard to the dividends paid deduction and excluding net capital gain). It is our current intention to adhere to these requirements and maintain our REIT qualification. As a REIT, we generally will not be subject to corporate level U.S. federal income tax on net income we distribute currently to our shareholders. If we fail to qualify as a REIT in any taxable year, then we will be subject to U.S. federal income taxes at regular corporate rates (including any applicable alternative minimum tax) and may not be able to qualify as a REIT for four subsequent taxable years. Even if we qualify for taxation as a REIT, we may be subject to certain state and local taxes on our income and property and to U.S. federal income and excise taxes on our undistributed taxable income, if any.
	ASC 740-10 Income Taxes requires recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements or tax returns. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial reporting and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. We did not have a liability for any unrecognized benefits as of September 30, 2013. The tax years from 2008 through 2012 remain open to examination by the taxing jurisdictions to which the company is subject.
	Included as a component of our tax provision, we have incurred income and other taxes (franchise, local and state government and international) related to our continuing operations in the amount of $54,000, $75,000, $0.3 million and $0.2 million during the three and nine months ended September 30, 2013 and 2012, respectively. The United Kingdom taxes real property operating results at a statutory rate of 20%. The United Kingdom taxable losses to date have generated a deferred tax asset of approximately $0.8 million consisting of these net operating loss carryforwards. We have provided for a full valuation allowance of $0.8 million as of September 30, 2013 on deferred tax assets because it is not likely that future operating profits in the United Kingdom would be sufficient to absorb the net operating losses.
	Reclassifications
	To better present our condensed consolidated balance sheets and condensed consolidated statements of operations we have chosen to combine certain line items together instead of disclosing them as separate line items.
	In addition, we have reclassified certain amounts in our previously issued balance sheets and statements of operations to conform to current period presentations. On our balance sheet as of December 31, 2012, we have reclassified $8.2 million related to prepaid rents from "Accounts Payable, Accrued Expenses and Other Liabilities" to "Prepaid Rent and Security Deposits", which represents a newly created line item.
	We have reclassified amounts related to property management general and administrative expense for the three and nine months ended September 30, 2012 of $379,000 and $1.0 million, respectively, from "General and Administrative" expense to "Property Operating" expense, which represents a newly created line item.
	None of the reclassifications reflect corrections of any amounts.
	New Accounting Standards
	In January 2013, the FASB issued ASU 2013-1, Clarifying the Scope of Disclosures About Offsetting Assets and Liabilities, which clarifies which instruments and transactions are subject to the offsetting disclosure requirements established by ASU 2011-11. The ASU clarifies that the scope applied to derivatives accounted for in accordance with the Derivatives and Hedging topic of the Codification, including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions that are either offset in accordance with the Offsetting Presentation section of the Balance Sheet topic or the Presentation section of the Derivatives and Hedging topic or subject to an enforceable master netting arrangement or similar agreement.
	In February 2013, the FASB issued ASU No. 2013-2, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income ("ASU 2013-2"). This update requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income.
	The ASU amendment and the subsequent clarification of the amendment are effective for periods beginning on or after January 1, 2013, and must be shown for all periods shown on the balance sheet. The adoption of these ASU amendments did not have a material effect on our financial condition, results of operations, or disclosures.
	In July 2013, the FASB issued ASU No. 2013-10, Inclusion of the Fed Funds Effective Swap Rate (or Overnight Index Swap Rate) as a Benchmark Interest Rate for Hedge Accounting Purposes (Topic 815), which permits for the inclusion of the Fed Funds Effective Swap Rate (OIS) as a U.S. benchmark interest rate for hedge accounting purposes, in addition to interest rates on direct Treasury obligations of the U.S. government (UST), and the London Interbank Offered Rate (LIBOR). The ASU amendments also remove the restriction on using different benchmark interest rates for similar hedges. ASU No. 2013-10 is effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. The adoption of this ASU did not have a material effect on our financial condition, results of operations, or disclosures.

Investment_in_Real_Estate_Acti

Investment in Real Estate Activity	9 Months Ended
	Sep. 30, 2013
Real Estate [Abstract]	'
Acquisition of Real Estate	'
	Investment in Real Estate Activity
	Wholly-Owned Property Acquisitions
	On July 31, 2013, we acquired the Carpenter Corporate Center I & II ("Carpenter Center"), located in Irving, Texas, a suburb of Dallas. We acquired Carpenter Center for approximately $49.5 million, exclusive of customary closing costs. The acquisition was funded using borrowings under our unsecured revolving credit facility. Carpenter Center is a 226,822 square foot office complex and is 100% net leased to Corphealth, Inc. through June 2023. Corphealth, Inc. is a subsidiary of Humana, Inc., a large health care company.
	On August 8, 2013, we acquired 1200 Woods Chapel Road, ("1200 Woods Chapel") located in Duncan, South Carolina, a suburb of Spartanburg. We acquired 1200 Woods Chapel for approximately $10.8 million exclusive of customary closing costs. The acquisition was funded using borrowings under our unsecured revolving credit facility. 1200 Woods Chapel is a 156,800 square foot warehouse/distribution building and is 100% net leased to Lear Operations Corporation, through April 2019. Lear Operations Corporation is a subsidiary of Lear Corporation, a large supplier of automotive seating and electrical power management systems.
	The following table summarizes the preliminary allocation of the fair value of amounts recognized for each major class of assets and liabilities (in thousands):
			Carpenter Center			1200 Woods Chapel			Total
	Land		$	5,901		$	1,560		$	7,461
	Building and Improvements		35,950			7,357			43,307
	Acquired In-Place Leases (1)		7,795			1,237			9,032
	Acquired Above-Market Leases (1)		481			596			1,077
	Total Acquired Assets		50,127			10,750			60,877
	Acquired Below-Market Leases (2)		618			—			618
	Total Assumed Liabilities		618			—			618
	Net Assets Acquired		$	49,509		$	10,750		$	60,259
	__________
	-1	Represents in-place leases with a weighted average amortization period of 9.34 years and above-market leases with a weighted average amortization period of 7.56 years.
	-2	Represents below-market leases with a weighted average amortization period of 9.92 years.
	The following table summarizes the combined results from operations for Carpenter Center and 1200 Woods Chapel from July 31, 2013 and August 8, 2013, the respective dates of acquisition, through September 30, 2013 (in thousands):
	Revenues	$	876
	Net Income	$	254
	Purchase of Outside Equity Interests in Properties
	On January 30, 2013, we completed construction of a build-to-suit project at 1400 Atwater Drive located in Malvern, Pensylvania. The project had previously been accounted for as a consolidated VIE and all activity had been included on the consolidated balance sheet as Construction in progress - VIE. Upon substantial completion of construction, we acquired our outside partner's 5% interest in the project for approximately $3.4 million.
	On March 1, 2013, we acquired the remaining 20% interest in 17 properties that were held in a joint venture with Duke Realty ("Duke Portfolio"). The properties are located in the submarkets of Phoenix, Raleigh/Durham, Houston, Columbus, Cincinnati, Orlando, Ft. Lauderdale, Minneapolis and Dallas and consisted of 16 office buildings and one warehouse/distribution building totaling 3,318,402 square feet. The acquisition was structured such that membership interests in each of the subsidiaries that hold the properties were distributed to Duke Realty and CSP OP on a pro rata basis in accordance with their percentage ownership interests in the Duke JV (80% to CSP OP and 20% to Duke Realty) and CSP OP then purchased Duke Realty's 20% membership interests in those subsidiaries, resulting in CSP OP owning a 100% interest in each of the property-owning subsidiaries. CSP OP paid Duke Realty approximately $98.1 million to acquire the remaining 20% interest in these properties, corresponding to a valuation of approximately $490.7 million for a 100% interest in these properties. The transaction constituted a change in control of the previously unconsolidated 17 properties, which required a remeasurement of the net assets acquired to fair value. This resulted in a gain of $75.5 million upon acquisition.
	The following table summarizes the results from continuing operations since the consolidation of the Duke Portfolio on March 1, 2013 through September 30, 2013 (in thousands). We previously included the results from operations of the Duke Portfolio in equity in earnings.
	Revenues	$	35,781
	Net income	$	499
	The following table summarizes the preliminary allocation of the fair value of amounts recognized for each major class of assets and liabilities (in thousands):
	Land	$	60,473
	Building and Improvements	363,778
	Acquired In-Place Leases (1)	64,421
	Acquired Above-Market Leases (1)	21,084
	Total Acquired Assets	509,756
	Secured Notes Payable, Net (2)	229,539
	Acquired Below-Market Leases (3)	5,549
	Total Assumed Liabilities	235,088
	Fair Value of Acquired Net Assets (Represents 100% Interest)	$	274,668
	__________
	-1	Represents in-place leases with a weighted average amortization period of 6.84 years and above-market leases with a weighted average amortization period of 7.81 years.
	-2	Secured notes payable is presented net of a premium of $13.5 million.
	-3	Represents below-market leases with a weighted average amortization period of 7.83 years.
	Unaudited pro forma results, assuming the acquisitions of the Carpenter Center and 1200 Woods Chapel properties and the remaining 20% equity interest in the Duke Portfolio had occurred as of January 1, 2012, are presented below. Non-recurring acquisition costs totaling $0.2 million and $2.2 million are excluded from the 2013 pro forma results and are included in the three and nine months ended September 30, 2012 as an operating expense.
	These unaudited pro forma results have been prepared for comparative purposes only and include certain adjustments, such as increased depreciation and amortization expenses as a result of tangible and intangible assets acquired in the acquisitions. These unaudited pro forma results do not purport to be indicative of what operating results would have been had the acquisitions actually occurred on January 1, 2012 and may not be indicative of future operating results. (in thousands, except share data)
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Revenues	$	65,971		$	67,557		$	200,742		$	200,432
	Net Operating Income	13,687			2,595			32,366			23,945
	Net Income	1,411			(9,234		)	84,056			(7,773		)
	Basic and Diluted Income per Share	$	0.01		$	(0.04	)	$	0.34		$	(0.03	)
	Discontinued Operations
	During the nine months ended September 30, 2012, the Company recognized a loss from discontinued operations of $0.4 million associated with a write-down of the Cherokee Corporate Park property to its net sales value realized on the July 9, 2012 property sale of approximately $2.9 million.

Investments_in_Unconsolidated_

Investments in Unconsolidated Entities	9 Months Ended
	Sep. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]	'
Investments in Unconsolidated Entities	'
	Investments in Unconsolidated Entities
	As of September 30, 2013 and December 31, 2012, we owned the following number of properties through unconsolidated joint venture entities.
		Ownership %		September 30,		December 31,
				2013		2012
	Duke JV	80.00%		20		37
	European JV	80.00%		6		6
	UK JV	80.00%		3		3
	Afton Ridge	90.00%		1		1
	CBRE Strategic Partners Asia	5.07%		3		7
				33		54
	Investments in unconsolidated entities at September 30, 2013 and December 31, 2012 consist of the following (in thousands):
		September 30,			December 31,
		2013			2012
	Duke JV	$	267,572		$	344,511
	European JV	112,155			108,725
	UK JV	36,217			37,487
	Afton Ridge	39,400			17,008
	CBRE Strategic Partners Asia	9,425			8,098
		$	464,769		$	515,829
	The following is a summary of the investments in unconsolidated entities for the nine months ended September 30, 2013 and the year ended December 31, 2012 (in thousands):
		September 30,			December 31,
		2013			2012
	Investment Balance, January 1	$	515,829		$	537,631
	Contributions	105,269			45,568
	Company's Equity in Net Income (including adjustments for basis differences)	10,263			3,959
	Other Comprehensive Income of Unconsolidated Entities	4,056			1,144
	Conversion of Duke JV Equity Investment to Controlling Interest	(139,770		)	—
	Distributions	(30,878		)	(72,473		)
	Investment Balance, End of Period	$	464,769		$	515,829
	The combined balance sheets of our investments in unconsolidated entities at September 30, 2013 and December 31, 2012 are as follows (in thousands):
		September 30,			December 31,
		2013			2012
	Assets
	Investments in Real Estate (1)	$	929,665		$	1,240,196
	Other Assets	100,293			231,173
	Total Assets	$	1,029,958		$	1,471,369
	Liabilities and Equity
	Secured Notes Payable, net	$	239,730		$	620,457
	Other Liabilities	40,640			56,312
	Total Liabilities	280,370			676,769
	CSP Equity	464,769			515,829
	Other Investors' Equity	284,819			278,771
	Total Liabilities and Equity	$	1,029,958		$	1,471,369
	__________
	-1	Includes REIT Basis Adjustments for costs incurred by the Company outside of the Duke JV and Afton Ridge entities that are directly capitalizable to its investment in real estate assets acquired within the respective entities, including acquisition costs paid to our former investment advisor prior to January 1, 2009.
	The combined statements of operations for our investments in unconsolidated entities for the three and nine months ended September 30, 2013 and 2012 are as follows (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013		2012
	Total Revenue	$	29,110		$	38,424		$	102,546	$	112,193
	Operating Expenses	7,259			12,616			26,627		41,783
	Net Operating Income	21,851			25,808			75,919		70,410
	Depreciation and Amortization	10,456			17,162			31,110		51,447
	Interest Expense	2,799			6,666			11,695		19,722
	Net Income (Loss) from Continuing Operations	8,596			1,980			33,114		(759		)
	Income from Discontinued Operations	12			—			2,248		—
	Net Income (Loss)	8,608			1,980			35,362		(759		)
	Company Share in Net Income	3,346			966			9,797		2,672
	Adjustments for REIT basis	(22		)	(39		)	466		(116		)
	CSP Equity in Net Income	$	3,324		$	927		$	10,263	$	2,556
	Investments in Unconsolidated Entities Activity
	During the first quarter of 2013, five ownership interests in Japan that were owned through CBRE Strategic Partners Asia II-A, L.P., or CBRE Strategic Partners Asia, were sold. During the second quarter of 2013, CBRE Strategic Partners Asia purchased one ownership interest in China.
	On March 1, 2013, we acquired our outside partner's 20% interest in 17 properties that were held by Duke JV. See Note 3 for a further discussion of this transaction.
On July 2, 2013, we contributed $79.8 million to the Duke JV for our 80% share of the payoff (inclusive of accrued interest) of five fixed rate mortgage notes that were cross-collateralized and secured by the following five properties: Buckeye Logistics Center, Aspen Corporate Center 500, AllPoints at Anson Bldg. 1, 12200 President's Court, and 201 Sunrise Blvd. The notes were paid in full by the joint venture on July 3, 2013 for the total remaining principal balance of $99.2 million.
On July 2, 2013, we contributed $25.5 million to Afton Ridge to pay off the mortgage note secured by the property. The note was paid in full by the joint venture on July 3, 2013. Our joint venture partner will reimburse their portion of the loan payoff totaling $2.6 million to the joint venture.

Deferred_Leasing_Costs_and_Int

Deferred Leasing Costs and Intangible Assets and Liabilities	9 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Deferred Leasing Costs and Intangible Assets and Liabilities	'
	Deferred Leasing Costs and Intangible Assets and Liabilities
	The following table summarizes our deferred leasing costs and intangible assets (including acquired above-market leases and acquired in-place leases) and intangible liabilities (including acquired below market leases, and acquired above-market ground lease obligations).
		September 30,			December 31,
		2013			2012
		(in thousands)
	Deferred Leasing Costs and Intangible Assets, Net:
	Deferred Leasing Costs	$	6,789		$	6,350
	Accumulated Amortization	(2,405		)	(1,705		)
	Deferred Leasing Costs, Net	4,384			4,645
	Above-Market Leases	77,381			55,219
	Accumulated Amortization	(31,265		)	(23,364		)
	Above-Market Leases, Net	46,116			31,855
	In-Place Leases	325,903			252,501
	Accumulated Amortization	(116,670		)	(89,943		)
	In-Place Leases, Net	209,233			162,558
	Total Deferred Leasing Costs and Intangible Assets, Net	$	259,733		$	199,058
	Intangible Liabilities, Net:
	Below-Market Leases	$	49,820		$	43,659
	Accumulated Amortization	(21,950		)	(19,077		)
	Below-Market Leases, Net	27,870			24,582
	Above-Market Ground Lease Obligation	1,501			1,501
	Accumulated Amortization	(142		)	(89		)
	Above-Market Ground Lease Obligation, Net	1,359			1,412
	Total Intangible Liabilities, Net	$	29,229		$	25,994
	The following table sets forth amortization related to intangible assets and liabilities for the three and nine months ended September 30, 2013 and 2012 (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Deferred Leasing Costs (1)	$	236		$	179		$	(700	)	$	499
	Above-Market Leases (2)	2,664			1,903			7,901			5,637
	In-Place Leases (1)	9,210			7,420			26,712			21,543
	Below-Market Leases (2)	(708		)	(2,093		)	(2,873		)	(4,326		)
	Above-Market Ground Lease Obligation (3)	(18		)	(18		)	(53		)	(53		)
	__________
	-1	The amortization of deferred leasing costs and in-place leases are recorded to depreciation and amortization expense in the condensed consolidated statements of operations for the periods presented.
	-2	The amortization of above-market leases and below-market leases are recorded as reductions and additions to rental income, respectively, in the condensed consolidated statements of operations for the periods presented.
	-3	The amortization of the above-market ground lease obligation is recorded as a decrease to property operating expense in the condensed consolidated statements of operations for the periods presented.
	The following is a schedule of future amortization of deferred leasing costs, intangible assets and liabilities as of September 30, 2013 (in thousands):
		Intangible Assets									Intangible Liabilities
		Deferred Leasing Costs			Acquired			Acquired			Acquired			Above-Market
					Above-Market			In-Place Leases			Below-Market			Ground Lease
					Leases						Leases			Obligations
	Remaining 2013	$	239		$	2,486		$	9,738		$	1,042		$	18
	2014	905			9,507			37,020			4,156			71
	2015	703			9,093			34,682			3,986			71
	2016	599			5,551			27,870			3,398			71
	2017	541			4,406			23,395			2,898			71
	2018	499			3,898			20,472			2,579			71
	Thereafter	898			11,175			56,056			9,811			986
		$	4,384		$	46,116		$	209,233		$	27,870		$	1,359

Debt

Debt	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Debt	'
	Debt
	Secured notes payable are summarized as follows (in thousands):
			Stated Interest Rate		Effective Interest Rate (1)		Maturity Date		September 30,			December 31,
	Property								2013			2012
	Albion Mills Retail Park - Swapped to Fixed (2) (3)		5.25%		5.25%		October 10, 2013		$	9,338		$	9,288
	Avion Midrise III & IV		5.52%		7.00%		April 1, 2014		20,103			20,464
	Maskew Retail Park - Swapped to Fixed(3)		5.68%		5.68%		August 10, 2014		22,621			22,698
	12650 Ingenuity Drive		5.62%		7.50%		October 1, 2014		11,952			12,272
	Bolingbrook Point III		5.26%		5.26%		January 1, 2015		7,900			7,900
	One Wayside Road		5.66%		5.25%		August 1, 2015		13,452			13,745
	One Wayside Road		5.92%		5.25%		August 1, 2015		11,244			11,464
	Lakeside Office Center		6.03%		6.03%		September 1, 2015		8,773			8,862
	Deerfield Commons I		5.23%		5.23%		December 1, 2015		9,329			9,442
	Celebration Office Center III(4)(5)		4.25%		2.50%		December 1, 2015		9,043			—
	22535 Colonial Pkwy(4)(5)		4.25%		2.50%		December 1, 2015		8,091			—
	Northpoint III(4)(5)		4.25%		2.50%		December 1, 2015		10,470			—
	Goodyear Crossing Ind. Park II(4)(5)		4.25%		2.50%		December 1, 2015		19,989			—
	3900 North Paramount Parkway(4)(5)		4.25%		2.50%		December 1, 2015		7,853			—
	3900 South Paramount Parkway(4)(5)		4.25%		2.50%		December 1, 2015		7,853			—
	1400 Perimeter Park Drive(4)(5)		4.25%		2.50%		December 1, 2015		2,380			—
	Miramar I(4)(5)		4.25%		2.50%		December 1, 2015		9,328			—
	Miramar II(4)(5)		4.25%		2.50%		December 1, 2015		12,565			—
	70 Hudson Street		5.65%		5.15%		April 11, 2016		116,585			117,981
	Point West I - Swapped to Fixed(4)		3.41%		3.41%		December 6, 2016		11,123			—
	100 Tice Blvd		5.97%		4.38%		September 15, 2017		19,684			20,094
	100 Tice Blvd		5.97%		4.38%		September 15, 2017		19,684			20,093
	4701 Gold Spike Drive(6)		4.45%		4.45%		March 1, 2018		10,202			10,342
	1985 International Way(6)		4.45%		4.45%		March 1, 2018		7,089			7,186
	Summit Distribution Center(6)		4.45%		4.45%		March 1, 2018		6,418			6,506
	3770 Deerpark Boulevard(6)		4.45%		4.45%		March 1, 2018		7,328			7,428
	Tolleson Commerce Park II(6)		4.45%		4.45%		March 1, 2018		4,406			4,467
	Atrium I - swapped to fixed(4)		3.78%		3.78%		May 31, 2018		22,750			—
	McAuley Place(4)		3.98%		3.50%		September 1, 2018		13,319			—
	Easton III - Swapped to Fixed(4)		3.95%		3.95%		January 31, 2019		6,513			—
	90 Hudson Street		5.66%		5.26%		May 1, 2019		105,321			106,465
	Fairforest Bldg. 6		5.42%		6.50%		June 1, 2019		2,166			2,402
	North Rhett I		5.65%		6.50%		August 1, 2019		2,513			2,827
			Stated Interest Rate		Effective Interest Rate (1)		Maturity Date		September 30,			December 31,
	Property								2013			2012
	Kings Mountain II		5.47%		6.50%		January 1, 2020		4,183			4,589
	North Rhett II		5.20%		6.50%		October 1, 2020		1,678			1,822
	Mount Holly Bldg.		5.20%		6.50%		October 1, 2020		1,678			1,822
	Orangeburg Park Bldg.		5.20%		6.50%		October 1, 2020		1,706			1,853
	Kings Mountain I		5.27%		6.50%		October 1, 2020		1,453			1,578
	Ten Parkway North		4.75%		4.75%		January 1, 2021		11,852			12,072
	Union Cross Bldg. II		5.53%		6.50%		June 1, 2021		6,644			7,149
	Union Cross Bldg. I		5.50%		6.50%		July 1, 2021		2,180			2,344
	Norman Pointe I(4)		5.24%		3.50%		October 1, 2021		20,593			—
	Norman Pointe II(4)		5.24%		3.50%		October 1, 2021		22,672			—
	The Landings I(4)		5.24%		3.50%		October 1, 2021		15,498			—
	The Landings II(4)		5.24%		3.50%		October 1, 2021		13,670			—
	Fairforest Bldg. 5		6.33%		6.50%		February 1, 2024		8,421			8,840
	North Rhett IV		5.80%		6.50%		February 1, 2025		8,547			8,935
	Thames Valley Five - Swapped to Fixed(7)		6.42%		6.42%		May 29, 2013		—			9,160
	Sabal Pavilion(8)		6.38%		3.00%		August 1, 2013		—			14,700
	Total Secured Notes Payable								678,160			496,790
	Plus Premium								18,088			7,555
	Less Discount								(1,569		)	(2,113		)
	Total Secured Notes Payable, Net								$	694,679		$	502,232
	__________
	-1	Represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of any discounts/premiums, excluding debt issuance costs.
	-2	This loan is presented at fair value. The fair value adjustment to its cost basis was $(3) and $(85) as of September 30, 2013 and December 31, 2012, respectively.  We paid off this loan in full subsequent to September 30, 2013. See Note 17 for additional information.
	-3	The loan is subject to certain financial covenants (interest coverage and loan to value).
-4	The loans were assumed in connection with the acquisition of Duke Realty's 20% interest in the 17 properties held by the Duke JV on March 1, 2013 and were recorded at estimated fair value which included a $13.5 million total premium.
-5	These nine loans are cross-collateralized.
-6	These five loans are cross-collateralized.
-7	The loan was paid off in full on May 29, 2013.
-8	The loan was paid off in full on May 1, 2013.
Unsecured Term Loan Facilities
On March 6, 2013, we entered into an unsecured term loan in the amount of $50.0 million (the"TD Term Loan") with TD Bank, N.A ("TD Bank"). Upon closing the TD Term Loan, we simultaneously entered into an interest rate swap agreement with TD Bank to effectively fix the interest rate on the TD Term Loan at 3.425% per annum for its seven year term, based upon the TD Term Loan's then current stated applicable margin. This applicable margin, and therefore the effective interest rate on the TD Term Loan, may vary during its term by an increase of up to 0.75% based upon the then current leverage ratio. In the event that the Company obtains a credit rating, the applicable margin on the TD Term Loan can vary from a 0.60% reduction to a 0.20% increase based upon our then current credit rating. The TD Term Loan contains customary representations and warranties and covenants. We used the proceeds of the TD Term Loan to repay a portion of our borrowings under our unsecured revolving credit facility.
On March 7, 2013, we entered into an unsecured term loan in the amount of $200.0 million (the "WF Term Loan #1") with Wells Fargo Bank, National Association ("Wells Fargo Bank") and certain other lenders. Upon closing the WF Term Loan #1, we simultaneously entered into an interest rate swap agreement with Wells Fargo Bank to effectively fix the interest rate on the WF Term Loan #1 at 2.4885% per annum for its five-year term, based upon the WF Term Loan #1's then current stated applicable margin. This applicable margin, and therefore the effective interest rate on the WF Term Loan #1, may vary during its term by an increase of up to 0.60% based upon the then current leverage ratio. In the event that the Company obtains a credit rating, the applicable margin on the WF Term Loan #1 can vary from a 0.40% reduction to a 0.50% increase based upon our then current credit rating. The WF Term Loan #1 contains customary representations and warrants and covenants. We used the proceeds to repay a portion of our borrowings under our unsecured revolving credit facility.
On September 12, 2013, we entered into an unsecured term loan in the amount of $120.0 million (the "Capital One Term Loan") with Capital One, National Association ("Capital One") and certain other lenders. Upon closing the Capital One Term Loan, we simultaneously entered into an interest rate swap agreement with Capital One to effectively fix the interest rate on the Capital One Term Loan at 4.42125% per annum for its entire term until the Capital One Term Loan's scheduled maturity on January 31, 2021, based upon the Capital One Term Loan's current stated applicable margin. This applicable margin, and therefore the effective interest rate on the Capital One Term Loan, may vary during its term from a 0.20% reduction to a 0.35% increase based upon the then current leverage ratio. In the event the Company obtains a credit rating, the applicable margin on the Capital One Term Loan can vary from a 0.55% reduction to a 0.25% increase based upon our then current credit rating. We used the majority of the proceeds to repay a portion of our borrowings under our unsecured revolving credit facility.
On September 26, 2013, in connection with the second amendment to the Credit Agreement with Wells Fargo Bank (the "Second Amendment") (see additional information below under "Unsecured Revolving Credit Facility"), our WF Term Loan #1 was replaced with a new unsecured term loan (the "WF Term Loan #2") with the same amount of $200.0 million and the same maturity date of March 7, 2018 as for the WF Term Loan #1. The existing swap agreement entered into on March 7, 2013 upon closing of the WF Term Loan #1 remained in place and is now applicable to the WF Term Loan #2 in order to effectively fix its interest rate at 2.6385% per annum for its term, based upon the WF Term Loan #2's current stated applicable margin. In addition, on September 26, 2013, and also in connection with the Second Amendment (see additional information below under "Unsecured Revolving Credit Facility"), we entered into a new $200.0 million unsecured term loan (the "WF Term Loan #3"). Upon closing the WF Term Loan #3, we simultaneously entered into an interest rate swap agreement to effectively fix the interest rate on the WF Term Loan #3 at 3.274% per annum for its entire term until the WF Term Loan #3's scheduled maturity on January 15, 2019, based upon the WF Term Loan #3's current stated applicable margin. The applicable margin on both the WF Term Loan #2 and the WF Term Loan #3, and therefore the effective interest rate on both of these loans, may vary during their terms from a 0.20% reduction to a 0.35% increase based upon the then current leverage ratio. In the event the Company obtains a credit rating, the applicable margin on the WF Term Loan #2 and the WF Term Loan #3 can vary from a 0.70% reduction to a 0.30% increase based upon our then current credit rating. We used the majority of the WF Term Loan #3 proceeds to repay a portion of our borrowings under our unsecured revolving credit facility.
Unsecured Revolving Credit Facility
The terms of our unsecured revolving credit facility are set forth in the table below.
	September 30,				December 31,
	2013				2012
	(in thousands)
Outstanding Borrowings	$	100,000			$	265,000
Remaining Borrowing Capacity	750,000				435,000
Total Borrowing Capacity	$	850,000			$	700,000
Interest Rate(1)	1.88		%		1.82		%
Unused Fee-Annual Rate(2)	30bps				30bps
Maturity Date(3)	Jan-18				Sep-16
__________
-1	Calculated based on one-month LIBOR plus 1.70% and 1.60% as of September 30, 2013 and December 31, 2012, respectively.
-2	The unused fee is paid on a quarterly basis and may be reduced to 25bps of the unused amount if our unsecured revolving credit facility utilization is greater than 50% of its capacity.
-3	Under the original and amended terms of our unsecured revolving credit facility, we may exercise an option to extend the maturity date by one year.
On September 13, 2012, we entered into a credit agreement with a group of lenders to provide us with an unsecured revolving credit facility with an initial capacity of $700.0 million (the "Credit Agreement"). This unsecured revolving credit facility had a term of four years, which term may have been extended for one year at our option provided that we were not then in default and upon payment of customary extension fees.
On March 7, 2013, we entered into a First Amendment to our Credit Agreement (the "First Amendment"). The First Amendment modified our unsecured revolving credit facility to among other things: (i) amend certain definitions, (ii) amend certain requirements of the guarantor, (iii) amend the requirements relating to quarterly financial statements, annual statements, compliance certificates and certain other SEC filings, (iv) amend the requirements relating to electronic delivery of information, (v) provide the Company with an option to restate the tangible net worth covenant in the event of a redemption event, (vi) remove the restriction on negative pledges, (vii) amend the restrictions on intercompany transfers and (viii) amend certain disclosure and confidentiality provisions.
On September 26, 2013, we entered into the Second Amendment to our Credit Agreement. The Second Amendment modified our unsecured revolving credit facility to increase its capacity from $700.0 million to $850.0 million. The unsecured revolving credit facility's term was extended to January 15, 2018, which may be extended for one year at our option upon the payment of customary extension fees, provided that we are not then in default. The unsecured revolving credit facility has no minimum outstanding balance requirements. The applicable margin on the unsecured revolving credit facility can vary from (i) 1.50% to 2.05% based upon the Company's then current leverage ratio. In the event the Company obtains a credit rating, the applicable margin on the unsecured revolving credit facility can vary from 0.90% to 1.70% based upon the then current credit rating of the Company or CSP OP.
Debt Covenants and Restrictions
Certain of our secured notes payable are subject to certain financial covenants (interest coverage and loan to value).
As of September 30, 2013, our unsecured term loan facilities and revolving credit facility were subject to certain financial covenants that require, among other things: the maintenance of (i) a leverage ratio of not more than 0.60; (ii) a fixed charge coverage ratio of at least 1.50; (iii) a secured leverage ratio of not more than (a) 0.45 prior to September 13, 2014, or (b) 0.40 thereafter; (iv) an unencumbered leverage ratio of not more than 0.60; (v) a ratio of unencumbered net operating income to unsecured interest expense of at least 1.75 (unless the Company or CSP OP obtains an investment grade credit rating, in which case this requirement is eliminated); (vi) minimum tangible net worth of $1.5 billion plus 85% of the net proceeds of certain future equity issuances; and (vii) unencumbered asset value of at least $400.0 million. In addition, our unsecured term loan facilities and revolving credit facility contain a number of customary non-financial covenants including those restricting liens, mergers, sales of assets, certain investments in unimproved land and mortgage receivables, intercompany transfers, transactions with affiliates and distributions. The Company and certain of its subsidiaries have provided guarantees in connection with our unsecured term loan facilities and revolving credit facility. As of September 30, 2013, we were in compliance with all debt covenants.
The minimum principal payments due for our secured notes payable, unsecured term loan facilities and unsecured revolving credit facility are as follows as of September 30, 2013 (in thousands):
Remaining 2013	$	13,278
2014	70,225
2015	148,476
2016	134,179
2017	46,355
2018	372,070
Thereafter	563,580
	$	1,348,163

Risk_Management_and_Use_of_Fin

Risk Management and Use of Financial Instruments	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Risk Management and Use of Financial Instruments	'
	Risk Management and Use of Financial Instruments
	Risk Management
	In the course of our ongoing business operations, we encounter economic risk. There are three main components of economic risk: interest rate risk, credit risk and market risk. We are subject to interest rate risk on our interest-bearing liabilities. Credit risk is primarily the risk of inability or unwillingness of tenants to make contractually required payments and of counterparties on derivatives contracts to fulfill their obligations. Market risk is the risk of declines in the value of our properties due to changes in rental rates, interest rates, supply and demand of similar products and other market factors affecting the valuation of properties.
	Derivative Financial Instruments
	We utilize interest rate swaps to mitigate the effects of interest rate fluctuations on our variable-rate loans. Our strategy is to use a swap to convert the floating-rate borrowing (usually a secured note payable or an unsecured term loan facility) where LIBOR is consistently applied into a fixed-rate obligation with the only variable piece remaining is the spread between different reset dates when/if the swap and debt are not lined up. We generally enter into an interest rate swap agreement concurrently with the origination of the variable-rate loan for an equivalent principal amount for a period covering the term of the loan, which effectively converts our variable-rate debt to a fixed-rate loan. Our use of derivative instruments, including swaps, is limited by policy to hedging or mitigating commercial risk and we do not use derivative instruments for speculative, trading or investment purposes.
	The following table sets forth the terms of our interest rate swaps at September 30, 2013 and December 31, 2012 (amounts in thousands):
		Notional Amount								Fair Value						Rate
	Type of Instrument	30-Sep-13				31-Dec-12				30-Sep-13			31-Dec-12			30-Sep-13		31-Dec-12		Index	Maturity Date
	Interest Rate Swap(1)	$	9,249			$	9,280			$	(9	)	$	(241	)	3.4	%	3.4	%	GBP LIBOR(2)	October 10, 2013
	Interest Rate Swap	22,621				22,698				(549		)	(1,015		)	2.9	%	2.9	%	GBP LIBOR(2)	August 10, 2014
	Interest Rate Swap(3)	11,123								(228		)				1.2	%			LIBOR	December 6, 2016
	Interest Rate Swap(4)	200,000								1,924						0.8	%			LIBOR	March 7, 2018
	Interest Rate Swap(3)	22,750								(505		)				1.6	%			LIBOR	May 31, 2018
	Interest Rate Swap	200,000								(987		)				1.4	%			LIBOR	January 15, 2019
	Interest Rate Swap(3)	6,513								(144		)				1.8	%			LIBOR	January 31, 2019
	Interest Rate Swap(4)	50,000								1,001						1.3	%			LIBOR	March 6, 2020
	Interest Rate Swap	120,000								(3,741		)				2.4	%			LIBOR	January 31, 2021
	Interest Rate Swap(5)	—				9,160				—			(182		)			4.9	%	GBP LIBOR(2)	May 30, 2013
	__________
	-1	We terminated the interest rate swap in October 2013. See Note 17 for additional information.
	-2	Based on the three month GBP-based LIBOR BBA Index with variable rate reset dates every 90 days during the term of the swaps.
	-3	We assumed this swap in connection with the purchase of the Duke Portfolio on March 1, 2013. This swap is considered a hedging instrument under ASC 815-20 as of September 30, 2013. The swap was not considered a hedging instrument under ASC 815-20 during the period from March 1, 2013 to March 31, 2013.
	-4	We entered into these swaps in connection with the origination of the TD Term Loan and WF Term Loan #1 in March 2013. These swaps are considered hedging instruments under ASC 815-20 as of September 30, 2013. These swaps were not considered hedging instruments under ASC 815-20 during the period from March 11, 2013 and March 12, 2013, respectively, to May 29, 2013.
	-5	We terminated this interest rate swap in May 2013.
	We record all derivative instruments on a gross basis in the condensed consolidated balance sheets. Accordingly, there are no offsetting amounts that net assets against liabilities. The asset and liability balances presented in the table below reflects the gross amounts of derivatives recorded in the condensed consolidated balance sheets.
		Asset Derivatives										Liability Derivatives
				Fair value									Fair value
	Type of Instrument	Balance Sheet Location		30-Sep-13				31-Dec-12				Balance Sheet Location	30-Sep-13			31-Dec-12
	Derivatives designated as hedging instruments
	Interest Rate Swaps	Prepaid Expenses and Other Assets		$	2,925			$	—			Accounts Payable, Accrued Expenses and Other Liabilities	$	6,154		$	1,015
	Derivatives not designated as hedging instruments
	Interest Rate Swaps	Prepaid Expenses and Other Assets		$	—			$	—			Accounts Payable, Accrued Expenses and Other Liabilities	$	9		$	423
	The table below presents the effect of our derivative instruments on our condensed consolidated statement of operations for the three and nine months ended September 30, 2013 and 2012 (in thousands).
		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2013				2012				2013			2012
	Derivatives Designated as Cash Flow Hedges:
	Gain (Loss) Recognized in Other Comprehensive Income (OCI) (Effective Portion)	$	6,987			$	(1,142	)		$	3,598		$	(4,731	)
	Loss Reclassified from AOCI into Interest Expense (Effective Portion)	(858		)		(1,027		)		(1,693		)	(3,068		)
	Gain (Loss) Recognized in Gain from Interest Rate Swaps (Ineffective Portion and Amount Excluded from Effectiveness Testing)	(32		)		(494		)		(38		)	(506		)
	Amount of Gain on Derivatives Recognized in Earnings Under Gain from Interest Rate Swaps	221				134				1,381			380
	Loss Recognized in Loss on Conversion of Equity Interest to Controlling Interest	(1,414		)		—				(1,414		)	—
	Derivatives Not Designated as Cash Flow Hedges:
	Realized and Unrealized Gain Recognized in Gain from Interest Rate Swaps	$	76			$	(55	)		$	388		$	(145	)
	At September 30, 2013, the Company expects that the hedged forecasted transactions, for each of the outstanding qualifying cash flow hedging relationships remains probable of occurring and that no gains or losses recorded to accumulated other comprehensive loss are expected to be reclassified to earnings.
	Concentration of Credit Risk
	Our credit risk relates primarily to cash, restricted cash, and interest rate swap agreements. Cash accounts at each U.S. institution are insured by the Federal Deposit Insurance Corporation up to $250,000 through December 31, 2013.
	We have not experienced any losses to date on our invested cash and restricted cash. The interest rate swap agreements create credit risk. Credit risk arises from the potential failure of counterparties to perform in accordance with the terms of their contracts. Our risk management policies define parameters of acceptable market risk and limit exposure to credit risk. Credit exposure resulting from derivative financial instruments is represented by their fair value amounts, increased by an estimate of potential adverse position exposure arising from changes over time in interest rates, maturities, and other relevant factors. We do not anticipate nonperformance by any of our counterparties.
	Our consolidated properties are located throughout the United States and in the United Kingdom. The ability of the tenants to honor the terms of their respective leases is dependent upon the economic, regulatory, and social factors affecting the communities in which the tenants operate. In addition, we do not have any tenant whose rents exceeds 10% of our total rental revenue.

Future_Minimum_Rents

Future Minimum Rents	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Future Minimum Rents	'
	8. Future Minimum Rents
	The following is a schedule of future minimum rents to be received on non-cancelable operating leases from consolidated properties as of September 30, 2013 (in thousands):
	Remaining 2013	$	51,111
	2014	202,674
	2015	197,443
	2016	177,573
	2017	161,794
	2018	152,192
	Thereafter	502,173
		$	1,444,960

Related_Party_Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2013
Related Party Transactions [Abstract]	'
Investment Management and Other Fees to Related Parties	'
	Related Party Transactions
	Prior to July 1, 2012, all of our business activities were managed by the former investment advisor pursuant to the fourth amended and restated advisory agreement ("Fourth Amended Advisory Agreement"), which terminated according to its terms on June 30, 2012. Effective July 1, 2012, we entered into the Transitional Services Agreement and the former investment advisor pursuant to which the former investment advisor would provide certain consulting related services to us at the direction of our officers and other personnel for a term which ended on April 30, 2013. As part of the Transitional Services Agreement, we paid $2.5 million on the effective date of the agreement to reimburse the former investment advisor for expenses incurred related to personnel costs. In addition, during 2013, we paid $0.7 million to the former investment advisor as a final settlement of the Transitional Services Agreement.
	Pursuant to the Transitional Services Agreement, for services provided to us in connection with the investment management of our assets, the former investment advisor was paid an investment management consulting fee payable in cash consisting of (i) a monthly fee equal to one-twelfth of 0.5% of the aggregate cost (before non-cash reserves and depreciation) of all real estate investments within our portfolio and (ii) a monthly fee equal to 5.0% of the aggregate monthly net operating income derived from all real estate investments within our portfolio, subject to certain adjustments. For services provided to us in connection with the acquisition of assets, the former investment advisor or its affiliates was paid acquisition fees up to 1.5% of (i) the contract purchase price of real estate investments acquired by us, or (ii) when we make an investment indirectly through another entity, such investment's pro rata share of the gross asset value of real estate investments held by that entity. The total of all acquisition consulting fees payable with respect to real estate investments did not exceed an amount equal to 6% of the contract purchase price (or 6% of funds advanced with respect to mortgages) provided, however, that a majority of the uninterested members of the Board of Trustees could approve amounts in excess of this limit.
	Previously, pursuant to the Fourth Amended Advisory Agreement and the Transitional Services Agreement, the former investment advisor and its affiliates performed services relating to property management, leasing, construction supervision and management, and brokerage services.
	The various fees paid to the former investment advisor are summarized in the table below for the indicated periods (in thousands):
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Investment Management Fees	$	—	$	5,159	$	489	$	17,270
	Transition Services Agreement Fees	—		2,500		686		2,500
	Acquisition-Related Fees	—		944		1,472		2,061
	Property Management Fees (1)	288		396		808		1,168
	Leasing Commissions (1)	154		292		693		581
	Construction Supervision and Management Fees (1)	—		246		871		803
	Brokerage Fees(2)	—		203		—		203
	Other	—		—		—		26
	Total	$	442	$	9,740	$	5,019	$	24,612
	__________
	-1	Such fees for each service ranged from 2.0% to 5.0% of gross revenues received from a property that we owned.
	-2	The brokerage fee upon the sale of properties was an amount equal to the lesser of (i) one-half of the competitive real estate commission or (ii) 3% of the sales price of each property sold. The total brokerage commission paid did not exceed the lesser of the competitive real estate commission or an amount equal to 6% of the sales price of the property.
	As required by the Transitional Services Agreement, we and the former investment advisor have agreed on a list of unacquired real estate investments for which the former investment advisor has performed certain acquisition related consulting services prior to the termination of the Transitional Service Agreement (a "Qualifying Property"). If any Qualifying Property is acquired by us within the nine months following the termination of the Transitional Services Agreement then we shall pay an acquisition consulting fee equal to 0.75% of (i) the contract purchase price of the real estate investments (including debt), or (ii) when we make an investment indirectly through another entity, such investment's pro rata share of the gross asset value of real estate investments held by that entity to the former investment advisor. Real estate investments for which there is a dispute as to whether it is a Qualifying Property that are acquired within the nine months following the termination of the Transitional Services Agreement will be submitted to arbitration. As of September 30, 2013, we have not acquired any Qualifying Property.
	As of September 30, 2013, $0.1 million of amounts due to the former investment advisor for third party management fees was included in accounts payable, accrued expenses and other liabilities in the accompanying condensed consolidated balance sheets. All outstanding investment advisor-related fees have been paid as of September 30, 2013. As of December 31, 2012, $11.1 million of amounts due to the former investment advisor was included in accounts payable, accrued expenses and other liabilities in the accompanying condensed consolidated balance sheets.
	Class B Interest
	For a discussion of the Class B Interest owned by an affiliate of our former investment advisor, see Note 10 below.

NonControlling_Interest

Non-Controlling Interest	9 Months Ended
	Sep. 30, 2013
Noncontrolling Interest [Abstract]	'
Non-Controlling Interest	'
	Non-Controlling Interests
	Non-Controlling Interest Operating Partnership Units
	As of September 30, 2013, we owned 100% of the Class A limited partnership units of CSP OP. As of December 31, 2012 and September 30, 2012, we owned 99.90% of the Class A limited partnership units of CSP OP. The remaining 0.10% Class A limited partnership units of CSP OP, as of December 31, 2012 and September 30, 2012, were owned by REIT Holdings in the form of 246,361 Class A limited partnership units, which were exchangeable for cash or, at the Company’s discretion, on a one for one basis for common shares of the Company.
	On August 19, 2013, we redeemed for cash 246,361 Class A limited partnership units for $2.2 million, which were owned by REIT Holdings. In connection with the redemption, certain of the Company's officers and employees received a cash distribution from REIT Holdings with respect to their distribution interests they held in REIT Holdings.
	Class B Interest
	In exchange for services provided to the Company with respect to its formation and subsequent operations, REIT Holdings was granted the Class B Interest in CSP OP, the terms of which are more fully described in the third amended and restated agreement of limited partnership of CSP OP (the "Third Amended Partnership Agreement"). REIT Holdings is an affiliate of the former investment advisor and certain of the Company’s officers and employees own distribution interests in REIT Holdings. A mandatory redemption of the Class B Interest by CSP OP was triggered by the Listing.
	The consideration (if any) to be received by REIT Holdings for the Class B Interest ("Consideration") will be 15% of the total market value of the Company’s listed common shares above a threshold amount (the "Class B Return Threshold") equal to (i) the total capital contributions made to CSP OP by us and (ii) a 7% annual, uncompounded return on such capital contributions. The calculation of the Consideration (if any) will be based upon the total number of our listed common shares multiplied by the average per share closing price of our common shares for the 30 day period (the "30-Day Market Value") beginning on October 19, 2013, which is the 151st day after the Listing, and ending on November 17, 2013, which is the 180th day after the Listing. The Consideration (if any) will therefore be 15% of the amount by which the 30-Day Market Value exceeds the Class B Return Threshold. The Company currently estimates the Class B Return Threshold to be an amount equal to the total number of our listed common shares multiplied by approximately $10.13 per share. If, however, the 30-Day Market Value does not exceed the Class B Return Threshold, the Class B interest will be redeemed at no cost and will no longer be outstanding. Consideration (if any) will be paid within 10 business days of the determination of the 30-Day Market Value, and may be in the form of cash or common shares as determined by the Company’s Board of Trustees.
	As a result of the modification of the terms of the Class B Interest pursuant to the Third Amended Partnership Agreement, it was no longer required that the Class B Interest be redeemed or forfeited upon a termination of the former investment advisor as investment advisor to us. Consequently, we recognized an expense of $0.2 million during the year ended December 31, 2012 for the current economic fair value resulting from the modification of the terms of the Class B Interest.

Equity_Incentive_Plan_and_Perf

Equity Incentive Plan and Performance Bonus Plan	9 Months Ended
	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Equity Incentive Plan and Performance Bonus Plan	'
	Equity Incentive Plan and Performance Bonus Plan
	Equity Incentive Plan
	At our annual shareholders' meeting held on May 31, 2013, our shareholders approved the 2013 equity incentive plan. A description of the material terms of the 2013 equity incentive plan, as well as a copy of the 2013 equity incentive plan, were included in our definitive proxy statement on Schedule 14A filed with the SEC on April 12, 2013. Our key employees, directors, trustees, officers, advisors, consultants or other personnel of ours and our subsidiaries or other persons expected to provide significant services to us or our subsidiaries would be eligible to be granted incentive share options, non-qualified share options, share appreciation rights, restricted shares, restricted share units, dividend equivalent rights and other equity-based awards as contemplated in the 2013 equity incentive plan. As of September 30, 2013, there were 4,597,500 common shares available for grant under the 2013 equity incentive plan.
	On February 7, 2013, our Board's independent trustees, Messrs. Black, Orphanides and Salvatore, were awarded equity grants under the amended and restated 2004 equity incentive plan on the following terms: (i) (x) Mr. Black's award was for $100,000 in common shares and (y) Messrs. Orphanides and Salvatore each were awarded $25,000 in common shares for a total of $150,000; and (ii) each award vested in its entirety, upon issuance.
	On March 15, 2013, a total of 281,625 restricted common shares were granted to our named executive officers (Messrs. Cuneo, Kianka and Reid) based on each executive's achievement of performance objectives during 2012, as determined at the discretion of our Compensation Committee. Additionally, 21 of our employees were granted 117,300 restricted common shares, in the aggregate, on March 15, 2013. One-third of the restricted shares granted to our named executive officers and employees will vest in each of the first three anniversaries of grant if the grantee is employed by the Company on such anniversary. Compensation expense is recognized on a straight-line basis over the service vesting period of three years and takes into consideration an estimated forfeiture rate of 5%. We recognized share-based compensation expense of $316,000 and $684,000 during the three and nine months ended September 30, 2013 as a result of granting the awards to our named executive officers and our employees.
	As a result of the Listing on May 21, 2013, a total of 375,000 common shares were awarded to our named executive officers (Messrs. Cuneo, Kianka and Reid) and other members of our senior management. These shares fully vested on July 10, 2013. Additionally, on July 10, 2013, other employees were granted a total of 27,500 common shares as a result of the Listing as determined by the compensation committee of our Board of Trustees. These shares fully vested on July 10, 2013. We incurred $3.8 million in share-based compensation in connection with the Listing which is included in Transition and Listing expenses in the accompanying condensed consolidated statements of operations for the nine months ended September 30, 2013.
	Summary of Time-Based Restricted Common Shares
	A summary of our Time-Based Restricted Common Shares from January 1, 2013 through September 30, 2013 is presented below:
		Nonvested
		Shares		Weighted-Average			Vested
				Grant Date
				Fair Value
				per Share
	Outstanding at January 1, 2013	300,000		$	10		—
	Granted	398,925		10			—
	Vested	(100,000	)	10			100,000
	Canceled (1)	—		—			(33,515	)
	Outstanding as of September 30, 2013	598,925		$	10		66,485
	__________
	-1	33,515 common shares were tendered in accordance with the terms of the 2013 equity incentive plan to satisfy minimum state tax withholding requirements related to the restricted common shares that have vested. We accept the return of shares at the current quoted closing share price of the Company's common shares on the NYSE to satisfy tax obligations.
	Summary of Performance-Based Restricted Common Shares
	A summary of Performance-Based Restricted Common Shares from January 1, 2013 through September 30, 2013 is presented below:
		Nonvested
		Shares		Weighted-Average			Vested
				Grant Date
				Fair Value
				per Share
	Outstanding January 1, 2013	375,000		$	10		—
	Granted	27,500		8.9			—
	Vested	(402,500	)	9.92			402,500
	Canceled (1)	—		—			(144,563	)
	Outstanding as of September 30, 2013	—		$	—		257,937
	-1	144,563 common shares were tendered in accordance with the terms of the 2013 equity incentive plan to satisfy minimum state tax withholding requirements related to the restricted common shares that have vested. We accept the return of shares at the current quoted closing share price of the Company's common shares on the NYSE to satisfy tax obligations.
		2013			2012
	Compensation Expense Recorded During the Nine Months ended September 30(1)	$	5,354		$	215
	Unamortized Compensation Costs	$	4,998		$	6,398
	Units Available for the Future Awards(2)	4,597,500			19,298,000
	__________
	-1	Compensation Expense includes expenses incurred in our Listing Expense totaling $3.8 million.
	-2	Units available for the future awards includes units under the 2013 equity incentive plan, which was the successor to the amended and restated 2004 equity incentive plan.

Shareholders_Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Shareholders' Equity	'
	Shareholders' Equity
	Common Shares
	Under our current declaration of trust, we have the authority to issue a total of 1,000,000,000 shares of beneficial interest. Of the total shares authorized, 990,000,000 shares are designated as common shares, with a par value of $0.01 per share, and 10,000,000 shares are designated as preferred shares, with a par value of $0.01 per share.
	On May 21, 2013, we listed our common shares on the NYSE under the symbol "CSG" (the "Listing") and concurrently commenced the $125.0 million Tender Offer from our shareholders. As a result of the Tender Offer, on June 26, 2013, we accepted for purchase 12,376,235 common shares at a purchase price of $10.10 per share, for an aggregate cost of approximately $125.0 million, excluding fees and expenses relating to the Tender Offer.
	In connection with the Listing, we terminated the dividend reinvestment plan effective as of the close of business on May 21, 2013. As of the close of business on May 21, 2013, we had issued a total of 8,869,829 common shares pursuant to the dividend reinvestment plan, and received approximately $84.3 million in gross proceeds.
	In connection with the Listing, we terminated our former share redemption program effective as of the close of business on May 21, 2013. During the nine months ended September 30, 2013 and 2012, we repurchased 4,996,936 common shares and 3,841,599 common shares, respectively, under our former share redemption program for $47.4 million and $35.9 million, respectively.
	On July 8, 2013, we eliminated all outstanding fractional common shares (the "Fractional Shares") by paying each holder of a Fractional Share an amount in cash equal to the fraction of a share being repurchased multiplied by the closing price of our common shares on the NYSE, as of the date of payment, rounded up to the nearest cent.
	On August 4, 2013, our Board of Trustees determined that, beginning in the fourth quarter of 2013, we will transition from quarterly distributions to paying distributions on a monthly basis as calculated pursuant to monthly record dates and distribution declaration dates.
	Accumulated Other Comprehensive Income (Loss)
	The following presents the changes in the balances of each component of accumulated other comprehensive income (loss) for the nine months ended September 30, 2013 and 2012 (in thousands):
		Foreign Currency			Swap Fair Value			Accumulated
		Translation Loss			Adjustment			Other
								Comprehensive Loss
	Balance at January 1, 2013	$	(6,164	)	$	(2,423	)	$	(8,587	)
	Other Comprehensive Income (Loss) Before Reclassifications	2,955			(2,188		)	767
	Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	—			1,693			1,693
	Balance at September 30, 2013	$	(3,209	)	$	(2,918	)	$	(6,127	)
		Foreign Currency			Swap Fair Value			Accumulated
		Translation Loss			Adjustment			Other
								Comprehensive Loss
	Balance at January 1, 2012	$	(10,579	)	$	(13,085	)	$	(23,664	)
	Other Comprehensive Income (Loss) Before Reclassifications	1,036			(2,438		)	(1,402		)
	Balance at September 30, 2012	$	(9,543	)	$	(15,523	)	$	(25,066	)

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments and Investments	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value of Financial Instruments and Investments	'
	Fair Value of Financial Instruments and Investments
	We apply the three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices for identical financial instruments in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as instruments that have little to no pricing observability as of the reported date. These financial instruments do not have two-way markets and are measured using management’s best estimate of fair value, where the inputs into the determination of fair value require significant management judgment or estimation. We have classified the debt secured by Albion Mills Retail Park as Level 3 as of September 30, 2013 and December 31, 2012 due to the lack of current market activity and our reliance on unobservable inputs to estimate the fair value of the mortgage note payable.
	As of September 30, 2013 and December 31, 2012, we held certain items that were required to be measured at fair value on a recurring basis. These included cash equivalents, interest rate swap derivative contracts and our equity method investment in CBRE Strategic Partners Asia. Cash equivalents consist of short-term, highly liquid, income-producing investments, all of which have maturities of 90 days or less, including money market funds and U.S. Government obligations. Derivative instruments are related to our economic hedging activities with respect to interest rates.
	The fair values of the interest rate swap derivative agreements are estimated with the assistance of a third-party valuation specialist, as reviewed by the Vice President-Accounting, using the market standard methodology of discounting the future expected cash payments and receipts on the pay and receive legs of the interest rate swap agreements that swap the estimated variable rate mortgage note payment stream for a fixed rate receive payment stream over the period of the loan. The variable interest rates used in the calculation of projected receipts on the interest rate swap agreements are based on an expectation of future interest rates derived from observable market interest rate curves and volatilities. We incorporate credit valuation adjustments to appropriately reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements (where appropriate). Although we have determined that the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by us and our counterparties. However, as of September 30, 2013 and December 31, 2012, we have assessed the significance of the impact of the credit valuation adjustments on the overall valuation and have determined that the credit valuation adjustments are not significant to the overall valuation of our derivatives. As a result, we have determined that our derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. We have consistently applied these valuation techniques in all periods presented and believe we have obtained the most accurate information available for the types of derivative contracts we hold.
	Our investment in CBRE Strategic Partners Asia is based on the Level 3 valuation inputs applied by the Investment Manager of this investment company utilizing a mix of different approaches for valuing the underlying real estate related investments within the investment company. The approaches include the income approach, direct market comparison approach and the replacement cost approach for newer properties. For investments owned more than one year, except for investments under construction or incurring significant renovation, it is CBRE Strategic Partners Asia’s policy to obtain a third-party appraisal. For investments in real estate under construction or incurring significant renovation, the valuation analysis is prepared by the Investment Manager.
	The following items are measured at fair value on a recurring basis at September 30, 2013 and December 31, 2012 (in thousands):
		As of September 30, 2013
						Fair Value Measurements Using:
		Total				Quoted				Significant			Significant
		Fair Value				Markets				Observable			Unobservable
						Prices				Inputs			Inputs
						(Level 1)				(Level 2)			(Level 3)
	Financial Assets (Liabilities)
	Cash and Cash Equivalents	$	5,568			$	5,568			$	—		$	—
	Interest Rate Swap Not Designated as Cash Flow Hedge	(9		)		—				(9		)	—
	Interest Rate Swaps Designated as Cash Flow Hedges - Assets	2,925				—				2,925			—
	Interest Rate Swaps Designated as Cash Flow Hedges - Liabilities	(6,154		)		—				(6,154		)	—
	Investment in CBRE Strategic Partners Asia	9,425				—				—			9,425
	Secured Notes Payable - Albion Mills	(9,338		)		—				—			(9,338		)
	Class B Interest	(200		)		—				—			(200		)
		As of December 31, 2012
						Fair Value Measurements Using:
		Total				Quoted				Significant			Significant
		Fair Value				Markets				Observable			Unobservable
						Prices				Inputs			Inputs
						(Level 1)				(Level 2)			(Level 3)
	Financial Assets (Liabilities)
	Cash and Cash Equivalents	$	6,495			$	6,495			$	—		$	—
	Interest Rate Swaps Not Designated as Cash Flow Hedge	(423		)		—				(423		)	—
	Interest Rate Swaps Designated as Cash Flow Hedges	(1,015		)		—				(1,015		)	—
	Investment in CBRE Strategic Partners Asia	8,098				—				—			8,098
	Secured Notes Payable - Albion Mills	(9,288		)		—				—			(9,288		)
	Class B Interest	(200		)		—				—			(200		)
	The following table presents our activity for the variable rate note payable and our investment in CBRE Strategic Partners Asia measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the nine months ended September 30, 2013 and 2012, respectively (in thousands):
	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)		Investment in				Secured notes payable - Albion Mills
			CBRE Strategic
			Partners Asia
	Balance at January 1, 2013		$	8,098			$	(9,288	)
	Contributions		—				—
	Distributions		—				—
	Total Income (Loss) on Fair Value Adjustment		1,327				(78		)
	Translation Adjustment in Other Comprehensive Income		—				28
	Balance as of September 30, 2013		$	9,425			$	(9,338	)
	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)		Investment in				Secured notes payable - Albion Mills
			CBRE Strategic
			Partners Asia
	Balance at January 1, 2012		$	8,381			$	(8,775	)
	Contributions		2,029				—
	Distributions		(2,400		)		—
	Total Loss on Fair Value Adjustment		(231		)		(85		)
	Translation Adjustment in Other Comprehensive Income		—				(348		)
	Balance at September 30, 2012		$	7,779			$	(9,208	)
	Gains and losses (realized and unrealized) included in earnings related to the interest rate swaps, as well as for the elected fair value note payable for the three and nine months ended September 30, 2013 and 2012, respectively, are reported as components of "Other Income and Expense" on the consolidated statements of operations.
	Disclosure of Fair Value Financial Instruments
	For disclosure purposes only, the following table summarizes our notes payable and their estimated fair value at September 30, 2013 and December 31, 2012 (in thousands):
			Book Value								Fair Value
	Financial Instrument		September 30,				December 31,				September 30,			December 31,
			2013				2012				2013			2012
	Secured Notes Payable(1)		$	685,341			$	492,944			$	732,794		$	514,451
	Secured Notes Payable - Albion Mills(1)		9,338				9,288				9,338			9,288
	Total Secured Notes Payable(1)		$	694,679			$	502,232			$	742,132		$	523,739
	Unsecured Term Loan Facilities(1)		$	570,000			$	—			$	570,000		$	—
	Unsecured Revolving Credit Facility(1)		$	100,000			$	265,000			$	100,000		$	265,000
__________
-1	Level 3: For purposes of this fair value disclosure, we based our fair value estimate for notes payable on our internal valuation that includes a representative sample of our lenders’ market interest rate quotes as of September 30, 2013 and December 31, 2012 for debt with similar risk characteristics and maturities. We based our notes payable secured by our Albion Mills property carried at fair value on a third party appraiser’s valuation, which used similar techniques as our internal valuation model as of September 30, 2013 and December 31, 2012.
These financial instruments do not have two-way markets and are measured using management’s best estimate of fair value, where the inputs into the determination of fair value require significant management judgment or estimation. We have classified the notes payable secured by Albion Mills as Level 3 as of September 30, 2013 and December 31, 2012 due to the lack of current market activity and our reliance on unobservable inputs to estimate the fair value of the debt.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	On June 13, 2013, the European JV entered into a purchase and sale agreement to acquire, subject to customary closing conditions, Lauwin-Planque Distribution Center ("Lille"), located in Lille, France. The European JV will acquire Lille for approximately €51.2 million, (approximately $69.6 million assuming an exchange rate of €1.00: $1.36 or $55.7 million at our 80% pro rata share), exclusive of customary closing costs. We own an 80% interest in the joint venture and Goodman owns a 20% interest. We expect to fund our pro rata share of the acquisition using borrowings under our unsecured revolving credit facility. Lille, scheduled to be completed in the fourth quarter of 2013, will be a 774,526 square foot fulfillment center that is 100% leased to Amazon.fr Logistique for twelve years with 100% annual CPI adjustments (capped at 3%). The lease is guaranteed by Amazon EU s.a.r.l., the principal operating subsidiary of Amazon.com, Inc. in continental Europe. While the European JV expects this acquisition to close during the fourth quarter of 2013, the agreement to acquire the property is subject to certain contingencies and there can be no assurance that the acquisition will occur.
	Ground Leases - We own a property that is subject to a long-term noncancellable ground lease obligation that contractually expires on November 30, 2032. We have three ten-year renewal options that will allow us to extend the expiration of the ground lease through November 30, 2062. The minimum commitment under the ground lease as of September 30, 2013 and thereafter is as follows:
	Remaining 2013	$	61
	2014	273
	2015	273
	2016	273
	2017	273
	2018	276
	Thereafter	4,782
		$	6,211
	Litigation—From time to time, we and our properties may be subject to legal proceedings, which arise in the ordinary course of our business. Currently, neither our company nor any of our properties are subject to, or threatened with, any legal proceedings for which the outcome is reasonably likely to have a material adverse effect on our financial statements.
	Environmental Matters—We are not aware of any material environmental liability or any unasserted claim or assessment with respect to a material environmental liability that we believe would require additional disclosure or the recording of a loss contingency.

Segment_Disclosure

Segment Disclosure	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Segment Disclosure	'
	Segment Disclosure
	Our reportable segments consist of three types of commercial real estate properties, namely, Domestic Industrial Properties, Domestic Office Properties and International Office/Retail Properties. Management internally evaluates the operating performance and financial results of our segments based on net operating income. We also have certain general and administrative level activities including legal, accounting, tax preparation and shareholder servicing costs that are not considered separate operating segments.
	We evaluate the performance of our segments based on net operating income, defined as: rental income and tenant reimbursements less property and related expenses (operating and maintenance and real estate taxes) and excludes other non-property income and expenses, interest expense, depreciation and amortization, and corporate general and administrative expenses.
	The following table compares the net operating income for the three and nine months ended September 30, 2013 and 2012 (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Domestic Industrial Properties
	Revenues:
	Rental	$	13,729		$	11,880		$	40,792		$	31,645
	Tenant Reimbursements	3,475			2,077			12,331			6,995
	Total Revenues	17,204			13,957			53,123			38,640
	Property and Related Expenses:
	Property Operating	1,009			842			3,175			2,524
	Real Estate Taxes	3,452			2,086			11,092			6,127
	Total Property and Related Expenses	4,461			2,928			14,267			8,651
	Net Operating Income	$	12,743		$	11,029		$	38,856		$	29,989
	Domestic Office Properties
	Revenues:
	Rental	$	35,683		$	24,230		$	100,279		$	72,862
	Tenant Reimbursements	10,615			6,996			27,499			18,314
	Total Revenues	46,298			31,226			127,778			91,176
	Property and Related Expenses:
	Property Operating	7,345			4,062			19,075			13,214
	Real Estate Taxes	6,477			4,666			17,618			11,411
	Total Property and Related Expenses	13,822			8,728			36,693			24,625
	Net Operating Income	$	32,476		$	22,498		$	91,085		$	66,551
	International Office/Retail Properties
	Revenues:
	Rental	$	1,750		$	1,870		$	5,242		$	5,359
	Tenant Reimbursements	88			94			258			257
	Total Revenues	1,838			1,964			5,500			5,616
	Property and Related Expenses:
	Property Operating	271			244			422			744
	Real Estate Taxes	—			—			—			—
	Total Property and Related Expenses	271			244			422			744
	Net Operating Income	$	1,567		$	1,720		$	5,078		$	4,872
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Reconciliation to Consolidated Net Income (Loss)
	Total Segment Net Operating Income	$	46,786		$	35,247		$	135,019		$	101,412
	Expenses:
	General and Administrative	5,397			7,162			17,710			10,973
	Investment Management Fee	—			5,159			489			17,270
	Acquisition-related Expenses	175			1,099			2,179			2,508
	Depreciation and Amortization	26,635			18,787			75,409			54,749
	Transition and Listing Expenses	1,447			6,216			12,681			8,152
		13,132			(3,176		)	26,551			7,760
	Other Income and Expenses
	Interest and Other Income	551			229			1,028			1,714
	Interest Expense	(13,120		)	(8,737		)	(33,953		)	(26,528		)
	Gain on Interest Rate Swaps	265			134			1,731			380
	Loss on Early Extinguishment of Debt	(1,572		)	(1,686		)	(1,572		)	(1,686		)
	(Loss) Gain on Conversion of Equity Investment to Controlling Interest	(1,667		)	—			75,535			—
	(Loss) Income from Continuing Operations Before Provision for Income Taxes and Equity in Income of Unconsolidated Entities	(2,411		)	(13,236		)	69,321			(18,361		)
	Provision for Income Taxes	(54		)	(75		)	(274		)	(217		)
	Equity in Income of Unconsolidated Entities	3,324			927			10,263			2,556
	Net Income (Loss) from Continuing Operations	859			(12,384		)	79,310			(16,022		)
	Discontinued Operations
	Realized Loss from Sale	—			—			—			(415		)
	Loss From Discontinued Operations	—			—			—			(415		)
	Net Income (Loss)	$	859		$	(12,384	)	$	79,310		$	(16,437	)
	September 30,			December 31,
Condensed Assets	2013			2012
Domestic Industrial Properties	$	743,776		$	678,930
Domestic Office Properties	1,616,881			1,077,328
International Office/Retail Properties	103,396			105,502
Non-Segment Assets (1)	527,104			616,276
Non-Segment Construction in Progress and Other Assets—Variable Interest Entity	—			76,826
Total Assets	$	2,991,157		$	2,554,862
(1) Non-segment assets primarily include our investments in unconsolidated entities.

Earnings_Per_Share_Attributabl

Earnings Per Share Attributable to Common Shareholders	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share Attributable to Common Shareholders	'
	Earnings per Share Attributable to Common Shareholders
	The following table reconciles the numerator and denominator in computing the Company's basic and diluted per-share computations for net income (loss) available to common shareholders for three and nine months ended September 30, 2013 and 2012 is as follows (in thousands except share data):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Numerator:
	Income (Loss) from Continuing Operations	$	859		$	(12,384	)	$	79,310		$	(16,022	)
	(Income) Loss from Continuing Operations Attributable to Noncontrolling Interests	(3		)	5			(83		)	7
	Allocation to Participating Securities (Nonvested Time-Based Shares)	(75		)	(45		)	(285		)	(45		)
	Numerator for Basic and Diluted Income (Loss) from Continuing Operations	781			(12,424		)	78,942			(16,060		)
	Loss from Discontinued Operations	—			—			—			(415		)
	Numerator for Basic and Diluted Income (Loss) Available to Common Shareholders	$	781		$	(12,424	)	$	78,942		$	(16,475	)
	Denominator:
	Basic Weighted Average Vested Shares Outstanding	236,548,477			249,173,577			244,373,249			247,718,798
	Effect of Dilutive Securities - Performance-Based Shares (1)	—			—			—			—
	Diluted Weighted Average Vested Shares Outstanding	236,548,477			249,173,577			244,373,249			247,718,798
	Basic and Diluted Earnings Per Share:
	Income (Loss) from Continuing Operations Available to Common Shareholders per Share	$	0		$	(0.05	)	$	0.32		$	(0.07	)
	Income (Loss) from Discontinued Operations Available to Common Shareholders per Share	$	0		$	0		$	0		$	0
	Net Income (Loss) Available to Common Shareholders per Share	$	0		$	(0.05	)	$	0.32		$	(0.07	)
	__________
	-1	375,000 performance-based shares granted in September 2012 and subsequently vested in May 2013 are not included in the diluted weighted average share calculations for the three and nine months ended September 30, 2012 because the effect would be anti-dilutive.

Subsequent_Events

Subsequent Events	9 Months Ended
	Sep. 30, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent Events
	On October 9, 2013, we paid off the Albion Mills Retail Park loan in the amount of approximately £5.8 million (approximately $9.3 million). The interest rate swap agreement terminated with the loan payoff.
	On October 10, 2013, we contributed $40.7 million to the Duke JV for our 80% share of the payoff (inclusive of accrued interest) of two fixed rate mortgage notes that were cross-collateralized and secured by the following properties: AllPoints Midwest Bldg.1 and 125 Enterprise Parkway. The notes were paid in full by the joint venture on October 11, 2013 for the total remaining principal balance of $50.8 million.
	On November 6, 2013, we filed an automatically effective shelf registration statement on Form S-3 with the SEC to facilitate periodic public offerings of our securities.
	On November 6, 2013, we and CSP OP entered into four separate Equity Distribution Agreements with certain sales agents, pursuant to which we may sell, from time to time, our common shares having an aggregate offering price of up to $250.0 million. Sales of our common shares may be made in ordinary brokers’ transactions on the NYSE, in negotiated transactions or transactions that are deemed to be “at the market” offerings, including sales made to or through a market maker other than on an exchange, at prices related to the prevailing market prices or at negotiated prices.
	On November 7, 2013, the Duke JV sold 533 Maryville Centre and 555 Maryville Centre, each located in St. Louis, MO for approximately $39.2 million, exclusive of customary closing costs. Our pro rata share of the net proceeds of the sale following loan satisfaction and payment of customary closing expenses was approximately $11.0 million.

Basis_of_Presentation_and_Summ1

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation and Principles of Consolidation
	The accompanying condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles ("U.S. GAAP") and reflect the accounts of the Company, CSP OP and its consolidated subsidiaries. The Company consolidates its wholly-owned properties and joint ventures it controls through either 1) voting rights or similar rights or 2) by means other than voting rights if the Company is deemed to be the primary beneficiary of a variable interest entity. All significant intercompany accounts and transactions are eliminated in consolidation.
	Certain information and footnotes required for annual financial statement presentation have been condensed or excluded pursuant to Securities and Exchange Commission (the "SEC") rules and regulations. Accordingly, our interim financial statements do not include all of the information and disclosures required under U.S. GAAP for complete financial statements. In the opinion of management, all adjustments of a normal recurring nature considered necessary in all material respects to present fairly our financial position, results of our operations and cash flows as of and for the three and nine months ended September 30, 2013 have been made. The results of operations for the three and nine months ended September 30, 2013 are not necessarily indicative of the results of operations to be expected for the entire year. The condensed consolidated financial statements and notes thereto should be read in conjunction with our current Annual Report on Form 10-K, which contains the latest available audited consolidated financial statements and notes thereto, which are as of and for the year ended December 31, 2012.
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements, in conformity with U.S. GAAP, requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Segment Information	'
	Segment Information
	We currently operate our consolidated properties in two geographic areas, the United States and the United Kingdom. We view our consolidated property operations as three reportable segments, a Domestic Industrial segment, a Domestic Office segment and an International Office/Retail segment, which participate in the acquisition, development, ownership, and operation of high quality real estate in their respective segments.
Revenue Recognition and Valuation of Receivables	'
	Revenue Recognition and Valuation of Receivables
	All leases are classified as operating leases and minimum rents are recognized on a straight-line basis over the terms of the leases. The excess of rents recognized over amounts contractually due pursuant to the underlying leases is recorded as deferred rent. In connection with various leases, we have received irrevocable stand-by letters of credit totaling $15.2 million and $17.8 million as security for such leases at September 30, 2013 and December 31, 2012, respectively.
	Tenant receivables and deferred rent receivables are carried net of the allowances for uncollectible current tenant receivables and deferred rent. Management's determination of the adequacy of these allowances is based primarily upon evaluations of historical loss experience, individual receivables, current economic conditions, and other relevant factors. The allowances are increased or decreased through the provision for bad debts. The allowance for uncollectible rent receivable was $23,000 and $11,000 as of September 30, 2013 and December 31, 2012, respectively.
Translation of Non-U.S. Currency Amounts	'
	Translation of Non-U.S. Currency Amounts
	The financial statements and transactions of our United Kingdom real estate operation are recorded in their functional currency, namely the Great Britain Pound ("GBP") and are then translated into U.S. dollars ("USD").
	Assets and liabilities of this operation are denominated in the functional currency and are then translated at exchange rates in effect at the balance sheet date. Revenues and expenses are translated at the average exchange rate for the reporting period. Translation adjustments are reported in "Accumulated Other Comprehensive Loss," a component of Shareholders' Equity.
	The carrying value of our United Kingdom assets and liabilities fluctuate due to changes in the exchange rate between the USD and the GBP. The exchange rate of the USD to the GBP was $1.6186 and $1.6242 at September 30, 2013 and December 31, 2012, respectively. The profit and loss weighted average exchange rate of the USD to the GBP was approximately $1.5301 and $1.5755 for the three months ended September 30, 2013 and 2012, respectively; and $1.5449 and $1.5790 for the nine months ended September 30, 2013 and 2012, respectively.
	The carrying value of our assets and liabilities held within our joint venture in Europe (the "European JV") fluctuate due to changes in the exchange rate between the USD and the EUR. The exchange rate of the USD to the EUR was $1.3524 and $1.3189 at September 30, 2013 and December 31, 2012. The profit and loss weighted average exchange rate of the USD to the EUR was approximately $1.3175 and $1.2510 for the three months ended September 30, 2013 and 2012, respectively; and $1.3146 and $1.2859 for the nine months ended September 30, 2013 and 2012, respectively.
Transition Costs	'
	Transition and Listing Expenses
	We incurred certain costs in connection with our transition from being an externally managed company to a self-managed company ("Transition Costs"). These Transition Costs consist of legal, consulting and other third-party service provider costs incurred by us in order to execute on our Board of Trustees' decision to become a self-managed company. The Transition Costs included legal and consulting costs resulting from the amendment of our management structure and various corporate relationships, including with respect to our relations with the former investment advisor, exploring and implementing strategic alternatives for information technology, office space and personnel needs, among other expenses. The Transition Costs were primarily incurred during 2012, with the exception of $0.7 million incurred during 2013 as a final settlement of the Transition Services Agreement. Transition Costs of $6.2 million and $8.2 million were incurred during the three and nine months ended September 30, 2012, respectively.
Listing	'
	We incurred certain costs in connection with our Listing and our Tender Offer in 2013. These listing expenses consisted of legal, investment banking, share-based compensation, consulting and other third-party service provider costs incurred by us in order to complete our Listing and Tender Offer. Listing costs totaling $1.4 million and $11.9 million were incurred during the three and nine months ended September 30, 2013, respectively. Of the listing expenses incurred through September 30, 2013, $3.8 million was attributable to share-based compensation.
Income Taxes	'
	Income Taxes
	We elected to be taxed as a REIT under the Internal Revenue Code commencing with our taxable year ended December 31, 2004. To qualify as a REIT, we must meet a number of organizational and operational requirements, including a requirement that we generally distribute at least 90% of our REIT taxable income (determined without regard to the dividends paid deduction and excluding net capital gain). It is our current intention to adhere to these requirements and maintain our REIT qualification. As a REIT, we generally will not be subject to corporate level U.S. federal income tax on net income we distribute currently to our shareholders. If we fail to qualify as a REIT in any taxable year, then we will be subject to U.S. federal income taxes at regular corporate rates (including any applicable alternative minimum tax) and may not be able to qualify as a REIT for four subsequent taxable years. Even if we qualify for taxation as a REIT, we may be subject to certain state and local taxes on our income and property and to U.S. federal income and excise taxes on our undistributed taxable income, if any.
	ASC 740-10 Income Taxes requires recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements or tax returns. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial reporting and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. We did not have a liability for any unrecognized benefits as of September 30, 2013. The tax years from 2008 through 2012 remain open to examination by the taxing jurisdictions to which the company is subject.
	Included as a component of our tax provision, we have incurred income and other taxes (franchise, local and state government and international) related to our continuing operations in the amount of $54,000, $75,000, $0.3 million and $0.2 million during the three and nine months ended September 30, 2013 and 2012, respectively. The United Kingdom taxes real property operating results at a statutory rate of 20%. The United Kingdom taxable losses to date have generated a deferred tax asset of approximately $0.8 million consisting of these net operating loss carryforwards. We have provided for a full valuation allowance of $0.8 million as of September 30, 2013 on deferred tax assets because it is not likely that future operating profits in the United Kingdom would be sufficient to absorb the net operating losses.
Adoption of Accounting Standards	'
	New Accounting Standards
	In January 2013, the FASB issued ASU 2013-1, Clarifying the Scope of Disclosures About Offsetting Assets and Liabilities, which clarifies which instruments and transactions are subject to the offsetting disclosure requirements established by ASU 2011-11. The ASU clarifies that the scope applied to derivatives accounted for in accordance with the Derivatives and Hedging topic of the Codification, including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions that are either offset in accordance with the Offsetting Presentation section of the Balance Sheet topic or the Presentation section of the Derivatives and Hedging topic or subject to an enforceable master netting arrangement or similar agreement.
	In February 2013, the FASB issued ASU No. 2013-2, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income ("ASU 2013-2"). This update requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income.
	The ASU amendment and the subsequent clarification of the amendment are effective for periods beginning on or after January 1, 2013, and must be shown for all periods shown on the balance sheet. The adoption of these ASU amendments did not have a material effect on our financial condition, results of operations, or disclosures.

Investment_in_Real_Estate_Acti1

Investment in Real Estate Activity (Tables)	9 Months Ended
	Sep. 30, 2013
Real Estate [Abstract]	'
Schedule of Purchase Price Allocation to Assets and Liabilities Acquired	'
	The following table summarizes the preliminary allocation of the fair value of amounts recognized for each major class of assets and liabilities (in thousands):
	Land	$	60,473
	Building and Improvements	363,778
	Acquired In-Place Leases (1)	64,421
	Acquired Above-Market Leases (1)	21,084
	Total Acquired Assets	509,756
	Secured Notes Payable, Net (2)	229,539
	Acquired Below-Market Leases (3)	5,549
	Total Assumed Liabilities	235,088
	Fair Value of Acquired Net Assets (Represents 100% Interest)	$	274,668
	__________
	-1	Represents in-place leases with a weighted average amortization period of 6.84 years and above-market leases with a weighted average amortization period of 7.81 years.
	-2	Secured notes payable is presented net of a premium of $13.5 million.
	-3	Represents below-market leases with a weighted average amortization period of 7.83 years.
	The following table summarizes the preliminary allocation of the fair value of amounts recognized for each major class of assets and liabilities (in thousands):
			Carpenter Center			1200 Woods Chapel			Total
	Land		$	5,901		$	1,560		$	7,461
	Building and Improvements		35,950			7,357			43,307
	Acquired In-Place Leases (1)		7,795			1,237			9,032
	Acquired Above-Market Leases (1)		481			596			1,077
	Total Acquired Assets		50,127			10,750			60,877
	Acquired Below-Market Leases (2)		618			—			618
	Total Assumed Liabilities		618			—			618
	Net Assets Acquired		$	49,509		$	10,750		$	60,259
	__________
	-1	Represents in-place leases with a weighted average amortization period of 9.34 years and above-market leases with a weighted average amortization period of 7.56 years.
	-2	Represents below-market leases with a weighted average amortization period of 9.92 years.
Pro Forma Operations	'
	These unaudited pro forma results do not purport to be indicative of what operating results would have been had the acquisitions actually occurred on January 1, 2012 and may not be indicative of future operating results. (in thousands, except share data)
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Revenues	$	65,971		$	67,557		$	200,742		$	200,432
	Net Operating Income	13,687			2,595			32,366			23,945
	Net Income	1,411			(9,234		)	84,056			(7,773		)
	Basic and Diluted Income per Share	$	0.01		$	(0.04	)	$	0.34		$	(0.03	)
	The following table summarizes the results from continuing operations since the consolidation of the Duke Portfolio on March 1, 2013 through September 30, 2013 (in thousands). We previously included the results from operations of the Duke Portfolio in equity in earnings.
	Revenues	$	35,781
	Net income	$	499
	The following table summarizes the combined results from operations for Carpenter Center and 1200 Woods Chapel from July 31, 2013 and August 8, 2013, the respective dates of acquisition, through September 30, 2013 (in thousands):
	Revenues	$	876
	Net Income	$	254

Investments_in_Unconsolidated_1

Investments in Unconsolidated Entities (Tables)	9 Months Ended
	Sep. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]	'
Schedule of Real Estate Properties	'
	As of September 30, 2013 and December 31, 2012, we owned the following number of properties through unconsolidated joint venture entities.
		Ownership %		September 30,		December 31,
				2013		2012
	Duke JV	80.00%		20		37
	European JV	80.00%		6		6
	UK JV	80.00%		3		3
	Afton Ridge	90.00%		1		1
	CBRE Strategic Partners Asia	5.07%		3		7
				33		54
Investments in Unconsolidated Entities	'
	Investments in unconsolidated entities at September 30, 2013 and December 31, 2012 consist of the following (in thousands):
		September 30,			December 31,
		2013			2012
	Duke JV	$	267,572		$	344,511
	European JV	112,155			108,725
	UK JV	36,217			37,487
	Afton Ridge	39,400			17,008
	CBRE Strategic Partners Asia	9,425			8,098
		$	464,769		$	515,829
Summary of Investments in Unconsolidated Entities	'
	The following is a summary of the investments in unconsolidated entities for the nine months ended September 30, 2013 and the year ended December 31, 2012 (in thousands):
		September 30,			December 31,
		2013			2012
	Investment Balance, January 1	$	515,829		$	537,631
	Contributions	105,269			45,568
	Company's Equity in Net Income (including adjustments for basis differences)	10,263			3,959
	Other Comprehensive Income of Unconsolidated Entities	4,056			1,144
	Conversion of Duke JV Equity Investment to Controlling Interest	(139,770		)	—
	Distributions	(30,878		)	(72,473		)
	Investment Balance, End of Period	$	464,769		$	515,829
Consolidated Balance Sheet	'
	The combined balance sheets of our investments in unconsolidated entities at September 30, 2013 and December 31, 2012 are as follows (in thousands):
		September 30,			December 31,
		2013			2012
	Assets
	Investments in Real Estate (1)	$	929,665		$	1,240,196
	Other Assets	100,293			231,173
	Total Assets	$	1,029,958		$	1,471,369
	Liabilities and Equity
	Secured Notes Payable, net	$	239,730		$	620,457
	Other Liabilities	40,640			56,312
	Total Liabilities	280,370			676,769
	CSP Equity	464,769			515,829
	Other Investors' Equity	284,819			278,771
	Total Liabilities and Equity	$	1,029,958		$	1,471,369
	__________
	-1	Includes REIT Basis Adjustments for costs incurred by the Company outside of the Duke JV and Afton Ridge entities that are directly capitalizable to its investment in real estate assets acquired within the respective entities, including acquisition costs paid to our former investment advisor prior to January 1, 2009.
Consolidated Statement of Operations	'
	The combined statements of operations for our investments in unconsolidated entities for the three and nine months ended September 30, 2013 and 2012 are as follows (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013		2012
	Total Revenue	$	29,110		$	38,424		$	102,546	$	112,193
	Operating Expenses	7,259			12,616			26,627		41,783
	Net Operating Income	21,851			25,808			75,919		70,410
	Depreciation and Amortization	10,456			17,162			31,110		51,447
	Interest Expense	2,799			6,666			11,695		19,722
	Net Income (Loss) from Continuing Operations	8,596			1,980			33,114		(759		)
	Income from Discontinued Operations	12			—			2,248		—
	Net Income (Loss)	8,608			1,980			35,362		(759		)
	Company Share in Net Income	3,346			966			9,797		2,672
	Adjustments for REIT basis	(22		)	(39		)	466		(116		)
	CSP Equity in Net Income	$	3,324		$	927		$	10,263	$	2,556

Deferred_Leasing_Costs_and_Int1

Deferred Leasing Costs and Intangible Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Finite-Lived Intangible Assets	'
	The following table summarizes our deferred leasing costs and intangible assets (including acquired above-market leases and acquired in-place leases) and intangible liabilities (including acquired below market leases, and acquired above-market ground lease obligations).
		September 30,			December 31,
		2013			2012
		(in thousands)
	Deferred Leasing Costs and Intangible Assets, Net:
	Deferred Leasing Costs	$	6,789		$	6,350
	Accumulated Amortization	(2,405		)	(1,705		)
	Deferred Leasing Costs, Net	4,384			4,645
	Above-Market Leases	77,381			55,219
	Accumulated Amortization	(31,265		)	(23,364		)
	Above-Market Leases, Net	46,116			31,855
	In-Place Leases	325,903			252,501
	Accumulated Amortization	(116,670		)	(89,943		)
	In-Place Leases, Net	209,233			162,558
	Total Deferred Leasing Costs and Intangible Assets, Net	$	259,733		$	199,058
	Intangible Liabilities, Net:
	Below-Market Leases	$	49,820		$	43,659
	Accumulated Amortization	(21,950		)	(19,077		)
	Below-Market Leases, Net	27,870			24,582
	Above-Market Ground Lease Obligation	1,501			1,501
	Accumulated Amortization	(142		)	(89		)
	Above-Market Ground Lease Obligation, Net	1,359			1,412
	Total Intangible Liabilities, Net	$	29,229		$	25,994
Schedule of Acquired Finite-Lived Intangible Assets by Major Class	'
	The following table sets forth amortization related to intangible assets and liabilities for the three and nine months ended September 30, 2013 and 2012 (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Deferred Leasing Costs (1)	$	236		$	179		$	(700	)	$	499
	Above-Market Leases (2)	2,664			1,903			7,901			5,637
	In-Place Leases (1)	9,210			7,420			26,712			21,543
	Below-Market Leases (2)	(708		)	(2,093		)	(2,873		)	(4,326		)
	Above-Market Ground Lease Obligation (3)	(18		)	(18		)	(53		)	(53		)
	__________
	-1	The amortization of deferred leasing costs and in-place leases are recorded to depreciation and amortization expense in the condensed consolidated statements of operations for the periods presented.
	-2	The amortization of above-market leases and below-market leases are recorded as reductions and additions to rental income, respectively, in the condensed consolidated statements of operations for the periods presented.
	-3	The amortization of the above-market ground lease obligation is recorded as a decrease to property operating expense in the condensed consolidated statements of operations for the periods presented.
Schedule of Future Amortization of Acquisition Related Intangible Assets and Liabilities	'
	The following is a schedule of future amortization of deferred leasing costs, intangible assets and liabilities as of September 30, 2013 (in thousands):
		Intangible Assets									Intangible Liabilities
		Deferred Leasing Costs			Acquired			Acquired			Acquired			Above-Market
					Above-Market			In-Place Leases			Below-Market			Ground Lease
					Leases						Leases			Obligations
	Remaining 2013	$	239		$	2,486		$	9,738		$	1,042		$	18
	2014	905			9,507			37,020			4,156			71
	2015	703			9,093			34,682			3,986			71
	2016	599			5,551			27,870			3,398			71
	2017	541			4,406			23,395			2,898			71
	2018	499			3,898			20,472			2,579			71
	Thereafter	898			11,175			56,056			9,811			986
		$	4,384		$	46,116		$	209,233		$	27,870		$	1,359

Debt_Tables

Debt (Tables)	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Notes Payable Secured by Real Property	'
	Secured notes payable are summarized as follows (in thousands):
			Stated Interest Rate		Effective Interest Rate (1)		Maturity Date		September 30,			December 31,
	Property								2013			2012
	Albion Mills Retail Park - Swapped to Fixed (2) (3)		5.25%		5.25%		October 10, 2013		$	9,338		$	9,288
	Avion Midrise III & IV		5.52%		7.00%		April 1, 2014		20,103			20,464
	Maskew Retail Park - Swapped to Fixed(3)		5.68%		5.68%		August 10, 2014		22,621			22,698
	12650 Ingenuity Drive		5.62%		7.50%		October 1, 2014		11,952			12,272
	Bolingbrook Point III		5.26%		5.26%		January 1, 2015		7,900			7,900
	One Wayside Road		5.66%		5.25%		August 1, 2015		13,452			13,745
	One Wayside Road		5.92%		5.25%		August 1, 2015		11,244			11,464
	Lakeside Office Center		6.03%		6.03%		September 1, 2015		8,773			8,862
	Deerfield Commons I		5.23%		5.23%		December 1, 2015		9,329			9,442
	Celebration Office Center III(4)(5)		4.25%		2.50%		December 1, 2015		9,043			—
	22535 Colonial Pkwy(4)(5)		4.25%		2.50%		December 1, 2015		8,091			—
	Northpoint III(4)(5)		4.25%		2.50%		December 1, 2015		10,470			—
	Goodyear Crossing Ind. Park II(4)(5)		4.25%		2.50%		December 1, 2015		19,989			—
	3900 North Paramount Parkway(4)(5)		4.25%		2.50%		December 1, 2015		7,853			—
	3900 South Paramount Parkway(4)(5)		4.25%		2.50%		December 1, 2015		7,853			—
	1400 Perimeter Park Drive(4)(5)		4.25%		2.50%		December 1, 2015		2,380			—
	Miramar I(4)(5)		4.25%		2.50%		December 1, 2015		9,328			—
	Miramar II(4)(5)		4.25%		2.50%		December 1, 2015		12,565			—
	70 Hudson Street		5.65%		5.15%		April 11, 2016		116,585			117,981
	Point West I - Swapped to Fixed(4)		3.41%		3.41%		December 6, 2016		11,123			—
	100 Tice Blvd		5.97%		4.38%		September 15, 2017		19,684			20,094
	100 Tice Blvd		5.97%		4.38%		September 15, 2017		19,684			20,093
	4701 Gold Spike Drive(6)		4.45%		4.45%		March 1, 2018		10,202			10,342
	1985 International Way(6)		4.45%		4.45%		March 1, 2018		7,089			7,186
	Summit Distribution Center(6)		4.45%		4.45%		March 1, 2018		6,418			6,506
	3770 Deerpark Boulevard(6)		4.45%		4.45%		March 1, 2018		7,328			7,428
	Tolleson Commerce Park II(6)		4.45%		4.45%		March 1, 2018		4,406			4,467
	Atrium I - swapped to fixed(4)		3.78%		3.78%		May 31, 2018		22,750			—
	McAuley Place(4)		3.98%		3.50%		September 1, 2018		13,319			—
	Easton III - Swapped to Fixed(4)		3.95%		3.95%		January 31, 2019		6,513			—
	90 Hudson Street		5.66%		5.26%		May 1, 2019		105,321			106,465
	Fairforest Bldg. 6		5.42%		6.50%		June 1, 2019		2,166			2,402
	North Rhett I		5.65%		6.50%		August 1, 2019		2,513			2,827
			Stated Interest Rate		Effective Interest Rate (1)		Maturity Date		September 30,			December 31,
	Property								2013			2012
	Kings Mountain II		5.47%		6.50%		January 1, 2020		4,183			4,589
	North Rhett II		5.20%		6.50%		October 1, 2020		1,678			1,822
	Mount Holly Bldg.		5.20%		6.50%		October 1, 2020		1,678			1,822
	Orangeburg Park Bldg.		5.20%		6.50%		October 1, 2020		1,706			1,853
	Kings Mountain I		5.27%		6.50%		October 1, 2020		1,453			1,578
	Ten Parkway North		4.75%		4.75%		January 1, 2021		11,852			12,072
	Union Cross Bldg. II		5.53%		6.50%		June 1, 2021		6,644			7,149
	Union Cross Bldg. I		5.50%		6.50%		July 1, 2021		2,180			2,344
	Norman Pointe I(4)		5.24%		3.50%		October 1, 2021		20,593			—
	Norman Pointe II(4)		5.24%		3.50%		October 1, 2021		22,672			—
	The Landings I(4)		5.24%		3.50%		October 1, 2021		15,498			—
	The Landings II(4)		5.24%		3.50%		October 1, 2021		13,670			—
	Fairforest Bldg. 5		6.33%		6.50%		February 1, 2024		8,421			8,840
	North Rhett IV		5.80%		6.50%		February 1, 2025		8,547			8,935
	Thames Valley Five - Swapped to Fixed(7)		6.42%		6.42%		May 29, 2013		—			9,160
	Sabal Pavilion(8)		6.38%		3.00%		August 1, 2013		—			14,700
	Total Secured Notes Payable								678,160			496,790
	Plus Premium								18,088			7,555
	Less Discount								(1,569		)	(2,113		)
	Total Secured Notes Payable, Net								$	694,679		$	502,232
	__________
	-1	Represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of any discounts/premiums, excluding debt issuance costs.
	-2	This loan is presented at fair value. The fair value adjustment to its cost basis was $(3) and $(85) as of September 30, 2013 and December 31, 2012, respectively.  We paid off this loan in full subsequent to September 30, 2013. See Note 17 for additional information.
	-3	The loan is subject to certain financial covenants (interest coverage and loan to value).
	-4	The loans were assumed in connection with the acquisition of Duke Realty's 20% interest in the 17 properties held by the Duke JV on March 1, 2013 and were recorded at estimated fair value which included a $13.5 million total premium.
-5	These nine loans are cross-collateralized.
-6	These five loans are cross-collateralized.
-7	The loan was paid off in full on May 29, 2013.
-8	The loan was paid off in full on May 1, 2013.
The terms of our unsecured revolving credit facility are set forth in the table below.
	September 30,				December 31,
	2013				2012
	(in thousands)
Outstanding Borrowings	$	100,000			$	265,000
Remaining Borrowing Capacity	750,000				435,000
Total Borrowing Capacity	$	850,000			$	700,000
Interest Rate(1)	1.88		%		1.82		%
Unused Fee-Annual Rate(2)	30bps				30bps
Maturity Date(3)	Jan-18				Sep-16
__________
-1	Calculated based on one-month LIBOR plus 1.70% and 1.60% as of September 30, 2013 and December 31, 2012, respectively.
-2	The unused fee is paid on a quarterly basis and may be reduced to 25bps of the unused amount if our unsecured revolving credit facility utilization is greater than 50% of its capacity.
-3	Under the original and amended terms of our unsecured revolving credit facility, we may exercise an option to extend the maturity date by one year.
Schedule of Maturities of Long-term Debt	'
	The minimum principal payments due for our secured notes payable, unsecured term loan facilities and unsecured revolving credit facility are as follows as of September 30, 2013 (in thousands):
	Remaining 2013	$	13,278
	2014	70,225
	2015	148,476
	2016	134,179
	2017	46,355
	2018	372,070
	Thereafter	563,580
		$	1,348,163

Risk_Management_and_Use_of_Fin1

Risk Management and Use of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Schedule of Interest Rate Swap Derivative Instruments	'
	The following table sets forth the terms of our interest rate swaps at September 30, 2013 and December 31, 2012 (amounts in thousands):
		Notional Amount								Fair Value						Rate
	Type of Instrument	30-Sep-13				31-Dec-12				30-Sep-13			31-Dec-12			30-Sep-13		31-Dec-12		Index	Maturity Date
	Interest Rate Swap(1)	$	9,249			$	9,280			$	(9	)	$	(241	)	3.4	%	3.4	%	GBP LIBOR(2)	October 10, 2013
	Interest Rate Swap	22,621				22,698				(549		)	(1,015		)	2.9	%	2.9	%	GBP LIBOR(2)	August 10, 2014
	Interest Rate Swap(3)	11,123								(228		)				1.2	%			LIBOR	December 6, 2016
	Interest Rate Swap(4)	200,000								1,924						0.8	%			LIBOR	March 7, 2018
	Interest Rate Swap(3)	22,750								(505		)				1.6	%			LIBOR	May 31, 2018
	Interest Rate Swap	200,000								(987		)				1.4	%			LIBOR	January 15, 2019
	Interest Rate Swap(3)	6,513								(144		)				1.8	%			LIBOR	January 31, 2019
	Interest Rate Swap(4)	50,000								1,001						1.3	%			LIBOR	March 6, 2020
	Interest Rate Swap	120,000								(3,741		)				2.4	%			LIBOR	January 31, 2021
	Interest Rate Swap(5)	—				9,160				—			(182		)			4.9	%	GBP LIBOR(2)	May 30, 2013
	__________
	-1	We terminated the interest rate swap in October 2013. See Note 17 for additional information.
	-2	Based on the three month GBP-based LIBOR BBA Index with variable rate reset dates every 90 days during the term of the swaps.
	-3	We assumed this swap in connection with the purchase of the Duke Portfolio on March 1, 2013. This swap is considered a hedging instrument under ASC 815-20 as of September 30, 2013. The swap was not considered a hedging instrument under ASC 815-20 during the period from March 1, 2013 to March 31, 2013.
	-4	We entered into these swaps in connection with the origination of the TD Term Loan and WF Term Loan #1 in March 2013. These swaps are considered hedging instruments under ASC 815-20 as of September 30, 2013. These swaps were not considered hedging instruments under ASC 815-20 during the period from March 11, 2013 and March 12, 2013, respectively, to May 29, 2013.
	-5	We terminated this interest rate swap in May 2013.
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	'
	The asset and liability balances presented in the table below reflects the gross amounts of derivatives recorded in the condensed consolidated balance sheets.
		Asset Derivatives										Liability Derivatives
				Fair value									Fair value
	Type of Instrument	Balance Sheet Location		30-Sep-13				31-Dec-12				Balance Sheet Location	30-Sep-13			31-Dec-12
	Derivatives designated as hedging instruments
	Interest Rate Swaps	Prepaid Expenses and Other Assets		$	2,925			$	—			Accounts Payable, Accrued Expenses and Other Liabilities	$	6,154		$	1,015
	Derivatives not designated as hedging instruments
	Interest Rate Swaps	Prepaid Expenses and Other Assets		$	—			$	—			Accounts Payable, Accrued Expenses and Other Liabilities	$	9		$	423
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)	'
	The table below presents the effect of our derivative instruments on our condensed consolidated statement of operations for the three and nine months ended September 30, 2013 and 2012 (in thousands).
		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2013				2012				2013			2012
	Derivatives Designated as Cash Flow Hedges:
	Gain (Loss) Recognized in Other Comprehensive Income (OCI) (Effective Portion)	$	6,987			$	(1,142	)		$	3,598		$	(4,731	)
	Loss Reclassified from AOCI into Interest Expense (Effective Portion)	(858		)		(1,027		)		(1,693		)	(3,068		)
	Gain (Loss) Recognized in Gain from Interest Rate Swaps (Ineffective Portion and Amount Excluded from Effectiveness Testing)	(32		)		(494		)		(38		)	(506		)
	Amount of Gain on Derivatives Recognized in Earnings Under Gain from Interest Rate Swaps	221				134				1,381			380
	Loss Recognized in Loss on Conversion of Equity Interest to Controlling Interest	(1,414		)		—				(1,414		)	—
	Derivatives Not Designated as Cash Flow Hedges:
	Realized and Unrealized Gain Recognized in Gain from Interest Rate Swaps	$	76			$	(55	)		$	388		$	(145	)

Future_Minimum_Rents_Tables

Future Minimum Rents (Tables)	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Schedule of Minimum Future Rents to be Received on Non-cancelable Operating Leases	'
	The following is a schedule of future minimum rents to be received on non-cancelable operating leases from consolidated properties as of September 30, 2013 (in thousands):
	Remaining 2013	$	51,111
	2014	202,674
	2015	197,443
	2016	177,573
	2017	161,794
	2018	152,192
	Thereafter	502,173
		$	1,444,960

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2013
Related Party Transactions [Abstract]	'
Schedule of Related Party Transactions	'
	The various fees paid to the former investment advisor are summarized in the table below for the indicated periods (in thousands):
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Investment Management Fees	$	—	$	5,159	$	489	$	17,270
	Transition Services Agreement Fees	—		2,500		686		2,500
	Acquisition-Related Fees	—		944		1,472		2,061
	Property Management Fees (1)	288		396		808		1,168
	Leasing Commissions (1)	154		292		693		581
	Construction Supervision and Management Fees (1)	—		246		871		803
	Brokerage Fees(2)	—		203		—		203
	Other	—		—		—		26
	Total	$	442	$	9,740	$	5,019	$	24,612
	__________
	-1	Such fees for each service ranged from 2.0% to 5.0% of gross revenues received from a property that we owned.
	-2	The brokerage fee upon the sale of properties was an amount equal to the lesser of (i) one-half of the competitive real estate commission or (ii) 3% of the sales price of each property sold. The total brokerage commission paid did not exceed the lesser of the competitive real estate commission or an amount equal to 6% of the sales price of the property.

Equity_Incentive_Plan_and_Perf1

Equity Incentive Plan and Performance Bonus Plan (Tables)	9 Months Ended
	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Summary of Time-Based Restricted Common Shares	'
	A summary of our Time-Based Restricted Common Shares from January 1, 2013 through September 30, 2013 is presented below:
		Nonvested
		Shares		Weighted-Average			Vested
				Grant Date
				Fair Value
				per Share
	Outstanding at January 1, 2013	300,000		$	10		—
	Granted	398,925		10			—
	Vested	(100,000	)	10			100,000
	Canceled (1)	—		—			(33,515	)
	Outstanding as of September 30, 2013	598,925		$	10		66,485
	__________
	-1	33,515 common shares were tendered in accordance with the terms of the 2013 equity incentive plan to satisfy minimum state tax withholding requirements related to the restricted common shares that have vested. We accept the return of shares at the current quoted closing share price of the Company's common shares on the NYSE to satisfy tax obligations.
Summary of Performance-Based Restricted Common Shares	'
	A summary of Performance-Based Restricted Common Shares from January 1, 2013 through September 30, 2013 is presented below:
		Nonvested
		Shares		Weighted-Average			Vested
				Grant Date
				Fair Value
				per Share
	Outstanding January 1, 2013	375,000		$	10		—
	Granted	27,500		8.9			—
	Vested	(402,500	)	9.92			402,500
	Canceled (1)	—		—			(144,563	)
	Outstanding as of September 30, 2013	—		$	—		257,937
	-1	144,563 common shares were tendered in accordance with the terms of the 2013 equity incentive plan to satisfy minimum state tax withholding requirements related to the restricted common shares that have vested. We accept the return of shares at the current quoted closing share price of the Company's common shares on the NYSE to satisfy tax obligations.
Summary of Compensation Expense and Details	'
		2013			2012
	Compensation Expense Recorded During the Nine Months ended September 30(1)	$	5,354		$	215
	Unamortized Compensation Costs	$	4,998		$	6,398
	Units Available for the Future Awards(2)	4,597,500			19,298,000
	__________
	-1	Compensation Expense includes expenses incurred in our Listing Expense totaling $3.8 million.
	-2	Units available for the future awards includes units under the 2013 equity incentive plan, which was the successor to the amended and restated 2004 equity incentive plan.

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Components of Accumulated Other Comprehensive Income	'
	The following presents the changes in the balances of each component of accumulated other comprehensive income (loss) for the nine months ended September 30, 2013 and 2012 (in thousands):
		Foreign Currency			Swap Fair Value			Accumulated
		Translation Loss			Adjustment			Other
								Comprehensive Loss
	Balance at January 1, 2013	$	(6,164	)	$	(2,423	)	$	(8,587	)
	Other Comprehensive Income (Loss) Before Reclassifications	2,955			(2,188		)	767
	Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	—			1,693			1,693
	Balance at September 30, 2013	$	(3,209	)	$	(2,918	)	$	(6,127	)
		Foreign Currency			Swap Fair Value			Accumulated
		Translation Loss			Adjustment			Other
								Comprehensive Loss
	Balance at January 1, 2012	$	(10,579	)	$	(13,085	)	$	(23,664	)
	Other Comprehensive Income (Loss) Before Reclassifications	1,036			(2,438		)	(1,402		)
	Balance at September 30, 2012	$	(9,543	)	$	(15,523	)	$	(25,066	)

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments and Investments (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis	'
	The following items are measured at fair value on a recurring basis at September 30, 2013 and December 31, 2012 (in thousands):
		As of September 30, 2013
						Fair Value Measurements Using:
		Total				Quoted				Significant			Significant
		Fair Value				Markets				Observable			Unobservable
						Prices				Inputs			Inputs
						(Level 1)				(Level 2)			(Level 3)
	Financial Assets (Liabilities)
	Cash and Cash Equivalents	$	5,568			$	5,568			$	—		$	—
	Interest Rate Swap Not Designated as Cash Flow Hedge	(9		)		—				(9		)	—
	Interest Rate Swaps Designated as Cash Flow Hedges - Assets	2,925				—				2,925			—
	Interest Rate Swaps Designated as Cash Flow Hedges - Liabilities	(6,154		)		—				(6,154		)	—
	Investment in CBRE Strategic Partners Asia	9,425				—				—			9,425
	Secured Notes Payable - Albion Mills	(9,338		)		—				—			(9,338		)
	Class B Interest	(200		)		—				—			(200		)
		As of December 31, 2012
						Fair Value Measurements Using:
		Total				Quoted				Significant			Significant
		Fair Value				Markets				Observable			Unobservable
						Prices				Inputs			Inputs
						(Level 1)				(Level 2)			(Level 3)
	Financial Assets (Liabilities)
	Cash and Cash Equivalents	$	6,495			$	6,495			$	—		$	—
	Interest Rate Swaps Not Designated as Cash Flow Hedge	(423		)		—				(423		)	—
	Interest Rate Swaps Designated as Cash Flow Hedges	(1,015		)		—				(1,015		)	—
	Investment in CBRE Strategic Partners Asia	8,098				—				—			8,098
	Secured Notes Payable - Albion Mills	(9,288		)		—				—			(9,288		)
	Class B Interest	(200		)		—				—			(200		)
Investment in CBRE Strategic Partners Asia Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)	'
	The following table presents our activity for the variable rate note payable and our investment in CBRE Strategic Partners Asia measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the nine months ended September 30, 2013 and 2012, respectively (in thousands):
	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)		Investment in				Secured notes payable - Albion Mills
			CBRE Strategic
			Partners Asia
	Balance at January 1, 2013		$	8,098			$	(9,288	)
	Contributions		—				—
	Distributions		—				—
	Total Income (Loss) on Fair Value Adjustment		1,327				(78		)
	Translation Adjustment in Other Comprehensive Income		—				28
	Balance as of September 30, 2013		$	9,425			$	(9,338	)
	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)		Investment in				Secured notes payable - Albion Mills
			CBRE Strategic
			Partners Asia
	Balance at January 1, 2012		$	8,381			$	(8,775	)
	Contributions		2,029				—
	Distributions		(2,400		)		—
	Total Loss on Fair Value Adjustment		(231		)		(85		)
	Translation Adjustment in Other Comprehensive Income		—				(348		)
	Balance at September 30, 2012		$	7,779			$	(9,208	)
Summary of Notes Payable and Estimated Fair Value	'
	For disclosure purposes only, the following table summarizes our notes payable and their estimated fair value at September 30, 2013 and December 31, 2012 (in thousands):
			Book Value								Fair Value
	Financial Instrument		September 30,				December 31,				September 30,			December 31,
			2013				2012				2013			2012
	Secured Notes Payable(1)		$	685,341			$	492,944			$	732,794		$	514,451
	Secured Notes Payable - Albion Mills(1)		9,338				9,288				9,338			9,288
	Total Secured Notes Payable(1)		$	694,679			$	502,232			$	742,132		$	523,739
	Unsecured Term Loan Facilities(1)		$	570,000			$	—			$	570,000		$	—
	Unsecured Revolving Credit Facility(1)		$	100,000			$	265,000			$	100,000		$	265,000
	__________
	-1	Level 3: For purposes of this fair value disclosure, we based our fair value estimate for notes payable on our internal valuation that includes a representative sample of our lenders’ market interest rate quotes as of September 30, 2013 and December 31, 2012 for debt with similar risk characteristics and maturities. We based our notes payable secured by our Albion Mills property carried at fair value on a third party appraiser’s valuation, which used similar techniques as our internal valuation model as of September 30, 2013 and December 31, 2012.

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Minimum Commitment Under Ground Lease	'
	The minimum commitment under the ground lease as of September 30, 2013 and thereafter is as follows:
	Remaining 2013	$	61
	2014	273
	2015	273
	2016	273
	2017	273
	2018	276
	Thereafter	4,782
		$	6,211

Segment_Disclosure_Tables

Segment Disclosure (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Comparison of Net Operating Income	'
	The following table compares the net operating income for the three and nine months ended September 30, 2013 and 2012 (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Domestic Industrial Properties
	Revenues:
	Rental	$	13,729		$	11,880		$	40,792		$	31,645
	Tenant Reimbursements	3,475			2,077			12,331			6,995
	Total Revenues	17,204			13,957			53,123			38,640
	Property and Related Expenses:
	Property Operating	1,009			842			3,175			2,524
	Real Estate Taxes	3,452			2,086			11,092			6,127
	Total Property and Related Expenses	4,461			2,928			14,267			8,651
	Net Operating Income	$	12,743		$	11,029		$	38,856		$	29,989
	Domestic Office Properties
	Revenues:
	Rental	$	35,683		$	24,230		$	100,279		$	72,862
	Tenant Reimbursements	10,615			6,996			27,499			18,314
	Total Revenues	46,298			31,226			127,778			91,176
	Property and Related Expenses:
	Property Operating	7,345			4,062			19,075			13,214
	Real Estate Taxes	6,477			4,666			17,618			11,411
	Total Property and Related Expenses	13,822			8,728			36,693			24,625
	Net Operating Income	$	32,476		$	22,498		$	91,085		$	66,551
	International Office/Retail Properties
	Revenues:
	Rental	$	1,750		$	1,870		$	5,242		$	5,359
	Tenant Reimbursements	88			94			258			257
	Total Revenues	1,838			1,964			5,500			5,616
	Property and Related Expenses:
	Property Operating	271			244			422			744
	Real Estate Taxes	—			—			—			—
	Total Property and Related Expenses	271			244			422			744
	Net Operating Income	$	1,567		$	1,720		$	5,078		$	4,872
Reconciliation to Consolidated Net Income (Loss)	'
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Reconciliation to Consolidated Net Income (Loss)
	Total Segment Net Operating Income	$	46,786		$	35,247		$	135,019		$	101,412
	Expenses:
	General and Administrative	5,397			7,162			17,710			10,973
	Investment Management Fee	—			5,159			489			17,270
	Acquisition-related Expenses	175			1,099			2,179			2,508
	Depreciation and Amortization	26,635			18,787			75,409			54,749
	Transition and Listing Expenses	1,447			6,216			12,681			8,152
		13,132			(3,176		)	26,551			7,760
	Other Income and Expenses
	Interest and Other Income	551			229			1,028			1,714
	Interest Expense	(13,120		)	(8,737		)	(33,953		)	(26,528		)
	Gain on Interest Rate Swaps	265			134			1,731			380
	Loss on Early Extinguishment of Debt	(1,572		)	(1,686		)	(1,572		)	(1,686		)
	(Loss) Gain on Conversion of Equity Investment to Controlling Interest	(1,667		)	—			75,535			—
	(Loss) Income from Continuing Operations Before Provision for Income Taxes and Equity in Income of Unconsolidated Entities	(2,411		)	(13,236		)	69,321			(18,361		)
	Provision for Income Taxes	(54		)	(75		)	(274		)	(217		)
	Equity in Income of Unconsolidated Entities	3,324			927			10,263			2,556
	Net Income (Loss) from Continuing Operations	859			(12,384		)	79,310			(16,022		)
	Discontinued Operations
	Realized Loss from Sale	—			—			—			(415		)
	Loss From Discontinued Operations	—			—			—			(415		)
	Net Income (Loss)	$	859		$	(12,384	)	$	79,310		$	(16,437	)
Condensed Assets	'
		September 30,			December 31,
	Condensed Assets	2013			2012
	Domestic Industrial Properties	$	743,776		$	678,930
	Domestic Office Properties	1,616,881			1,077,328
	International Office/Retail Properties	103,396			105,502
	Non-Segment Assets (1)	527,104			616,276
	Non-Segment Construction in Progress and Other Assets—Variable Interest Entity	—			76,826
	Total Assets	$	2,991,157		$	2,554,862
	(1) Non-segment assets primarily include our investments in unconsolidated entities.

Earnings_Per_Share_Attributabl1

Earnings Per Share Attributable to Common Shareholders (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Schedule of Earnings Per Share, Basic and Diluted	'
	The following table reconciles the numerator and denominator in computing the Company's basic and diluted per-share computations for net income (loss) available to common shareholders for three and nine months ended September 30, 2013 and 2012 is as follows (in thousands except share data):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Numerator:
	Income (Loss) from Continuing Operations	$	859		$	(12,384	)	$	79,310		$	(16,022	)
	(Income) Loss from Continuing Operations Attributable to Noncontrolling Interests	(3		)	5			(83		)	7
	Allocation to Participating Securities (Nonvested Time-Based Shares)	(75		)	(45		)	(285		)	(45		)
	Numerator for Basic and Diluted Income (Loss) from Continuing Operations	781			(12,424		)	78,942			(16,060		)
	Loss from Discontinued Operations	—			—			—			(415		)
	Numerator for Basic and Diluted Income (Loss) Available to Common Shareholders	$	781		$	(12,424	)	$	78,942		$	(16,475	)
	Denominator:
	Basic Weighted Average Vested Shares Outstanding	236,548,477			249,173,577			244,373,249			247,718,798
	Effect of Dilutive Securities - Performance-Based Shares (1)	—			—			—			—
	Diluted Weighted Average Vested Shares Outstanding	236,548,477			249,173,577			244,373,249			247,718,798
	Basic and Diluted Earnings Per Share:
	Income (Loss) from Continuing Operations Available to Common Shareholders per Share	$	0		$	(0.05	)	$	0.32		$	(0.07	)
	Income (Loss) from Discontinued Operations Available to Common Shareholders per Share	$	0		$	0		$	0		$	0
	Net Income (Loss) Available to Common Shareholders per Share	$	0		$	(0.05	)	$	0.32		$	(0.07	)
	__________
	-1	375,000 performance-based shares granted in September 2012 and subsequently vested in May 2013 are not included in the diluted weighted average share calculations for the three and nine months ended September 30, 2012 because the effect would be anti-dilutive.

Organization_and_Nature_of_Bus1

Organization and Nature of Business - Additional Information (Details) (USD $)	9 Months Ended			0 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Aug. 19, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
	entities	Property		REIT Holdings	CSP OP	Consolidated Entities	Consolidated Entities	Unconsolidated Properties	Unconsolidated Properties	CBRE Strategic Partners Asia	CBRE Strategic Partners Asia
	Property					Property	Triple Net Lease, Single Tenant Properties	Property	Triple Net Lease, Single Tenant Properties	Property	Property
						sqft	Property	sqft	Property
							sqft		sqft
Schedule of Equity Method Investments [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Common Shares of Beneficial Interest, par value	$0.01	$0.01	$0.01	'	'	'	'	'	'	'	'
Limited partnership units redeemed	'	'	'	246,361	'	'	'	'	'	'	'
Percentage of ownership interest in limited partnership Units	0.10%	'	'	'	'	'	'	'	'	'	'
Interest owned	'	'	'	'	100.00%	'	'	'	'	5.07%	'
Repurchase and Cancellation of Common Shares	$125,000	'	'	'	'	'	'	'	'	'	'
Repurchase and Cancellation of Common Shares, Shares	12,376,235	'	'	'	'	'	'	'	'	'	'
Common shares purchase price, Per share	$10.10	'	'	'	'	'	'	'	'	'	'
Common Shares of Beneficial Interest, issued	236,463,981	249,664,156	'	'	'	'	'	'	'	'	'
Number of Real Estate Properties	33	54	'	'	'	101	'	30	'	3	7
Number Of States In Which Consolidated Properties Located	'	'	'	'	'	19	'	9	'	'	'
Net Rentable Area	'	'	'	'	'	22,800,000	18,100,000	11,748,000	10,200,000	'	'
Percentage of leased property	'	'	'	'	'	94.40%	'	99.10%	'	'	'
Property Subject to or Available for Operating Lease, Number of Units	'	'	'	'	'	'	74	'	18	'	'
Equity Method Investments, Unconsolidated Entities, Number	5	'	'	'	'	'	'	'	'	'	'

Basis_of_Presentation_and_Summ2

Basis of Presentation and Summary of Significant Accounting Policies (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

segments

Property

Selling, General and Administrative Expenses [Member]

Selling, General and Administrative Expenses [Member]

Accounts Payable and Accrued Liabilities

United Kingdom

United Kingdom

United Kingdom

United Kingdom

United Kingdom

European

European

European

European

European

geographic_areas

Schedule of Equity Method Investments [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Transition and Listing

$1,447,000

$6,216,000

'

$12,681,000

$8,152,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Geographic Regions

'

'

2

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of reportable segments

'

'

3

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Irrevocable stand-by letters of credit

15,200,000

'

15,200,000

15,200,000

'

17,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Allowance for uncollectible rent receivable

23,000

'

23,000

23,000

'

11,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Exchange rate

'

'

'

'

'

'

'

'

'

1.6186

'

1.6186

'

1.6242

1.3524

'

1.3524

'

1.3189

Profit and loss weighted average exchange rate

'

'

'

'

'

'

'

'

'

1.5301

1.5755

1.5449

1.579

'

1.3175

1.251

1.3146

1.2859

'

Transition costs

700,000

'

'

6,200,000

8,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Listing costs

'

'

'

11,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Listing expenses attributable to share-based compensation

'

'

'

3,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income Tax Expense (Benefit)

54,000

75,000

'

274,000

217,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent

'

'

'

'

'

'

'

'

'

'

'

20.00%

'

'

'

'

'

'

'

Deferred Tax Assets, Gross

'

'

'

'

'

'

'

'

'

800,000

'

800,000

'

'

'

'

'

'

'

Deferred Tax Assets, Valuation Allowance

'

'

'

'

'

'

'

'

'

800,000

'

800,000

'

'

'

'

'

'

'

Prior Period Reclassification Adjustment

'

'

'

'

'

'

($379,000)

($1,000,000)

$8,200,000

'

'

'

'

'

'

'

'

'

'

Investment_in_Real_Estate_Acti2

Investment in Real Estate Activity (Narrative) (Details) (USD $)

3 Months Ended

9 Months Ended

1 Months Ended

0 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Jul. 09, 2012

Jul. 31, 2013

Aug. 08, 2013

Mar. 01, 2013

Jan. 30, 2013

Jan. 30, 2013

Sep. 30, 2013

Mar. 01, 2013

Jan. 30, 2013

Mar. 01, 2013

Jan. 30, 2013

Jan. 30, 2013

Cherokee Corporate Pk

Wholly Owned Properties

Wholly Owned Properties

Partially Owned Properties

Partially Owned Properties

Partially Owned Properties

Partially Owned Properties

Partially Owned Properties

Partially Owned Properties

Partially Owned Properties

Office Building

Warehouse

Carpenter Center

1200 Woods Chapel

1400 Atwater

Duke Portfolio

Duke Portfolio

Duke Portfolio

CSP OP

Partially Owned Properties

Partially Owned Properties

sqft

sqft

Property

Duke Portfolio

Duke Portfolio

Property

Property

sqft

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Purchase and sale agreement, acquisitions

'

'

$114,457,000

$127,300,000

'

$49,500,000

$10,800,000

'

'

'

'

'

'

'

'

'

Area occupied in square foot

'

'

'

'

'

226,822

156,800

'

'

'

'

'

'

'

'

'

Percentage of leased property

'

'

'

'

'

100.00%

100.00%

'

'

'

'

'

'

'

'

'

Parent ownership interest, changes, purchase of interest by parent, percent

'

'

'

'

'

'

'

'

'

5.00%

'

'

'

'

'

'

Parent ownership interest, changes, purchase of interest by parent

'

'

'

'

'

'

'

'

3,400,000

'

'

'

'

'

'

'

Business acquisition, Percentage of interests acquired

'

'

'

'

'

'

'

'

'

'

'

'

20.00%

'

'

'

Number Of Properties Acquired

'

'

'

'

'

'

'

'

'

'

'

'

17

'

16

1

Area of Building

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,318,402

Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

80.00%

'

'

Business Combination, Step Acquisition, VIE, Equity Interest in Acquired, Percent

'

'

'

'

'

'

'

'

'

'

'

20.00%

'

'

'

'

Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

Business Combination, Consideration Transferred

'

'

'

'

'

'

'

98,100,000

'

'

'

'

'

'

'

'

Including equity interest in acquiree held prior to combination

'

'

'

'

'

'

'

490,700,000

'

'

'

'

'

'

'

'

Secured Notes Payable, Net (2)

'

'

'

'

'

'

'

'

'

'

229,539,000

[1]

'

'

'

'

'

Acquisition-Related

175,000

1,099,000

2,179,000

2,508,000

'

'

'

'

'

'

'

'

'

'

'

'

Disposal Group Discontinued Operation Loss Gain On Write Off

0

0

0

415,000

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Sale of Property, Plant, and Equipment

'

'

'

'

2,900,000

'

'

'

'

'

'

'

'

'

'

'

Conversion of Duke JV Equity Investment to Controlling Interest

($1,667,000)

$0

$75,535,000

$0

'

'

'

'

'

'

'

'

'

'

'

'

[1]

cured notes payable is presented net of a premium of $13.5 million.

Investment_in_Real_Estate_Acti3

Investment in Real Estate Activity (Allocation of Assets and Liabilities of Acquired Assets) (Details) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

In Thousands, unless otherwise specified

Wholly Owned Properties

Wholly Owned Properties

Wholly Owned Properties

Wholly Owned Properties

Wholly Owned Properties

Wholly Owned Properties

Wholly Owned Properties

Wholly Owned Properties

Wholly Owned Properties

Partially Owned Properties

Partially Owned Properties

Partially Owned Properties

Partially Owned Properties

Partially Owned Properties

Partially Owned Properties

Carpenter Center

1200 Woods Chapel

Below-market leases

Below-market leases

Below-market leases

Above-market leases

Above-market leases

Above-market leases

Duke Portfolio

Below-market leases

Below-market leases

Above-market leases

Above-market leases

Carpenter Center

1200 Woods Chapel

Carpenter Center

1200 Woods Chapel

Duke Portfolio

Duke Portfolio

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Land

'

'

$7,461

$5,901

$1,560

'

'

'

'

'

'

'

$60,473

'

'

'

'

Building and Improvements

'

'

43,307

35,950

7,357

'

'

'

'

'

'

'

363,778

'

'

'

'

Finite-lived Intangible Assets Acquired

'

'

'

'

'

9,032

[1]

7,795

[1]

1,237

[1]

1,077

[1]

481

[1]

596

[1]

'

'

'

64,421

[2]

'

21,084

[2]

Total Acquired Assets

'

'

60,877

50,127

10,750

'

'

'

'

'

'

'

509,756

'

'

'

'

Secured Notes Payable, Net (2)

'

'

'

'

'

'

'

'

'

'

'

'

229,539

[3]

'

'

'

'

Acquired Below-Market Leases (3)

'

'

618

[4]

618

[4]

0

[4]

'

'

'

'

'

'

'

5,549

[5]

'

'

'

'

Total Assumed Liabilities

'

'

618

618

0

'

'

'

'

'

'

'

235,088

'

'

'

'

Net Assets Acquired

'

'

60,259

49,509

10,750

'

'

'

'

'

'

'

274,668

'

'

'

'

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

'

'

'

'

'

'9 years 4 months 2 days

'

'

'7 years 6 months 22 days

'

'

'

'

'6 years 10 months 2 days

'

'7 years 9 months 22 days

'

Notes Payable, premium

$18,088

$7,555

'

'

'

'

'

'

'

'

'

$13,500

'

'

'

'

'

Below Market Leases, Acquired, Weighted Average Amortization Period

'

'

'9 years 11 months 1 day

'

'

'

'

'

'

'

'

'7 years 9 months 29 days

'

'

'

'

'

[1]

Represents in-place leases with a weighted average amortization period of 9.34 years and above-market leases with a weighted average amortization period of 7.56 years.

[2]

Represents in-place leases with a weighted average amortization period of 6.84 years and above-market leases with a weighted average amortization period of 7.81 years.

[3]

cured notes payable is presented net of a premium of $13.5 million.

[4]

Represents below-market leases with a weighted average amortization period of 9.92 years.

[5]

Represents below-market leases with a weighted average amortization period of 7.83 years.

Investment_in_Real_Estate_Acti4

Investment in Real Estate Activity (Pro Forma Operations) (Details) (USD $)	2 Months Ended	3 Months Ended		9 Months Ended		7 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013
	Carpenter and Woods Chapel	Carpenter and Woods Chapel	Carpenter and Woods Chapel	Carpenter and Woods Chapel	Carpenter and Woods Chapel	Duke Joint Venture
Business Acquisition [Line Items]	'	'	'	'	'	'
Revenues	$876	$65,971	$67,557	$200,742	$200,432	$35,781
Net Operating Income	'	13,687	2,595	32,366	23,945	'
Net Income	$254	$1,411	($9,234)	$84,056	($7,773)	$499
Basic and Diluted Income per Share	'	$0.01	($0.04)	$0.34	($0.03)	'

Investments_in_Unconsolidated_2

Investments in Unconsolidated Entities - Properties (Details)	Sep. 30, 2013	Dec. 31, 2012
	Property	Property
Schedule of Equity Method Investments [Line Items]	'	'
Number of Real Estate Properties	33	54
Duke Joint Venture	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Interest owned	80.00%	'
Number of Real Estate Properties	20	37
European JV	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Interest owned	80.00%	'
Number of Real Estate Properties	6	6
UK JV	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Interest owned	80.00%	'
Number of Real Estate Properties	3	3
Afton Ridge Joint Venture	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Interest owned	90.00%	'
Number of Real Estate Properties	1	1
CBRE Strategic Partners Asia	'	'
Schedule of Equity Method Investments [Line Items]	'	'
Interest owned	5.07%	'
Number of Real Estate Properties	3	7

Investments_in_Unconsolidated_3

Investments in Unconsolidated Entities - Investments (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Schedule of Equity Method Investments [Line Items]	'	'	'
Investments in unconsolidated entities	$464,769	$515,829	$537,631
Duke Joint Venture	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'
Investments in unconsolidated entities	267,572	344,511	'
European JV	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'
Investments in unconsolidated entities	112,155	108,725	'
UK JV	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'
Investments in unconsolidated entities	36,217	37,487	'
Afton Ridge Joint Venture	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'
Investments in unconsolidated entities	39,400	17,008	'
CBRE Strategic Partners Asia	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'
Investments in unconsolidated entities	$9,425	$8,098	'

Investments_in_Unconsolidated_4

Investments in Unconsolidated Entities - Investments Roll Forward (Details) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]	'	'
Investment Balance, January 1	$515,829	$537,631
Contributions	105,269	45,568
Company's Equity in Net Income (including adjustments for basis differences)	10,263	3,959
Other Comprehensive (Loss) Income of Unconsolidated Entities	-4,056	-1,144
Conversion of Duke JV Equity Investment to Controlling Interest	-139,770	0
Distributions	30,878	72,473
Investment Balance, End of Period	$464,769	$515,829

Investments_in_Unconsolidated_5

Investments in Unconsolidated Entities - Consolidated Balance Sheet (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Assets	'		'
Assets	$1,029,958		$1,471,369
Liabilities and Equity	'		'
Liabilities	280,370		676,769
Company's Equity	464,769		515,829
Other Investor's Equity	284,819		278,771
Total Liabilities and Equity	1,029,958		1,471,369
Investments in Real Estate	'		'
Assets	'		'
Assets	929,665	[1]	1,240,196	[1]
Other Assets	'		'
Assets	'		'
Assets	100,293		231,173
Secured Debt, net	'		'
Liabilities and Equity	'		'
Liabilities	239,730		620,457
Other Liabilities	'		'
Liabilities and Equity	'		'
Liabilities	$40,640		$56,312
[1]	Includes REIT Basis Adjustments for costs incurred by the Company outside of the Duke JV and Afton Ridge entities that are directly capitalizable to its investment in real estate assets acquired within the respective entities, including acquisition costs paid to our former investment advisor prior to January 1, 2009.

Investments_in_Unconsolidated_6

Investments in Unconsolidated Entities - Consolidated Statements of Operations (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Equity Method Investments and Joint Ventures [Abstract]	'	'	'	'
Total Revenues	$29,110	$38,424	$102,546	$112,193
Total Expenses	7,259	12,616	26,627	41,783
Net Operating Income	21,851	25,808	75,919	70,410
Total Revenues and Appreciation (Depreciation)	10,456	17,162	31,110	51,447
Interest Expense	2,799	6,666	11,695	19,722
Net Loss from Continuing Operations	8,596	1,980	33,114	-759
Net (Loss) Income from Discontinued Operations	12	0	2,248	0
Net (Loss) Income	8,608	1,980	35,362	-759
Company Share in Net Income/Loss	3,324	927	10,263	2,556
Adjustments for REIT basis	-22	-39	466	-116
CSP Equity in Net Income/Loss	$3,346	$966	$9,797	$2,672

Investments_in_Unconsolidated_7

Investments in Unconsolidated Entities - Narrative (Details) (USD $)	3 Months Ended		1 Months Ended	3 Months Ended		1 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 01, 2013	Jul. 02, 2013	Mar. 31, 2013	Sep. 30, 2013	Jul. 02, 2013	Sep. 30, 2013
	CBRE Strategic Partners Asia	Duke Portfolio	Duke Joint Venture	Duke Joint Venture	Duke Joint Venture	Afton Ridge Joint Venture	Afton Ridge Joint Venture
	Japan		Property	Property
	Property		Mortgages
Open Option Contracts Written [Line Items]	'	'	'	'	'	'	'
Number of properties sold	5	'	'	'	'	'	'
Interest owned	'	20.00%	'	'	80.00%	'	90.00%
Number of properties acquired	'	'	'	17	'	'	'
Mortgage notes contributions	'	'	$79.80	'	'	'	'
Percentage of Mortgage notes share	'	'	80.00%	'	'	'	'
Number of fixed rate mortgage notes	'	'	5	'	'	'	'
Number of properties	'	'	5	'	'	'	'
Mortgage notes remaining principal balance	'	'	99.2	'	'	'	'
Mortgage loan contributions	'	'	'	'	'	25.5	'
Reimburse portion of loan	'	'	'	'	'	$2.60	'

Deferred_Leasing_Costs_and_Int2

Deferred Leasing Costs and Intangible Assets and Liabilities (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Intangible Assets, net:	'	'
Total	$259,733	$199,058
Intangible Liabilities, net:	'	'
Below Market Lease, Gross	49,820	43,659
Below Market Lease, Accumulated Amortization	-21,950	-19,077
Acquired Intangible Liabilities, Net	27,870	24,582
Prepaid Rent and Security Deposits	1,501	1,501
Above Market Ground Leases Obligation Accumulated Amortization	-142	-89
Above Market Ground Lease Obligation, Net	1,359	1,412
Intangible Liabilities, Net	29,229	25,994
Lease commissions	'	'
Intangible Assets, net:	'	'
Finite-Lived Intangible Assets, Gross	6,789	6,350
Finite-Lived Intangible Assets, Accumulated Amortization	-2,405	-1,705
Total	4,384	4,645
Above-market leases	'	'
Intangible Assets, net:	'	'
Finite-Lived Intangible Assets, Gross	77,381	55,219
Finite-Lived Intangible Assets, Accumulated Amortization	-31,265	-23,364
Total	46,116	31,855
Below-market leases	'	'
Intangible Assets, net:	'	'
Finite-Lived Intangible Assets, Gross	325,903	252,501
Finite-Lived Intangible Assets, Accumulated Amortization	-116,670	-89,943
Total	$209,233	$162,558

Deferred_Leasing_Costs_and_Int3

Deferred Leasing Costs and Intangible Assets and Liabilities - Additional Information (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Lease commissions	'		'		'		'
Intangible Assets Goodwill And Other Assets [Line Items]	'		'		'		'
Amortization leases	$236	[1]	$179	[1]	($700)	[1]	$499	[1]
Above-market leases	'		'		'		'
Intangible Assets Goodwill And Other Assets [Line Items]	'		'		'		'
Amortization leases	2,664	[2]	1,903	[2]	7,901	[2]	5,637	[2]
Below-market leases	'		'		'		'
Intangible Assets Goodwill And Other Assets [Line Items]	'		'		'		'
Amortization leases	9,210	[1]	7,420	[1]	26,712	[1]	21,543	[1]
Below-Market Lease Value	'		'		'		'
Intangible Assets Goodwill And Other Assets [Line Items]	'		'		'		'
Amortization leases	-708	[2]	-2,093	[2]	-2,873	[2]	-4,326	[2]
Above Market Ground Lease Obligations	'		'		'		'
Intangible Assets Goodwill And Other Assets [Line Items]	'		'		'		'
Amortization leases	($18)	[3]	($18)	[3]	($53)	[3]	($53)	[3]
[1]	The amortization of deferred leasing costs and in-place leases are recorded to depreciation and amortization expense in the condensed consolidated statements of operations for the periods presented.
[2]	The amortization of above-market leases and below-market leases are recorded as reductions and additions to rental income, respectively, in the condensed consolidated statements of operations for the periods presented.
[3]	The amortization of the above-market ground lease obligation is recorded as a decrease to property operating expense in the condensed consolidated statements of operations for the periods presented.

Deferred_Leasing_Costs_and_Int4

Deferred Leasing Costs and Intangible Assets and Liabilities - Schedule of Future Amortization of Acquisition Related Intangible Assets and Liabilities (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Acquired Indefinite-lived Intangible Assets [Line Items]	'	'
Total	$259,733	$199,058
Lease commissions	'	'
Acquired Indefinite-lived Intangible Assets [Line Items]	'	'
2013 (Six months ending December 31, 2013)	239	'
2014	905	'
2015	703	'
2016	599	'
2017	541	'
2018	499	'
Thereafter	898	'
Total	4,384	4,645
Acquired Above-Market Leases	'	'
Acquired Indefinite-lived Intangible Assets [Line Items]	'	'
2013 (Six months ending December 31, 2013)	2,486	'
2014	9,507	'
2015	9,093	'
2016	5,551	'
2017	4,406	'
2018	3,898	'
Thereafter	11,175	'
Total	46,116	'
Below-market leases	'	'
Acquired Indefinite-lived Intangible Assets [Line Items]	'	'
2013 (Six months ending December 31, 2013)	9,738	'
2014	37,020	'
2015	34,682	'
2016	27,870	'
2017	23,395	'
2018	20,472	'
Thereafter	56,056	'
Total	209,233	162,558
Acquired Below-Market Leases	'	'
Acquired Indefinite-lived Intangible Assets [Line Items]	'	'
2013 (Six months ending December 31, 2013)	1,042	'
2014	4,156	'
2015	3,986	'
2016	3,398	'
2017	2,898	'
2018	2,579	'
Thereafter	9,811	'
Total	27,870	'
Above Market Ground Lease Obligations	'	'
Acquired Indefinite-lived Intangible Assets [Line Items]	'	'
2013 (Six months ending December 31, 2013)	18	'
2014	71	'
2015	71	'
2016	71	'
2017	71	'
2018	71	'
Thereafter	986	'
Total	$1,359	'

Debt_Notes_Payable_Secured_by_

Debt - Notes Payable Secured by Real Property (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Debt Instrument [Line Items]	'		'
Notes Payable	$694,679		$502,232
Consolidated Notes Payable	678,160		496,790
Plus Premium	18,088		7,555
Less Discount	-1,569		-2,113
Consolidated Notes Payable Net of Premium / Discount	694,679		502,232
Albion Mills Retail Park	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.25%	[1],[2]	'
Effective Interest Rate	5.25%	[1],[2],[3]	'
Maturity Date	10-Oct-13	[1],[2]	'
Notes Payable	'		9,288	[1],[2]
Avion Midrise III & IV	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.52%		'
Effective Interest Rate	7.00%	[3]	'
Maturity Date	1-Apr-14		'
Notes Payable	20,103		20,464
Maskew Retail Park	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.68%	[2]	'
Effective Interest Rate	5.68%	[2],[3]	'
Maturity Date	10-Aug-14	[2]	'
Notes Payable	22,621	[2]	22,698	[2]
12650 Ingenuity Drive	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.62%		'
Effective Interest Rate	7.50%	[3]	'
Maturity Date	1-Oct-14		'
Notes Payable	11,952		12,272
Bolingbrook Point III	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.26%		'
Effective Interest Rate	5.26%	[3]	'
Maturity Date	1-Jan-15		'
Notes Payable	7,900		7,900
One Wayside Road 1	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.66%		'
Effective Interest Rate	5.25%	[3]	'
Maturity Date	1-Aug-15		'
Notes Payable	13,452		13,745
One Wayside Road 2	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.92%		'
Effective Interest Rate	5.25%	[3]	'
Maturity Date	1-Aug-15		'
Notes Payable	11,244		11,464
Lakeside Office Center	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	6.03%		'
Effective Interest Rate	6.03%	[3]	'
Maturity Date	1-Sep-15		'
Notes Payable	8,773		8,862
Deerfield Commons I	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.23%		'
Effective Interest Rate	5.23%	[3]	'
Maturity Date	1-Dec-15		'
Notes Payable	9,329		9,442
Celebration Office Center	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	4.25%	[4],[5]	'
Effective Interest Rate	2.50%	[3],[4],[5]	'
Maturity Date	1-Dec-15	[4],[5]	'
Notes Payable	9,043	[4],[5]	0	[4],[5]
22535 Colonial Pkwy	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	4.25%	[4],[5]	'
Effective Interest Rate	2.50%	[3],[4],[5]	'
Maturity Date	1-Dec-15	[4],[5]	'
Notes Payable	8,091	[4],[5]	0	[4],[5]
Northpoint III	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	4.25%	[4],[5]	'
Effective Interest Rate	2.50%	[3],[4],[5]	'
Maturity Date	1-Dec-15	[4],[5]	'
Notes Payable	10,470	[4],[5]	0	[4],[5]
Goodyear Crossing Ind. Park II	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	4.25%	[4],[5]	'
Effective Interest Rate	2.50%	[3],[4],[5]	'
Maturity Date	1-Dec-15	[4],[5]	'
Notes Payable	19,989	[4],[5]	0	[4],[5]
3900 North Paramount Parkway	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	4.25%	[4],[5]	'
Effective Interest Rate	2.50%	[3],[4],[5]	'
Maturity Date	1-Dec-15	[4],[5]	'
Notes Payable	7,853	[4],[5]	0	[4],[5]
3900 South Paramount Parkway	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	4.25%	[4],[5]	'
Effective Interest Rate	2.50%	[3],[4],[5]	'
Maturity Date	1-Dec-15	[4],[5]	'
Notes Payable	7,853	[4],[5]	0	[4],[5]
1400 Perimeter Park Drive	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	4.25%	[4],[5]	'
Effective Interest Rate	2.50%	[3],[4],[5]	'
Maturity Date	1-Dec-15	[4],[5]	'
Notes Payable	2,380	[4],[5]	0	[4],[5]
Miramar I	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	4.25%	[4],[5]	'
Effective Interest Rate	2.50%	[3],[4],[5]	'
Maturity Date	1-Dec-15	[4],[5]	'
Notes Payable	9,328	[4],[5]	0	[4],[5]
Miramar II	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	4.25%	[4],[5]	'
Effective Interest Rate	2.50%	[3],[4],[5]	'
Maturity Date	1-Dec-15	[4],[5]	'
Notes Payable	12,565	[4],[5]	0	[4],[5]
70 Hudson Street	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.65%		'
Effective Interest Rate	5.15%	[3]	'
Maturity Date	11-Apr-16		'
Notes Payable	116,585		117,981
Point West I	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	3.41%	[4]	'
Effective Interest Rate	3.41%	[3],[4]	'
Maturity Date	6-Dec-16	[4]	'
Notes Payable	11,123	[4]	0	[4]
100 Tice Blvd 1	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.97%		'
Effective Interest Rate	4.38%	[3]	'
Maturity Date	15-Sep-17		'
Notes Payable	19,684		20,094
100 Tice Blvd 2	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.97%		'
Effective Interest Rate	4.38%	[3]	'
Maturity Date	15-Sep-17		'
Notes Payable	19,684		20,093
4701 Gold Spike Drive	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	4.45%	[6]	'
Effective Interest Rate	4.45%	[3],[6]	'
Maturity Date	1-Mar-18	[6]	'
Notes Payable	10,202	[6]	10,342	[6]
1985 International Way	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	4.45%	[6]	'
Effective Interest Rate	4.45%	[3],[6]	'
Maturity Date	1-Mar-18	[6]	'
Notes Payable	7,089	[6]	7,186	[6]
Summit Distribution Center	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	4.45%	[6]	'
Effective Interest Rate	4.45%	[3],[6]	'
Maturity Date	1-Mar-18	[6]	'
Notes Payable	6,418	[6]	6,506	[6]
3770 Deerpark Boulevard	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	4.45%	[6]	'
Effective Interest Rate	4.45%	[3],[6]	'
Maturity Date	1-Mar-18	[6]	'
Notes Payable	7,328	[6]	7,428	[6]
Tolleson Commerce Park II	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	4.45%	[6]	'
Effective Interest Rate	4.45%	[3],[6]	'
Maturity Date	1-Mar-18	[6]	'
Notes Payable	4,406	[6]	4,467	[6]
Atrium I	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	3.78%	[4]	'
Effective Interest Rate	3.78%	[3],[4]	'
Maturity Date	31-May-18	[4]	'
Notes Payable	22,750	[4]	0	[4]
McAuley Place	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	3.98%	[4]	'
Effective Interest Rate	3.50%	[3],[4]	'
Maturity Date	1-Sep-18	[4]	'
Notes Payable	13,319	[4]	0	[4]
Easton III	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	3.95%	[4]	'
Effective Interest Rate	3.95%	[3],[4]	'
Maturity Date	31-Jan-19	[4]	'
Notes Payable	6,513	[4]	0	[4]
90 Hudson Street	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.66%		'
Effective Interest Rate	5.26%	[3]	'
Maturity Date	1-May-19		'
Notes Payable	105,321		106,465
Fairforest Bldg. 6	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.42%		'
Effective Interest Rate	6.50%	[3]	'
Maturity Date	1-Jun-19		'
Notes Payable	2,166		2,402
North Rhett I	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.65%		'
Effective Interest Rate	6.50%	[3]	'
Maturity Date	1-Aug-19		'
Notes Payable	2,513		2,827
Kings Mountain II	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.47%		'
Effective Interest Rate	6.50%	[3]	'
Maturity Date	1-Jan-20		'
Notes Payable	4,183		4,589
North Rhett II	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.20%		'
Effective Interest Rate	6.50%	[3]	'
Maturity Date	1-Oct-20		'
Notes Payable	1,678		1,822
Mt Holly Bldg.	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.20%		'
Effective Interest Rate	6.50%	[3]	'
Maturity Date	1-Oct-20		'
Notes Payable	1,678		1,822
Orangeburg Park Bldg.	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.20%		'
Effective Interest Rate	6.50%	[3]	'
Maturity Date	1-Oct-20		'
Notes Payable	1,706		1,853
Kings Mountain I	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.27%		'
Effective Interest Rate	6.50%	[3]	'
Maturity Date	1-Oct-20		'
Notes Payable	1,453		1,578
Ten Parkway North	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	4.75%		'
Effective Interest Rate	4.75%	[3]	'
Maturity Date	1-Jan-21		'
Notes Payable	11,852		12,072
Union Cross Bldg. II	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.53%		'
Effective Interest Rate	6.50%	[3]	'
Maturity Date	1-Jun-21		'
Notes Payable	6,644		7,149
Union Cross Bldg. I	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.50%		'
Effective Interest Rate	6.50%	[3]	'
Maturity Date	1-Jul-21		'
Notes Payable	2,180		2,344
Norman Pointe I	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.24%	[4]	'
Effective Interest Rate	3.50%	[3],[4]	'
Maturity Date	1-Oct-21	[4]	'
Notes Payable	20,593	[4]	0	[4]
Norman Pointe II	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.24%	[4]	'
Effective Interest Rate	3.50%	[3],[4]	'
Maturity Date	1-Oct-21	[4]	'
Notes Payable	22,672	[4]	0	[4]
The Landings I	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.24%	[4]	'
Effective Interest Rate	3.50%	[3],[4]	'
Maturity Date	1-Oct-21	[4]	'
Notes Payable	15,498	[4]	0	[4]
The Landings II	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.24%	[4]	'
Effective Interest Rate	3.50%	[3],[4]	'
Maturity Date	1-Oct-21	[4]	'
Notes Payable	13,670	[4]	0	[4]
Fairforest Bldg. 5	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	6.33%		'
Effective Interest Rate	6.50%	[3]	'
Maturity Date	1-Feb-24		'
Notes Payable	8,421		8,840
North Rhett IV	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	5.80%		'
Effective Interest Rate	6.50%	[3]	'
Maturity Date	1-Feb-25		'
Notes Payable	8,547		8,935
Thames Valley Five	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	6.42%	[7]	'
Effective Interest Rate	6.42%	[3],[7]	'
Maturity Date	29-May-13	[7]	'
Notes Payable	0	[7]	9,160	[7]
Sabal Pavilion	'		'
Debt Instrument [Line Items]	'		'
Stated Interest Rate	6.38%	[8]	'
Effective Interest Rate	3.00%	[3],[8]	'
Maturity Date	1-Aug-13	[8]	'
Notes Payable	$0	[8]	$14,700	[8]
[1]	This loan is presented at fair value. The fair value adjustment to its cost basis was $(3) and $(85) as of September 30, 2013 and December 31, 2012, respectively. We paid off this loan in full subsequent to September 30, 2013. See Note 17 for additional information.
[2]	The loan is subject to certain financial covenants (interest coverage and loan to value).
[3]	Represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of any discounts/premiums, excluding debt issuance costs.
[4]	The loans were assumed in connection with the acquisition of Duke Realty's 20% interest in the 17 properties held by the Duke JV on March 1, 2013 and were recorded at estimated fair value which included a $13.5 million total premium.
[5]	These nine loans are cross-collateralized.
[6]	These five loans are cross-collateralized.
[7]	The loan was paid off in full on May 29, 2013.
[8]	The loan was paid off in full on May 1, 2013.

Debt_Notes_Payable_Secured_by_1

Debt - Notes Payable Secured by Real Property (Footnotes) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Feb. 08, 2011	Mar. 01, 2013	Mar. 01, 2013
In Thousands, unless otherwise specified	SecurityLoan		SecurityLoan	Duke Joint Venture	Duke Portfolio
				Property	Duke Joint Venture
Debt Instrument [Line Items]	'	'	'	'	'
Notes Payable Fair Value Adjustment Amount	($3)	($85)	'	'	'
Business acquisition, Percentage of interests acquired	'	'	'	'	20.00%
Number of properties acquired	'	'	'	17	'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	'	'	'	'	$13,500
Number of loan cross-collateralized by properties	9	'	5	'	'

Debt_Notes_Payable_Unsecured_T

Debt - Notes Payable - Unsecured Term Loan Facilities (Details) (USD $)

1 Months Ended

1 Months Ended

Mar. 06, 2013

Mar. 07, 2013

Mar. 07, 2013

Mar. 06, 2013

Mar. 07, 2013

Mar. 07, 2013

Mar. 07, 2013

Mar. 07, 2013

Sep. 12, 2013

Sep. 12, 2013

Sep. 12, 2013

Sep. 12, 2013

Sep. 26, 2013

Sep. 26, 2013

Sep. 26, 2013

Sep. 26, 2013

Sep. 26, 2013

Sep. 26, 2013

TD Bank

TD Term Loan

TD Term Loan

TD Term Loan

WF Term Loan 1

WF Term Loan 1

WF Term Loan 1

WF Term Loan 1

Capital One Term Loan

Capital One Term Loan

Capital One Term Loan

Capital One Term Loan

WF Term Loan 2 & WF Term Loan 3

WF Term Loan 2 & WF Term Loan 3

WF Term Loan 2

WF Term Loan 2

WF Term Loan 3

WF Term Loan 3

Minimum

Maximum

Maximum

Wells Fargo Bank

Weighted Average

Minimum

Maximum

Capital One

Weighted Average

Minimum

Maximum

Minimum

Maximum

Wells Fargo Bank

Weighted Average

Wells Fargo Bank

Weighted Average

TD Bank

TD Bank

TD Bank

Wells Fargo Bank

Wells Fargo Bank

Wells Fargo Bank

Capital One

Capital One

Capital One

Wells Fargo Bank

Wells Fargo Bank

Wells Fargo Bank

Wells Fargo Bank

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unsecured term loan

$50,000,000

'

'

'

$200,000,000

'

'

'

$120,000,000

'

'

'

'

'

$200,000,000

'

$200,000,000

'

Interest rate swap

3.43%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Term of instrument

'7 years

'

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest Rate

'

'

'

'

'

2.49%

'

'

'

4.42%

'

'

'

'

'

2.64%

'

3.27%

Leverage ratio contingent margin on interest rate

'

'

'

0.75%

'

'

'

0.60%

'

'

-0.20%

0.35%

-0.20%

0.35%

'

'

'

'

Credit rating contingent margin on interest rate

'

-0.60%

0.20%

'

'

'

-0.40%

0.50%

'

'

-0.55%

0.25%

-0.70%

0.30%

'

'

'

'

Debt_Notes_Payable_Unsecured_C

Debt - Notes Payable - Unsecured Credit Facility (Details) (USD $)	9 Months Ended		12 Months Ended		9 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2013	Sep. 26, 2013	Sep. 26, 2013	Sep. 30, 2013	Sep. 26, 2013	Sep. 13, 2013
					Minimum	Minimum	Maximum	Revolving credit facility	Revolving credit facility	Revolving credit facility
						Unspecified Group of Lenders	Unspecified Group of Lenders	Unspecified Group of Lenders	Unspecified Group of Lenders	Unspecified Group of Lenders
Line of Credit Facility [Line Items]	'		'		'	'	'	'	'	'
Outstanding borrowings	$100,000		$265,000		'	'	'	'	'	'
Remaining borrowing capacity	750,000		435,000		'	'	'	'	'	'
Total borrowing capacity	$850,000		$700,000		'	'	'	'	$850,000	$700,000
Margin on variable rate based on leverage ratio	'		'		'	1.50%	2.05%	'	'	'
Margin on variable rate based on credit rating	'		'		'	0.90%	1.70%	'	'	'
Interest rate	1.88%	[1]	1.82%	[1]	'	'	'	'	'	'
Unused fee-annual rate	30.00%	[2]	30.00%	[2]	0.25%	'	'	'	'	'
basis spread on variable rate	1.70%		1.60%		'	'	'	'	'	'
Credit facility term	'		'		'	'	'	'4 years	'	'
Term extension period	'		'		'	'	'	'1 year	'	'
[1]	Calculated based on one-month LIBOR plus 1.70% and 1.60% as of September 30, 2013 and December 31, 2012, respectively.
[2]	The unused fee is paid on a quarterly basis and may be reduced to 25bps of the unused amount if our unsecured revolving credit facility utilization is greater than 50% of its capacity.

Debt_Notes_Payable_Debt_Covena

Debt - Notes Payable - Debt Covenants and Restrictions (Details) (USD $)	9 Months Ended
	Sep. 30, 2013
Debt Instrument [Line Items]	'
Leverage ratio on credit facility	0.6
Fixed charge coverage ratio	1.5
Secured leverage ratio	0.4
Unencumbered leverage ratio	0.6
Unsecured interest expense ratio	1.75
Minimum tangible net worth value	$1,500,000,000
Percentage of net proceeds from future equity issuances	85.00%
Unencumbered asset value	$400,000,000
Revolving credit facility	'
Debt Instrument [Line Items]	'
Secured leverage ratio	0.45

Debt_Minimum_Principal_Payment

Debt - Minimum Principal Payments Due for Notes Payable (Details) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'
Remaining 2013	$13,278
2014	70,225
2015	148,476
2016	134,179
2017	46,355
2018	372,070
Thereafter	563,580
Total	$1,348,163

Risk_Management_and_Use_of_Fin2

Risk Management and Use of Financial Instruments - Schedule of Interest Rate Swap Derivative Instruments (Details) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Derivative [Line Items]	'		'
Period to reset variable rate on derivative	'90 days		'90 days
GBP LIBOR | Interest Rate Swap	'		'
Derivative [Line Items]	'		'
Notional Amount	22,621	[1]	22,698	[1]
Fair Value	-549	[1]	-1,015	[1]
Pay Fixed Rate	2.90%	[1]	2.90%	[1]
Receive Variable Rate	'GBP LIBOR(2)	[1]	'
Maturity Date	10-Aug-14	[1]	'
GBP LIBOR | Interest Rate Swap | Non-Qualifying Interest Rate Swap on Albion Mills Debt	'		'
Derivative [Line Items]	'		'
Notional Amount	9,249	[1],[2]	9,280	[1],[2]
Fair Value	-9	[1],[2]	-241	[1],[2]
Pay Fixed Rate	3.40%	[1],[2]	3.40%	[1],[2]
Receive Variable Rate	'GBP LIBOR(2)	[1],[2]	'
Maturity Date	10-Oct-13	[1],[2]	'
GBP LIBOR | Interest Rate Swap | Terminated Interest Rate Swap	'		'
Derivative [Line Items]	'		'
Notional Amount	0	[1],[3]	9,160	[1],[3]
Fair Value	0	[1],[3]	-182	[1],[3]
Pay Fixed Rate	'	[1],[3]	4.90%	[1],[3]
Receive Variable Rate	'GBP LIBOR(2)	[1],[3]	'
Maturity Date	30-May-13	[1],[3]	'
LIBOR | Interest Rate Swap	'		'
Derivative [Line Items]	'		'
Notional Amount	120,000		'
Fair Value	-3,741		'
Pay Fixed Rate	2.40%		'
Receive Variable Rate	'LIBOR		'
Maturity Date	31-Jan-21		'
LIBOR | Interest Rate Swap | Qualifying Interest Rate Swap on TD Term Loan	'		'
Derivative [Line Items]	'		'
Notional Amount	11,123	[4]	'
Fair Value	-228	[4]	'
Pay Fixed Rate	1.20%	[4]	'
Receive Variable Rate	'LIBOR	[4]	'
Maturity Date	6-Dec-16	[4]	'
LIBOR | Interest Rate Swap | Qualifying Interest Rate Swap on Wells Fargo Term Loan	'		'
Derivative [Line Items]	'		'
Notional Amount	200,000	[5]	'
Fair Value	1,924	[5]	'
Pay Fixed Rate	0.80%	[5]	'
Receive Variable Rate	'LIBOR	[5]	'
Maturity Date	7-Mar-18	[5]	'
LIBOR | Interest Rate Swap | Qualifying Interest Rate Swap on Atrium I Debt	'		'
Derivative [Line Items]	'		'
Notional Amount	22,750	[4]	'
Fair Value	-505	[4]	'
Pay Fixed Rate	1.60%	[4]	'
Receive Variable Rate	'LIBOR	[4]	'
Maturity Date	31-May-18	[4]	'
LIBOR | Interest Rate Swap | Qualifying Interest Rate Swap on Easton III Debt	'		'
Derivative [Line Items]	'		'
Notional Amount	200,000		'
Fair Value	-987		'
Pay Fixed Rate	1.40%		'
Receive Variable Rate	'LIBOR		'
Maturity Date	15-Jan-19		'
LIBOR | Interest Rate Swap | Qualifying Interest Rate Swap on Maskew Retail Park Debt	'		'
Derivative [Line Items]	'		'
Notional Amount	6,513	[4]	'
Fair Value	-144	[4]	'
Pay Fixed Rate	1.80%	[4]	'
Receive Variable Rate	'LIBOR	[4]	'
Maturity Date	31-Jan-19	[4]	'
LIBOR | Interest Rate Swap | Qualifying Interest Rate Swap on TD Term Loan and WF Term Loan 1	'		'
Derivative [Line Items]	'		'
Notional Amount	50,000	[5]	'	[5]
Fair Value	1,001	[5]	'	[5]
Pay Fixed Rate	1.30%	[5]	'	[5]
Receive Variable Rate	'LIBOR	[5]	'
Maturity Date	6-Mar-20	[5]	'
[1]	Based on the three month GBP-based LIBOR BBA Index with variable rate reset dates every 90 days during the term of the swaps.
[2]	We terminated the interest rate swap in October 2013. See Note 17 for additional information.
[3]	We terminated this interest rate swap in May 2013.
[4]	We assumed this swap in connection with the purchase of the Duke Portfolio on March 1, 2013. This swap is considered a hedging instrument under ASC 815-20 as of September 30, 2013. The swap was not considered a hedging instrument under ASC 815-20 during the period from March 1, 2013 to March 31, 2013.
[5]	We entered into these swaps in connection with the origination of the TD Term Loan and WF Term Loan #1 in March 2013. These swaps are considered hedging instruments under ASC 815-20 as of September 30, 2013. These swaps were not considered hedging instruments under ASC 815-20 during the period from March 11, 2013 and March 12, 2013, respectively, to May 29, 2013.

Risk_Management_and_Use_of_Fin3

Risk Management and Use of Financial Instruments - Balance Sheet Location (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Designated as Hedging Instrument	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Liability, Fair Value, Gross Liability	$6,154	'
Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	2,925	0
Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Liability, Fair Value, Gross Liability	'	1,015
Not Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Asset, Fair Value, Gross Asset	0	0
Not Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative Liability, Fair Value, Gross Liability	$9	$423

Risk_Management_and_Use_of_Fin4

Risk Management and Use of Financial Instruments - Cash Flow Hedges (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivatives, Fair Value [Line Items]	'	'	'	'
Loss Recognized in Loss on Conversion of Equity Interest to Controlling Interest	($1,414)	$0	($1,414)	$0
Cash Flow Hedging	'	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'	'
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	6,987	-1,142	3,598	-4,731
Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	-858	-1,027	-1,693	-3,068
Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	-32	-494	-38	-506
Gain (Loss) on Components Excluded from Assessment of Interest Rate Fair Value Hedge Effectiveness	221	134	1,381	380
Not Designated as Hedging Instrument	'	'	'	'
Derivatives, Fair Value [Line Items]	'	'	'	'
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	$76	($55)	$388	($145)

Future_Minimum_Rents_Schedule_

Future Minimum Rents - Schedule of Minimum Future Rents to be Received on Non-cancelable Operating Leases (Details) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Leases [Abstract]	'
Remaining 2013	$51,111
2014	202,674
2015	197,443
2016	177,573
2017	161,794
2018	152,192
Thereafter	502,173
Total	$1,444,960

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Details) (USD $)

3 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Apr. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Investment Advisor

Investment Advisor

Minimum

Maximum

Schedule of Equity Method Investments [Line Items]

'

'

'

'

'

'

'

'

'

Amount of obligation related to reimbursement of personnel costs expenses

'

'

'

'

$2,500,000

'

'

'

'

Investment management fee of all real estate investments

0.50%

'

0.50%

'

'

'

'

'

'

Investment management fee of the aggregate monthly net operating income

5.00%

'

5.00%

'

'

'

'

'

'

Percentage of acquisition fee

1.50%

'

1.50%

'

'

'

'

'

'

Percentage of purchase price of real estate investments acquired for calculating maximum acquisition consulting fees

6.00%

'

6.00%

'

'

'

'

'

'

Percentage of funds advanced with respect to mortgages for calculating maximum acquisition consulting fees

6.00%

'

6.00%

'

'

'

'

'

'

Percentage of acquisition fee

0.75%

'

0.75%

'

'

'

'

'

'

Accounts payable to related parties, current

'

'

'

'

'

100,000

11,100,000

'

'

Investment Advisory, Management and Administrative Fees [Abstract]

'

'

'

'

'

'

'

'

'

Investment Management Fees

0

5,159,000

489,000

17,270,000

'

'

'

'

'

Transition Services Agreement Fees

0

2,500,000

686,000

2,500,000

'

'

'

'

'

Acquisition-Related Fees

0

944,000

1,472,000

2,061,000

'

'

'

'

'

Property Management Fees

288,000

[1]

396,000

[1]

808,000

[1]

1,168,000

[1]

'

'

'

'

'

Leasing Commissions

154,000

[1]

292,000

[1]

693,000

[1]

581,000

[1]

'

'

'

'

'

Construction Supervision and Management Fees

0

[1]

246,000

[1]

871,000

[1]

803,000

[1]

'

'

'

'

'

Brokerage Fees

0

[2]

203,000

[2]

0

[2]

203,000

[2]

'

'

'

'

'

Other

0

0

0

26,000

'

'

'

'

'

Total

$442,000

$9,740,000

$5,019,000

$24,612,000

'

'

'

'

'

Percentage Of Gross Revenues Received From Property For Calculating Consulting Services Fees

'

'

'

'

'

'

'

2.00%

5.00%

Commission Fee Details

'

'

'(i) one-half of the competitive real estate commission or (ii) 3% of the sales price of each property sold.

'

'

'

'

'

'

Percentage Of Sales Price Of Property For Calculating Maximum Aggregate Brokerage Commission

6.00%

'

6.00%

'

'

'

'

'

'

Number of days required to determine the market value of securities after the Listing

'

'

'180 days

'

'

'

'

'

'

[1]

Such fees for each service ranged from 2.0% to 5.0% of gross revenues received from a property that we owned.

[2]

The brokerage fee upon the sale of properties was an amount equal to the lesser of (i) one-half of the competitive real estate commission or (ii) 3% of the sales price of each property sold. The total brokerage commission paid did not exceed the lesser of the competitive real estate commission or an amount equal to 6% of the sales price of the property.

NonControlling_Interest_Detail

Non-Controlling Interest (Details) (USD $)	9 Months Ended				0 Months Ended	3 Months Ended		12 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012	Aug. 19, 2013	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2012	Sep. 30, 2013
			Parent	Parent	REIT Holdings	REIT Holdings	REIT Holdings	Capital Unit, Class B	Capital Unit, Class B
					Noncontrolling Interest	Noncontrolling Interest	Noncontrolling Interest		REIT Holdings
Noncontrolling Interest [Line Items]	'	'	'	'	'	'	'	'	'
Noncontrolling Interest, Ownership Percentage by Parent	'	'	99.90%	99.90%	'	'	'	'	'
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	'	'	'	'	'	0.10%	0.10%	'	'
Number of unit in limited partnership	'	'	'	'	'	246,361	'	'	'
Stock Redeemed or Called During Period, Shares	'	'	'	'	246,361	'	'	'	'
Redeemable Noncontrolling Interest, Equity, Common, Fair Value	'	'	'	'	'	$0	'	'	'
Payments for repurchase of redeemable of noncontrolling interest	'	'	'	'	'	2,200,000	'	'	'
Adjustment to Record Non-Controlling Interest at Redemption Value	154,000	-121,000	'	'	'	'	'	'	'
Percentage of amount received to net sales proceeds	'	'	'	'	'	'	'	'	15.00%
Uncompounded return on capital contributions	'	'	'	'	'	'	'	'	7.00%
Share Price	'	'	'	'	'	'	'	'	$10.13
Number of trading days after listing	'180 days	'	'	'	'	'	'	'	'
Number of trading days for determination of market value of common share	'	'	'	'	'	'	'	'	'30 days
Asset Management Fees	'	'	'	'	'	'	'	$200,000	'

Equity_Incentive_Plan_and_Perf2

Equity Incentive Plan and Performance Bonus Plan - Narrative (Details) (USD $)

0 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

1 Months Ended

Mar. 15, 2013

Mar. 15, 2013

Sep. 30, 2013

Sep. 30, 2012

Jul. 10, 2013

21-May-13

Mar. 15, 2013

Mar. 15, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Feb. 07, 2013

Feb. 07, 2013

Feb. 07, 2013

Employees

Employees

Subsequent Event

Executive Officers and Other Senior Management

Executive Officers and Other Senior Management

Employees

Named Executive Officers and Our Employees

Named Executive Officers and Our Employees

2013 Equity Incentive Plan

2004 Equity Incentive Plan

2004 Equity Incentive Plan

2004 Equity Incentive Plan

Restricted Stock

Mr. Black

Messrs. Orphanides and Salvatore

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of common shares available for grant

'

'

'

'

'

'

'

'

'

'

4,597,500

'

'

'

Shares issued, Value

'

'

'

'

'

'

'

'

'

'

'

'

$100,000

$25,000

Stock based compensation expense

'

'

5,354,000

[1]

215,000

[1]

'

'

'

'

'

'

'

150,000

'

'

Aggregate number of restricted common shares granted to employees

'

'

'

'

'

'

281,625

117,300

'

'

'

'

'

'

Number of employees granted restricted common shares

21

21

'

'

'

'

'

'

'

'

'

'

'

'

Vesting description

'One-third of the restricted shares granted to our named executive officers and employees will vest in each of the first three anniversaries of grant if the grantee is employed by the Company on such anniversary

'

'

'

'

'

'

'

'

'

'

'

'

'

Service vesting period

'

'3 years

'

'

'

'

'

'

'

'

'

'

'

'

Estimated forfeiture rate

'

5.00%

'

'

'

'

'

'

'

'

'

'

'

'

Stock based compensation expense

'

'

'

'

'

'

'

'

316,000

684,000

'

'

'

'

Common shares granted

'

'

'

'

'

375,000

'

'

'

'

'

'

'

'

Shares vested period

'

'

'

'

'July 10, 2013

'

'

'

'

'

'

'

'

'

No of common shares granted to employees

'

'

'

'

27,500

'

'

'

'

'

'

'

'

'

Compensation expense

'

'

$3,800,000

'

'

'

'

'

'

'

'

'

'

'

[1]

Compensation Expense includes expenses incurred in our Listing Expense totaling $3.8 million.

Equity_Incentive_Plan_and_Perf3

Equity Incentive Plan and Performance Bonus Plan - Summary of Time-Based Restricted Common Shares (Details) (USD $)	9 Months Ended
	Sep. 30, 2013
Time-Based Restricted Stock	'
Shares [Abstract]	'
Nonvested, Beginning Balance	300,000
Nonvested, Granted Shares	398,925
Nonvested, Vested Shares	-100,000
Nonvested, Canceled Shares	0
Nonvested, Ending Balance	598,925
Weighted Average Grant Date Fair Value [Abstract]	'
Nonvested, Weighted-Average Grant Date Fair Value Per Share, Beginning Balance	$10
Nonvested, Weighted-Average Grant Date Fair Value Per Share, Granted	$10
Nonvested, Weighted-Average Grant Date Fair Value Per Share, Vested	$10
Nonvested, Weighted-Average Grant Date Fair Value Per Share, Canceled	$0
Nonvested, Weighted-Average Grant Date Fair Value Per Share, Ending Balance	$10
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]	'
Beginning Balance	0
Granted	0
Vested	100,000
Canceled	-33,515
Ending Balance	66,485
Performance Based Restricted Shares	'
Shares [Abstract]	'
Nonvested, Beginning Balance	375,000
Nonvested, Granted Shares	27,500
Nonvested, Vested Shares	-402,500
Nonvested, Canceled Shares	0
Nonvested, Ending Balance	0
Weighted Average Grant Date Fair Value [Abstract]	'
Nonvested, Weighted-Average Grant Date Fair Value Per Share, Beginning Balance	$10
Nonvested, Weighted-Average Grant Date Fair Value Per Share, Granted	$8.90
Nonvested, Weighted-Average Grant Date Fair Value Per Share, Vested	$9.92
Nonvested, Weighted-Average Grant Date Fair Value Per Share, Canceled	$0
Nonvested, Weighted-Average Grant Date Fair Value Per Share, Ending Balance	$0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]	'
Beginning Balance	0
Granted	0
Vested	402,500
Canceled	-144,563
Ending Balance	257,937

Equity_Incentive_Plan_and_Perf4

Equity Incentive Plan and Performance Bonus Plan - Summary of Compensation Expense and Details (Details) (USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'		'
Compensation expense recorded during the six months ended June 30, 2013	$5,354	[1]	$215	[1]
Unamortized compensation costs	4,998		6,398
Units available for the future awards	4,597,500	[2]	19,298,000	[2]
Listed	'		'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'		'
Compensation expense recorded during the six months ended June 30, 2013	$3,800		'
[1]	Compensation Expense includes expenses incurred in our Listing Expense totaling $3.8 million.
[2]	Units available for the future awards includes units under the 2013 equity incentive plan, which was the successor to the amended and restated 2004 equity incentive plan.

Shareholders_Equity_Additional

Shareholders' Equity - Additional Information (Details) (USD $)	1 Months Ended	9 Months Ended		16 Months Ended
In Millions, except Share data, unless otherwise specified	21-May-13	Sep. 30, 2013	Sep. 30, 2012	21-May-13	Dec. 31, 2012
Equity [Abstract]	'	'	'	'	'
Authorized aggregate number of shares	'	1,000,000,000	'	'	'
Common Shares of Beneficial Interest, shares authorized	'	990,000,000	'	'	990,000,000
Common Shares, Par Value	'	$0.01	$0.01	'	$0.01
Preferred shares under beneficial interest	'	10,000,000	'	'	'
Number of share issued to dividend reinvestment plan	8,869,829	'	'	'	'
Gross proceeds from public offering	'	'	'	$84.30	'
Repurchased of common shares	'	4,996,936	3,841,599	'	'
Repurchased of common shares amount	'	$47.40	$35.90	'	'

Shareholders_Equity_Components

Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Details) (USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Other Comprehensive Income (Loss) Before Reclassifications	$767	'
Repurchase and Cancellation of Common Shares	125,000	'
Beginning balance	-8,587	-23,664
Other Comprehensive (Loss) Income	2,460	-1,402
Ending balance	-6,127	-25,066
Repurchase and Cancellation of Common Shares, Shares	12,376,235	'
Common shares purchase price, Per share	$10.10	'
Reclassified From Other Comprehensive (Loss) Income	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	1,693	'
Foreign Currency Translation Loss	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Other Comprehensive Income (Loss) Before Reclassifications	2,955	'
Beginning balance	-6,164	-10,579
Other Comprehensive (Loss) Income	'	1,036
Ending balance	-3,209	-9,543
Foreign Currency Translation Loss | Reclassified From Other Comprehensive (Loss) Income	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Interest Income (Expense), Net	0	'
Swap Fair Value Adjustment	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Other Comprehensive Income (Loss) Before Reclassifications	-2,188	'
Beginning balance	-2,423	-13,085
Other Comprehensive (Loss) Income	'	-2,438
Ending balance	-2,918	-15,523
Swap Fair Value Adjustment | Reclassified From Other Comprehensive (Loss) Income	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	$1,693	'

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments and Investments - Additional Information (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]	'	'
Period to reset variable rate on derivative	'90 days	'90 days

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments and Investments - Schedule of Fair Value of Assets and Liabilities Measured On Recurring Basis (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financial Assets (Liabilities)	'	'
Class B Interest	($200)	($200)
Total Fair Value | Fair Value, Measurements, Recurring	'	'
Financial Assets (Liabilities)	'	'
Cash and Cash Equivalents	5,568	6,495
Interest rate swap not designated as cash flow hedge	-9	-423
Interest rate swaps designated as cash flow hedges - assets	2,925	'
Interest rate swaps designated as cash flow hedges - liabilities	-6,154	-1,015
Investment in CBRE Strategic Partners Asia	9,425	-8,098
Secured debt - Albion Mills	-9,338	-9,288
Class B Interest	-200	-200
Quoted Markets Prices (Level 1) | Fair Value, Measurements, Recurring	'	'
Financial Assets (Liabilities)	'	'
Cash and Cash Equivalents	5,568	6,495
Interest rate swap not designated as cash flow hedge	0	0
Interest rate swaps designated as cash flow hedges - assets	0	'
Interest rate swaps designated as cash flow hedges - liabilities	0	0
Investment in CBRE Strategic Partners Asia	0	0
Secured debt - Albion Mills	0	0
Class B Interest	0	0
Significant Observable Inputs (Level 2) | Fair Value, Measurements, Recurring	'	'
Financial Assets (Liabilities)	'	'
Cash and Cash Equivalents	0	0
Interest rate swap not designated as cash flow hedge	-9	-423
Interest rate swaps designated as cash flow hedges - assets	2,925	'
Interest rate swaps designated as cash flow hedges - liabilities	-6,154	-1,015
Investment in CBRE Strategic Partners Asia	0	0
Secured debt - Albion Mills	0	0
Class B Interest	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring	'	'
Financial Assets (Liabilities)	'	'
Cash and Cash Equivalents	0	0
Interest rate swap not designated as cash flow hedge	0	0
Interest rate swaps designated as cash flow hedges - assets	0	'
Interest rate swaps designated as cash flow hedges - liabilities	0	0
Investment in CBRE Strategic Partners Asia	9,425	-8,098
Secured debt - Albion Mills	-9,338	-9,288
Class B Interest	($200)	($200)

Fair_Value_of_Financial_Instru4

Fair Value of Financial Instruments and Investments - Investment in CBRE Strategic Partners Asia Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Investment in CBRE Strategic Partners Asia	'	'
Beginning Balance, Investment in CBRE Strategic Partners Asia	$8,098	$8,381
Contributions, Investment in CBRE Strategic Partners Asia	0	2,029
Distributions, Investment in CBRE Strategic Partners Asia	0	-2,400
Total Income (Loss) on Fair Value Adjustment, Investment in CBRE Strategic Partners Asia	1,327	-231
Translation Adjustment in Other Comprehensive Income, Investment in CBRE Strategic Partners Asia	0	0
Ending Balance, Investment in CBRE Strategic Partners Asia	9,425	7,779
Secured debt - Albion Mills	'	'
Beginning Balance, Note Payable	-9,288	-8,775
Contributions, Note Payable	0	0
Distributions, Note Payable	0	0
Total Income (Loss) on Fair Value Adjustment, Note Payable	-78	-85
Translation Adjustment in Other Comprehensive Income, Note Payable	28	-348
Ending Balance, Note Payable	($9,338)	($9,208)

Fair_Value_of_Financial_Instru5

Fair Value of Financial Instruments and Investments - Summary of Notes Payable and Estimated Fair Value (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Secured Notes Payable, Net	$694,679		$502,232
Unsecured Credit Facility	100,000		265,000
Book Value | Secured Debt	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Secured Notes Payable, Net	685,341	[1]	492,944	[1]
Secured debt - Albion Mills	9,338	[1]	9,288	[1]
Total Secured Notes Payable	694,679	[1]	502,232	[1]
Book Value | Unsecured Debt	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Unsecured Term Loan Facilities	570,000	[1]	0	[1]
Unsecured Credit Facility	100,000	[1]	265,000	[1]
Fair Value | Secured Debt	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Secured Notes Payable, Net	732,794	[1]	514,451	[1]
Secured debt - Albion Mills	9,338	[1]	9,288	[1]
Total Secured Notes Payable	742,132	[1]	523,739	[1]
Fair Value | Unsecured Debt	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Unsecured Term Loan Facilities	570,000	[1]	0	[1]
Unsecured Credit Facility	$100,000	[1]	$265,000	[1]
[1]	Level 3: For purposes of this fair value disclosure, we based our fair value estimate for notes payable on our internal valuation that includes a representative sample of our lenders’ market interest rate quotes as of September 30, 2013 and December 31, 2012 for debt with similar risk characteristics and maturities. We based our notes payable secured by our Albion Mills property carried at fair value on a third party appraiser’s valuation, which used similar techniques as our internal valuation model as of September 30, 2013 and December 31, 2012.

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Details)	1 Months Ended	9 Months Ended		1 Months Ended
	Jun. 13, 2013	Sep. 30, 2013	Sep. 30, 2012	Jun. 13, 2013	Jun. 13, 2013	Jun. 13, 2013	Jun. 13, 2013
		USD ($)	USD ($)	European JV	European JV	Goodman Group	Amazon
				USD ($)	EUR (€)		sqft
Commitments And Contingencies [Line Items]	'	'	'	'	'	'	'
Purchase and sale agreement, acquisitions	'	$114,457,000	$127,300,000	$69,600,000	€ 51,200,000	'	'
Purchase and sale agreement, exchange rate	'	'	'	1.36	'	'	'
Exchange rate of pro rata share	'	'	'	$55,700,000	'	'	'
Percentage of pro rata share	'	'	'	80.00%	80.00%	'	'
Purchase and sale agreement, interest owned	'	'	'	80.00%	80.00%	20.00%	'
Rentable square feet	'	'	'	'	'	'	774,526
Percentage of leased property	'	'	'	'	'	'	100.00%
Lease agreement period	'12 years	'	'	'	'	'	'
Percentage of annual CPI adjustment	100.00%	'	'	'	'	'	'
Percentage of annual CPI adjustment capped	3.00%	'	'	'	'	'	'

Commitments_and_Contingencies_2

Commitments and Contingencies - Maturity of Ground Lease (Details) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'
Remainder 2013	$61
2014	273
2015	273
2016	273
2017	273
2018	276
Thereafter	4,782
Total	$6,211

Segment_Disclosure_Narrative_D

Segment Disclosure - Narrative (Details)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
	segments	Property
Segment Reporting [Abstract]	'	'
Number of reportable segments	3	3

Segment_Disclosure_Comparison_

Segment Disclosure - Comparison of Net Operating Income (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'	'
Rental	$51,162	$37,980	$146,312	$109,866
Tenant Reimbursements	14,178	9,167	40,090	25,566
Total Revenues	65,340	47,147	186,402	135,432
Property and Related Expenses:	'	'	'	'
Real Estate Taxes	9,929	6,752	28,710	17,538
Total Expenses	52,208	50,323	159,850	127,673
Net Operating Income	46,786	35,247	135,019	101,412
Operating Segments | Domestic Industrial Properties	'	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'	'
Rental	13,729	11,880	40,792	31,645
Tenant Reimbursements	3,475	2,077	12,331	6,995
Total Revenues	17,204	13,957	53,123	38,640
Property and Related Expenses:	'	'	'	'
Operating and Maintenance	1,009	842	3,175	2,524
Real Estate Taxes	3,452	2,086	11,092	6,127
Total Expenses	4,461	2,928	14,267	8,651
Net Operating Income	12,743	11,029	38,856	29,989
Operating Segments | Domestic Office Properties	'	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'	'
Rental	35,683	24,230	100,279	72,862
Tenant Reimbursements	10,615	6,996	27,499	18,314
Total Revenues	46,298	31,226	127,778	91,176
Property and Related Expenses:	'	'	'	'
Operating and Maintenance	7,345	4,062	19,075	13,214
Real Estate Taxes	6,477	4,666	17,618	11,411
Total Expenses	13,822	8,728	36,693	24,625
Net Operating Income	32,476	22,498	91,085	66,551
Operating Segments | International Office/Retail Properties	'	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'	'
Rental	1,750	1,870	5,242	5,359
Tenant Reimbursements	88	94	258	257
Total Revenues	1,838	1,964	5,500	5,616
Property and Related Expenses:	'	'	'	'
Operating and Maintenance	271	244	422	744
Real Estate Taxes	0	0	0	0
Total Expenses	271	244	422	744
Net Operating Income	$1,567	$1,720	$5,078	$4,872

Segment_Disclosure_Reconciliat

Segment Disclosure - Reconciliation to Consolidated Net Income (Loss) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reconciliation to Consolidated Net Income (Loss)	'	'	'	'
Total Segment Net Operating Income	$46,786	$35,247	$135,019	$101,412
Expenses:	'	'	'	'
General and Administrative	5,397	7,162	17,710	10,973
Investment Management Fee	0	5,159	489	17,270
Acquisition-Related	175	1,099	2,179	2,508
Depreciation and Amortization	26,635	18,787	75,409	54,749
Transition and Listing	1,447	6,216	12,681	8,152
Gross Loss	13,132	-3,176	26,551	7,760
OTHER INCOME AND EXPENSES	'	'	'	'
Interest and Other Income	551	229	1,028	1,714
Interest Expense	-13,120	-8,737	-33,953	-26,528
Gain on Interest Rate Swaps	265	134	1,731	380
Loss on Early Extinguishment of Debt	-1,572	-1,686	-1,572	-1,686
Conversion of Duke JV Equity Investment to Controlling Interest	-1,667	0	75,535	0
Loss Before Provision for Income Taxes and Equity in Income of Unconsolidated Entities	-2,411	-13,236	69,321	-18,361
Provision For Income Taxes	-54	-75	-274	-217
Equity in Income of Unconsolidated Entities	3,324	927	10,263	2,556
Income (Loss) from Continuing Operations	859	-12,384	79,310	-16,022
DISCONTINUED OPERATIONS	'	'	'	'
Realized Loss from Sale	0	0	0	-415
Loss from Discontinued Operations	0	0	0	-415
NET INCOME (LOSS)	$859	($12,384)	$79,310	($16,437)

Segment_Disclosure_Condensed_A

Segment Disclosure - Condensed Assets (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Segment Reporting, Asset Reconciling Item [Line Items]	'		'
Total Assets	$2,991,157		$2,554,862
Operating Segments | Domestic Industrial Properties	'		'
Segment Reporting, Asset Reconciling Item [Line Items]	'		'
Total Assets	743,776		678,930
Operating Segments | Domestic Office Properties	'		'
Segment Reporting, Asset Reconciling Item [Line Items]	'		'
Total Assets	1,616,881		1,077,328
Operating Segments | International Office/Retail Properties	'		'
Segment Reporting, Asset Reconciling Item [Line Items]	'		'
Total Assets	103,396		105,502
Corporate, Non-Segment | Non-Segment Assets	'		'
Segment Reporting, Asset Reconciling Item [Line Items]	'		'
Total Assets	527,104	[1]	616,276	[1]
Corporate, Non-Segment | Variable Interest Entity	'		'
Segment Reporting, Asset Reconciling Item [Line Items]	'		'
Total Assets	$0		$76,826
[1]	Non-segment assets primarily include our investments in unconsolidated entities.

Earnings_Per_Share_Attributabl2

Earnings Per Share Attributable to Common Shareholders (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]	'	'	'	'
Income (Loss) from Continuing Operations	$859	($12,384)	$79,310	($16,022)
(Income) Loss from Continuing Operations Attributable to Noncontrolling Interests	3	-5	83	-7
Allocation to Participating Securities (Nonvested Time-Based Shares)	-75	-45	-285	-45
Numerator for basic and diluted (loss) income from continuing operations available to common shareholders	781	-12,424	78,942	-16,060
Loss from Discontinued Operations	0	0	0	-415
Numerator for Basic and Diluted Income (Loss) Available to Common Shareholders	$781	($12,424)	$78,942	($16,475)
Basic Weighted Average Vested Shares Outstanding	236,548,477	249,173,577	244,373,249	247,718,798
Diluted Weighted Average Vested Shares Outstanding	236,548,477	249,173,577	244,373,249	247,718,798
Income (Loss) from Continuing Operations Available to Common Shareholders per Share	$0	($0.05)	$0.32	($0.07)
Income (Loss) from Discontinued Operations Available to Common Shareholders per Share	$0	$0	$0	$0
Net Income (Loss) Available to Common Shareholders per Share	$0	($0.05)	$0.32	($0.07)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	375,000	'	375,000	'

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Details)	1 Months Ended	0 Months Ended					0 Months Ended
	Jul. 02, 2013	Nov. 07, 2013	Nov. 07, 2013	Oct. 10, 2013	Nov. 07, 2013	Nov. 07, 2013	Oct. 09, 2013	Oct. 09, 2013
	Duke Joint Venture	Subsequent Event	Subsequent Event	Subsequent Event	Subsequent Event	Subsequent Event	Subsequent Event	Subsequent Event
	USD ($)	USD ($)	Duke Joint Venture	Duke Joint Venture	CSP OP	CSP OP	Albion Mills Retail Park	Albion Mills Retail Park
	Mortgages		USD ($)	USD ($)	distribution_agreements	Maximum	USD ($)	GBP (£)
				Mortgages		USD ($)
Subsequent Event [Line Items]	'	'	'	'	'	'	'	'
Repayments of Long-term Debt	'	'	'	'	'	'	$9,300,000	£ 5,800,000
Mortgage notes contributions	79,800,000	'	'	40,700,000	'	'	'	'
Percentage of Mortgage notes share	80.00%	'	'	80.00%	'	'	'	'
Number of fixed rate mortgage notes	5	'	'	2	'	'	'	'
Reimburse portion of loan	'	'	'	50,800,000	'	'	'	'
Number of equity distribution agreements	'	'	'	'	4	'	'	'
Equity purchase agreement, value	'	'	'	'	'	250,000,000	'	'
Proceeds from Sale of Buildings	'	$11,000,000	$39,200,000	'	'	'	'	'