Investment in Office and Parking Properties - Schedule of Purchase Price Allocation for Deerwood and Lincoln Place (Details) (Tower Place 200, Deerwood North and South, Lincoln Place, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Tower Place 200, Deerwood North and South, Lincoln Place
Business Acquisition [Line Items]
Land	$ 31,337
Buildings	178,362
Tenant improvements	18,410
Leasing commissions	9,448
Lease in place value	20,131
Above market leases	4,969
Below market leases	(9,267)
Mortgage premium assumed	(2,728)
Mortgage debt assumed	$ (133,817)