Commitments and Contingencies (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Commitments and Contingencies [Line Items]
Number of single tenants accounting for more than 10% or more of total annualized base rent	0
Asset retirement obligation	$ 657,000	$ 654,000
Expected capital expenditures and lease costs through 2013	3,900,000
Tax Indemnity Accrual	0	8,725,000
Notes Payable, Related Parties	29,433,000	21,104,000
Affiliated Entity
Commitments and Contingencies [Line Items]
Restriction period on sale of contributed properties not providing continued tax deferral to Venture (in years)	10 years
Notes Payable, Related Parties	29,400,000
Waterfront Plaza
Commitments and Contingencies [Line Items]
Annual rental obligations, fixed increase intervals (in years)	5 years
Percent of fair market value of land used to determine annual rental obligation	8.00%
Asset retirement obligation	400,000	400,000
First Insurance Center
Commitments and Contingencies [Line Items]
Tax Indemnity Settlement Payment	400,000
First Insurance Center | Affiliated Entity
Commitments and Contingencies [Line Items]
Notes Payable, Related Parties	$ 8,300,000