Organization And Basis Of Presentation (Details)
$ in Millions |
12 Months Ended |
|
|
Dec. 31, 2017
USD ($)
ft²
state
property
item
|
Dec. 31, 2016
USD ($)
|
| Real Estate Properties [Line Items] |
|
|
| Percentage of ownership interest |
89.60%
|
89.50%
|
| Number of properties owned or investment interests |
157
|
|
| Aggregate square feet of the property owned or investment interest | ft² |
17,700,000
|
|
| Number of states where properties are located | state |
6
|
|
| Consolidated joint ventures, total real estate assets | $ |
$ 215.5
|
$ 201.9
|
| Consolidated joint ventures, mortgages | $ |
81.2
|
78.4
|
| Consolidated joint ventures, other liabilities | $ |
$ 19.3
|
$ 19.2
|
| Commercial Properties [Member] |
|
|
| Real Estate Properties [Line Items] |
|
|
| Number of tenants | item |
900
|
|
| Multi-Family Properties [Member] |
|
|
| Real Estate Properties [Line Items] |
|
|
| Number of properties owned or investment interests |
18
|
|
| Number of units | item |
5,826
|
|
| Office And Office/Flex Buildings [Member] |
|
|
| Real Estate Properties [Line Items] |
|
|
| Number of properties owned or investment interests |
56
|
|
| Aggregate square feet of the property owned or investment interest | ft² |
3,100,000
|
|
| Office [Member] |
|
|
| Real Estate Properties [Line Items] |
|
|
| Number of properties owned or investment interests |
69
|
|
| Aggregate square feet of the property owned or investment interest | ft² |
14,100,000
|
|
| Flex Properties [Member] |
|
|
| Real Estate Properties [Line Items] |
|
|
| Number of properties owned or investment interests |
70
|
|
| Unconsolidated Joint Venture Office Buildings [Member] |
|
|
| Real Estate Properties [Line Items] |
|
|
| Number of properties owned or investment interests |
4
|
|
| Aggregate square feet of the property owned or investment interest | ft² |
500,000
|
|
| Industrial/Warehouse Facilities [Member] |
|
|
| Real Estate Properties [Line Items] |
|
|
| Number of properties owned or investment interests |
6
|
|
| Aggregate square feet of the property owned or investment interest | ft² |
387,400
|
|
| Unconsolidated Joint Venture Multi-Family Properties [Member] |
|
|
| Real Estate Properties [Line Items] |
|
|
| Number of properties owned or investment interests |
8
|
|
| Number of units | item |
3,275
|
|
| Unconsolidated Joint Venture Office/Flex Buildings And Hotel [Member] |
|
|
| Real Estate Properties [Line Items] |
|
|
| Number of properties owned or investment interests |
1
|
|
| Parking/Retail [Member] |
|
|
| Real Estate Properties [Line Items] |
|
|
| Number of properties owned or investment interests |
6
|
|
| Aggregate square feet of the property owned or investment interest | ft² |
137,100
|
|
| Unconsolidated Joint Venture Parking/Retail Buildings [Member] |
|
|
| Real Estate Properties [Line Items] |
|
|
| Number of properties owned or investment interests |
2
|
|
| Aggregate square feet of the property owned or investment interest | ft² |
81,700
|
|
| Land [Member] |
|
|
| Real Estate Properties [Line Items] |
|
|
| Number of properties owned or investment interests |
1
|
|