Consolidated Balance Sheets (USD $)	Jun. 30, 2013	Dec. 31, 2012
ASSETS
Land	$ 328,053,350	$ 283,445,257
Building and improvements	721,898,820	588,248,338
	1,049,952,170	871,693,595
Less: accumulated depreciation	43,370,524	32,364,772
	1,006,581,646	839,328,823
Mortgage note receivable	10,294,000	10,000,000
Investment in and advances to unconsolidated joint venture	15,566,659	15,295,223
Real Estate Investments, net	1,032,442,305	864,624,046
Cash and cash equivalents	6,393,868	4,692,230
Restricted cash	2,059,741	1,700,692
Tenant and other receivables	15,008,749	12,455,190
Deposits	2,250,000	2,000,000
Acquired lease intangible asset, net of accumulated amortization	42,299,617	41,230,616
Prepaid expenses	685,801	1,245,778
Deferred charges, net of accumulated amortization	23,432,476	21,623,474
Other	2,308,375	1,339,501
Total assets	1,126,880,932	950,911,527
Liabilities:
Term loan	200,000,000	200,000,000
Credit facility	105,150,000	119,000,000
Mortgage notes payable	81,143,101	72,689,842
Acquired lease intangibles liability, net of accumulated amortization	57,485,197	57,371,803
Accounts payable and accrued expenses	5,964,544	6,468,580
Tenants' security deposits	3,062,637	2,336,680
Other liabilities	16,004,904	26,502,551
Total liabilities	468,810,383	484,369,456
Commitments and contingencies
Equity:
Preferred stock, $.0001 par value 50,000,000 shares authorized; none issued and outstanding	0	0
Common stock, $.0001 par value 500,000,000 shares authorized; and 71,843,084 and 52,596,754 shares issued and outstanding at June 30, 2013 and December 31, 2012	7,178	5,260
Additional paid-in-capital	722,675,337	523,540,268
Cumulative distributions in excess of net income	(54,892,307)	(38,851,234)
Accumulated other comprehensive loss	(9,722,048)	(18,154,612)
Total Retail Opportunity Investments Corp. stockholders' equity	658,068,160	466,539,682
Noncontrolling interests	2,389	2,389
Accumulated other comprehensive loss	(9,722,048)	(18,154,612)
Total equity	658,070,549	466,542,071
Total liabilities and equity	1,126,880,932	950,911,527
Total liabilities and capital	1,126,880,932	950,911,527
Retail Opportunity Investments Partnership L.P. [Member]
ASSETS
Land	328,053,350	283,445,257
Building and improvements	721,898,820	588,248,338
	1,049,952,170	871,693,595
Less: accumulated depreciation	43,370,524	32,364,772
	1,006,581,646	839,328,823
Mortgage note receivable	10,294,000	10,000,000
Investment in and advances to unconsolidated joint venture	15,566,659	15,295,223
Real Estate Investments, net	1,032,442,305	864,624,046
Cash and cash equivalents	6,393,868	4,692,230
Restricted cash	2,059,741	1,700,692
Tenant and other receivables	15,008,749	12,455,190
Deposits	2,250,000	2,000,000
Acquired lease intangible asset, net of accumulated amortization	42,299,617	41,230,616
Prepaid expenses	685,801	1,245,778
Deferred charges, net of accumulated amortization	23,432,476	21,623,474
Other	2,308,375	1,339,501
Total assets	1,126,880,932	950,911,527
Liabilities:
Term loan	200,000,000	200,000,000
Credit facility	105,150,000	119,000,000
Mortgage notes payable	81,143,101	72,689,842
Acquired lease intangibles liability, net of accumulated amortization	57,485,197	57,371,803
Accounts payable and accrued expenses	5,964,544	6,468,580
Tenants' security deposits	3,062,637	2,336,680
Other liabilities	16,004,904	26,502,551
Total liabilities	468,810,383	484,369,456
Equity:
Accumulated other comprehensive loss	(9,722,048)	(18,154,612)
Noncontrolling interests	2,389	2,389
General partner’s capital	667,790,208	484,694,294
Accumulated other comprehensive loss	(9,722,048)	(18,154,612)
Total partners’ capital	658,068,160	466,539,682
Total equity	658,070,549	466,542,071
Total liabilities and equity	1,126,880,932	950,911,527
Total liabilities and capital	$ 1,126,880,932	$ 950,911,527