| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| REVENUES | | | | | | | | |
| Rental revenues | 206.1 | 199.1 | 226.4 | 232.8 | 230.6 | 226.9 | 207.9 | 200.8 |
| Rental revenues growth | 3.5% | -12.0% | -2.8% | 1.0% | 1.6% | 9.1% | 3.5% | 2.2% |
| EXPENSES | | | | | | | | |
| Operating, including fees to Vornado of $1,539 and $1,378, respectively | -91.1 | -88.4 | -89.7 | -93.8 | -85.1 | 82.2 | 76.2 | 69.9 |
| Depreciation and amortization | 32.9 | 32.4 | 31.4 | 33.1 | 34.9 | 33.8 | 31.1 | 29.2 |
| General and administrative, including management fees to Vornado of $610 in each period | 5.9 | 6.3 | 5.8 | 5.3 | 5.3 | 5.4 | 5.4 | 5.0 |
| Total expenses | 130.0 | 127.1 | 126.9 | 132.2 | 125.3 | 121.5 | 112.7 | 104.1 |
| Interest and other income | 0.6 | 2.7 | 8.2 | 12.5 | 6.7 | 3.3 | 5.9 | 2.4 |
| Interest and debt expense | -19.7 | -24.2 | -38.9 | -44.5 | -31.5 | -22.2 | -24.2 | -32.1 |
| Net income | 132.9 | 41.9 | 60.1 | 32.8 | 80.5 | 86.5 | 76.9 | 67.9 |
| |
| Net income per common share - basic (in usd per share) | $25.94 | $8.19 | $11.74 | $6.42 | $15.74 | $16.91 | $15.04 | $13.29 |
| Net income per common share - diluted (in usd per share) | $25.94 | $8.19 | $11.74 | $6.42 | $15.74 | $16.91 | $15.04 | $13.29 |
| |
| Weighted average shares outstanding - basic (in shares) | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 |
| Weighted average shares outstanding - diluted (in shares) | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 | 5.1 |