NOTES PAYABLE AND REPURCHASE AGREEMENTS (Schedule of Long-term Debt Instruments) (Details) (USD $)	6 Months Ended				6 Months Ended						6 Months Ended
	Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2012 Mortgages [Member] Richardson Portfolio [Member]		Dec. 31, 2011 Mortgages [Member] Richardson Portfolio [Member]		Jun. 30, 2012 Mortgages [Member] 1635 N. Cahuenga Building [Member]	Dec. 31, 2011 Mortgages [Member] 1635 N. Cahuenga Building [Member]	Jun. 30, 2012 Richardson Joint Venture [Member] Mortgages [Member]	Nov. 23, 2011 Richardson Joint Venture [Member] Mortgages [Member]	Jun. 30, 2012 Richardson Joint Venture [Member] Minimum [Member] Mortgages [Member]
Debt Instrument [Line Items]
Total Notes Payable and Repurchase Agreements	$ 48,795,000		$ 63,203,000		$ 30,618,000	[1]	$ 29,525,000	[1]	$ 0	$ 3,477,000		$ 46,100,000
Repurchase Agreements	18,177,000	[2]	30,201,000	[2]
Debt Instrument, Description of Variable Rate, Basis					LIBOR						Three-month LIBOR
Debt Instrument, Basis Spread on Variable Rate					1.25%						4.00%
Debt Instrument, Interest Rate, Effective Percentage	1.49%	[2],[3]			6.25%	[1],[3]
Debt Instrument, Payment Terms	Interest Only	[2]			Interest Only	[1]
Debt Instrument, Maturity Date	Jul. 19, 2012	[2],[4]			Nov. 30, 2015	[1],[4]
Amount outstanding											30,600,000	29,500,000
Unused borrowing capacity, amount											$ 15,500,000	$ 16,600,000
Contractual Interest Rate, Percentage											6.25%		6.25%
Term of credit facility											4 years

[1] On November 23, 2011, the Richardson Joint Venture entered into a four-year mortgage loan for borrowings up to $46.1 million. At closing, $29.5 million (the “Initial Funding”) had been disbursed to the Richardson Joint Venture and $16.6 million (the “Holdback”) remained available for future disbursements, subject to certain conditions set forth in the loan agreement. As of June 30, 2012, $30.6 million had been disbursed to the Richardson Joint Venture and $15.5 million of the Holdback remains available for future disbursements, subject to certain conditions set forth in the loan agreement. Interest on the Initial Funding is calculated at a fixed rate of 6.25% during the initial term of the loan. Interest on the Holdback is calculated at a variable annual rate of 400 basis points over three-month LIBOR, but at no point shall the interest rate be less than 6.25%.

[2] See “– Repurchase Agreements” below.

[3] Contractual interest rate represents the interest rate in effect under the loan as of June 30, 2012. Effective interest rate is calculated as the actual interest rate in effect as of June 30, 2012 (consisting of the contractual interest rate and contractual floor rates), using interest rate indices at June 30, 2012, where applicable.

[4] Represents the initial maturity date or the maturity date as extended as of June 30, 2012; subject to certain conditions, the maturity dates of certain loans may be extended beyond the date shown.