SUBSEQUENT EVENTS (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Feb. 22, 2013 Secured Debt [Member] Mortgages [Member]	Jul. 24, 2013 Subsequent Event [Member] 1635 N. Cahuenga Building [Member] Secured Debt [Member] Mortgages [Member]		Jul. 10, 2013 Subsequent Event [Member] Central Building [Member] sqft acre	Jul. 11, 2013 Subsequent Event [Member] 50 Congress Street [Member] sqft acre
Subsequent Event [Line Items]
Net rentable area				191,784	179,872
Area of land				0.6	0.4
Contractual purchase price				$ 34.5	$ 51.0
Percent of property leased				82.00%	88.00%
Term of credit facility	4 years	3
Current capacity		6.7
Ownership interest		70.00%
Amount outstanding		4.7
Unused borrowing capacity, amount		$ 2.0
Basis spread on variable rate	2.25%	2.35%	[1],[2]
Description of variable rate basis		one-month LIBOR

[1] See “Recent Transactions- Portfolio Mortgage Loan” below.

[2] Contractual interest rate represents the interest rate in effect under the loan as of June 30, 2013. Effective interest rate is calculated as the actual interest rate in effect as of June 30, 2013 (consisting of the contractual interest rate and contractual floor rates), using interest rate indices at June 30, 2013, where applicable.