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v3.7.0.1

Commitments and Contingencies (Textual) (Details) |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 02, 2017 ft² property | Dec. 03, 2015 ft² | Apr. 02, 2015 USD ($) | Jun. 30, 2017 USD ($) a property | Aug. 01, 2017 USD ($) | Jul. 01, 2016 USD ($) a Parcel
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Expected acquisition date for replacement property |  |  |  | Aug. 01, 2017 |  |
Latest acquisition date to avoid payment of tax liability |  |  |  | Aug. 01, 2017 |  |
Loss contingency on acquisition of replacement property |  |  |  | $ 0 |  |
Subaru Corporate Headquarters Project [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
NTE Amount |  |  |  | 79,400,000 |  |
Subaru Build-to-Service Center Project [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Lease terms |  | 18 years |  |  |  |
Rentable Square Feet | ft² |  | 83,000 |  |  |  |
Purchase option of lease from inception period |  | 5 years |  |  |  |
Estimated project costs |  |  |  | 44,300,000 |  |
Subaru Build-to-Service Center Project [Member] | Other Assets [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Project costs funded |  |  |  | $ 11,300,000 |  |
Concord Airport Plaza [Member] | Subsequent Event [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Purchase commitment amount to satisfy tax liabilities |  |  |  |  | $ 13,500,000 |
Office Properties [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  |  |  | 12 |  |
Office Properties [Member] | Concord Airport Plaza [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Number of Properties Sold | property | 2 |  |  |  |  |
Rentable Square Feet | ft² | 350,256 |  |  |  |  |
1919 Venture [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Guarantees, maximum exposure amount |  |  |  | $ 88,900,000 |  |
Unconsolidated Real Estate Ventures [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Real estate ventures aggregate indebtedness to third parties |  |  |  | 952,700,000 |  |
evo at Cira Centre South Venture [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Guarantees, maximum exposure amount |  |  |  | 55,400,000 |  |
PJP VII [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Guarantees, maximum exposure amount |  |  |  | 400,000 |  |
618 Market Street [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Contingent consideration, liability |  |  | $ 2,000,000 | $ 1,800,000 |  |
Fair value of contingent consideration |  |  | 1,600,000 |  |  |
Interest expense |  |  | $ 2,000,000 |  |  |
Garza Land Acquisition [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Acreage of land | a |  |  |  |  |  | 34.6
Number of Parcels | Parcel |  |  |  |  |  | 2
Garza Land Acquisition [Member] | Parcel One [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Area of land sold | a |  |  |  | 8.4 |  |
Garza Land Acquisition [Member] | Parcel Two [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Area of land sold | a |  |  |  | 1.7 |  |
Garza Land Acquisition [Member] | A1000 Atrium Way And Libertyview |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Infrastructure improvements to land, estimated cost |  |  |  |  |  | $ 14,300,000
Put Agreement [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Purchase price |  |  |  | $ 35,000,000 |  |
Minimum [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Lease terms |  |  |  | 12 years |  |
Maximum [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Lease terms |  |  |  | 72 years |  |
Mortgage Lenders [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Associated letter of credit |  |  |  | $ 10,000,000 |  |

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