Subsequent Events Subsequent Events (Details) (USD $)	0 Months Ended	9 Months Ended		9 Months Ended	0 Months Ended		0 Months Ended			9 Months Ended				0 Months Ended
	Jul. 15, 2014	Sep. 30, 2014	Sep. 30, 2014 Mortgage notes payable	Sep. 30, 2014 Mortgage notes payable 1350 Broadway - 2nd Lien Mortgage Loan [Member]	Oct. 01, 2014 Mortgage notes payable 1350 Broadway - 2nd Lien Mortgage Loan [Member] Subsequent Event [Member]	Sep. 30, 2014 Mortgage notes payable Metro Center Debt [Member]	Oct. 01, 2014 Mortgage notes payable Metro Center Debt [Member] Subsequent Event [Member]	Oct. 01, 2014 Mortgage notes payable Metro Center Debt [Member] Subsequent Event [Member]	Oct. 01, 2014 Mortgage notes payable One Grand Central Place - Fourth Lien [Member] Subsequent Event [Member]	Sep. 30, 2014 Prime Rate [Member] Mortgage notes payable 1350 Broadway - 2nd Lien Mortgage Loan [Member]		Dec. 31, 2013 Prime Rate [Member] Mortgage notes payable 1350 Broadway - 2nd Lien Mortgage Loan [Member]		Oct. 01, 2014 LIBOR [Member] Mortgage notes payable One Grand Central Place - Fourth Lien [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
Repayments of Long-term Debt		$ 57,478,000		$ 13,700,000	$ 13,700,000
Total consideration paid	733,600,000
Proceeds from credit facility		295,600,000					100,000,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months			108,137,000
Stated Rate						5.89%		3.59%				4.25%	[1]
Debt Instrument, Face Amount									$ 91,000,000
Basis spread on variable rate										1.00%	[1]			1.35%	[2]

[1] Interest at the greater of 4.25% and Prime plus 1.0%. The rate at September 30, 2014 was 4.25%.

[2] Floating at 30 day LIBOR plus 1.20%. The rate as of September 30, 2014 was 1.36%.