ZIP codes 10010 · DOF roll date July 24, 2026
What the roll says about Flatiron, Gramercy & Union Square
Across Flatiron, Gramercy & Union Square, the Department of Finance's roll lists 3,657 condo and co-op units, and 415 of them — 11% — carry a DOF market value over the $1,000,000 Phase-1 threshold. Each of those units owes a flat 4%–6.5% of its full DOF market value for any year it is not someone's primary residence. If every exposed unit here paid with no exemption, the neighborhood's combined bill would be $27.3M a year — the ceiling, not the forecast, since primary residents and 12-month-leased units owe nothing.
The threshold test uses the DOF market value — the "Market Value" line on the Notice of Property Value — not the assessed value and not what the apartment last sold for. In Flatiron, Gramercy & Union Square the median DOF value among exposed units is $1.3M; across all units it is $401K. Co-ops are valued by DOF's fractional-share method, which can surprise shareholders on the high side.
The most exposed buildings in Flatiron, Gramercy & Union Square
Ranked by combined maximum annual surcharge of over-threshold units. Buildings with a full Conquest write-up are linked.
| Building | ZIP | Units | Over $1M | Top DOF value | Max surcharge/yr |
|---|---|---|---|---|---|
| 1107 Broadway | 10010 | 122 | 63 | $3.5M | $3.7M |
| 45 East 22 Street | 10010 | 82 | 39 | $4.0M | $2.6M |
| 23 East 22 Street | 10010 | 64 | 33 | $4.0M | $2.2M |
| 212 5 Avenue | 10010 | 47 | 25 | $6.6M | $1.9M |
| 24 East 21 Street | 10010 | 8 | 8 | $4.0M | $1.2M |
| 121 East 22 Street | 10010 | 140 | 20 | $2.2M | $1.1M |
| 21 East 26 Street | 10010 | 4 | 4 | $6.7M | $1.0M |
| 15 East 26 Street | 10010 | 69 | 15 | $2.4M | $941K |
| 122 East 25 Street | 10010 | 6 | 6 | $3.7M | $773K |
| 31 West 21 Street | 10010 | 11 | 9 | $4.1M | $763K |
| 39 West 23rd Street | 10010 | 45 | 10 | $1.8M | $656K |
| 1 Lexington Avenue | 10010 | 28 | 14 | $1.3M | $639K |
Tower-by-tower write-ups
Full unit-level analyses for Flatiron, Gramercy & Union Square's best-known buildings:
277 Fifth Avenue →Madison Square Park Tower →212 Fifth Avenue →One Madison →10 Madison Square West →15 Union Square West →121 East 22nd →18 Gramercy Park South →240 Park Avenue South →141 Fifth Avenue →
Questions owners ask
How many Flatiron, Gramercy & Union Square apartments owe the NYC pied-à-terre tax?
On the Department of Finance's July 2026 Supplemental Market Value Roll, the Flatiron, Gramercy & Union Square ZIP codes (10010) contain 3,657 condo and co-op units; 415 of them (11%) have a DOF market value over the $1,000,000 Phase-1 threshold and owe the annual surcharge for any year they are not a primary residence. Their combined maximum annual surcharge is $27.3M.
What is the median DOF market value in Flatiron, Gramercy & Union Square?
The median DOF market value across all valued condo and co-op units in Flatiron, Gramercy & Union Square is $401K. Among units over the $1M surcharge threshold, the median is $1.3M. These are Department of Finance market values from the Notice of Property Value — typically below actual sale prices.
How do I check if my Flatiron, Gramercy & Union Square apartment owes the surcharge?
Submit your address and unit at piedaterretax.nyc for a free emailed report with your unit's official DOF market value (the surcharge base), the surcharge test, and rent-vs-sell options if the tax applies — usually within the hour.
Own in Flatiron, Gramercy & Union Square? Get your exact number.
Free emailed report: your unit's official DOF market value, the surcharge test, and — if you're over the line — what a 12-month lease or a sale would look like. Usually within the hour.
Check My Unit — FreeMethodology. Figures aggregate DOF's Supplemental Market Value Roll (July 2026) for ZIP codes 10010 — ZIP boundaries approximate neighborhood borders, so edge blocks may sit in an adjacent page's totals. Condo, co-op and mixed condo units only; 1–3-family houses are excluded here and covered in the database at ZIP level. "Max annual surcharge" assumes no unit qualifies for an exemption; actual collections will be lower. Educational information, not tax or legal advice.