| # | Building | Units over $1M | Est. tax / year |
|---|---|---|---|
| 1 | 10 Madison Square West | 63 of 122 | $3,715,306 |
| 2 | Madison Square Park Tower | 39 of 82 | $2,610,563 |
| 3 | One Madison | 33 of 64 | $2,238,587 |
| 4 | 212 Fifth Avenue | 25 of 47 | $1,928,916 |
| 5 | 18 Gramercy Park South | 16 of 16 | $1,336,601 |
| 6 | 121 East 22nd | 20 of 140 | $1,128,947 |
| 7 | 15 Union Square West | 18 of 34 | $949,598 |
| 8 | 277 Fifth Avenue | 13 of 129 | $766,403 |
| 9 | 141 Fifth Avenue | 7 of 34 | $334,101 |
| 10 | 240 Park Avenue South | 5 of 48 | $260,080 |
Total annual surcharge estimated at the flat Phase-1 rates on each unit's full DOF market value (FY2026–27 roll); applies to non-primary residences only. "Units over $1M" counts residences whose DOF market value clears the threshold. Ranking covers the 10 Flatiron & Gramercy buildings in our trophy database.
Where they are
Pins are numbered by rank; tap one for the building and its analysis. Locations are the buildings' true street addresses.
What the ranking shows
Exposure isn't about how big a building is — it's about how much of it sits above $1M in DOF value. 10 Madison Square West tops the list with 122 units, 52% of them over the threshold. 121 East 22nd, by contrast, has 140 units but only 14% over the line, which is why it ranks lower despite its size. The tax rewards a specific profile: newer, high-floor, ultra-prime — and that is what decides the order above.
For owners, the number that matters isn't the building's total — it's their own unit's DOF market value, which is almost always far below the sale price. A residence that traded for $20M might carry a DOF value of $4M and owe 5.25% of that. The only way to know is to look it up.
Where does your unit land?
The free review pulls your official DOF market value, runs the exact surcharge, and shows what a lease or a sale would change — usually within the hour.
Check My Unit — FreeDisclaimer & method. Educational information from Conquest, a licensed New York real estate brokerage — not legal, tax, or accounting advice. Building figures are computed from the FY2026–27 DOF assessment roll at the statutory flat Phase-1 rates (4% $1–3M, 5.25% $3–5M, 6.5% over $5M) on each unit's full DOF market value, and represent exposure if every over-threshold unit were a non-primary residence; actual liability depends on each owner's occupancy and exemptions. Sale prices are recorded deeds from ACRIS.