Recent Transactions (Schedule Of Properties Acquired) (Details) |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2019
USD ($)
ft²
item
|
Dec. 31, 2020
USD ($)
|
|
| Business Acquisition [Line Items] | ||
| Number of Buildings, Acquired | item | 3 | |
| Acquisition cost | $ 736,919,000 | |
| 99 Wood Avenue [Member] | ||
| Business Acquisition [Line Items] | ||
| Number of Buildings, Acquired | item | 1 | |
| Rentable Square Feet, Acquired | ft² | 271,988 | |
| Acquisition cost | $ 61,858,000 | |
| Soho Lofts [Member] | ||
| Business Acquisition [Line Items] | ||
| Number of Buildings, Acquired | item | 1 | |
| Rentable Square Feet, Acquired | ft² | 377 | |
| Acquisition cost | $ 264,578,000 | |
| Liberty Towers [Member] | ||
| Business Acquisition [Line Items] | ||
| Number of Buildings, Acquired | item | 1 | |
| Rentable Square Feet, Acquired | ft² | 648 | |
| Acquisition cost | $ 410,483,000 | |
| Unsecured Revolving Credit Facility [Member] | Liberty Towers [Member] | ||
| Business Acquisition [Line Items] | ||
| Mortgage loan | $ 232,000,000 |