The 40-second version: every NYC property has an official DOF market value — the "Market Value" line on the Notice of Property Value. It decides whether you owe the new pied-à-terre surcharge (threshold: $1M for condos/co-ops, $5M for houses). You can look it up yourself at nyc.gov, or we'll pull it for you free — with the surcharge math, your co-op's fractional-share value if applicable, and your options, emailed usually within the hour.
Get your number — two free ways
Option 1 — We pull it for you (recommended for co-ops and anyone who wants the full picture)
- Enter your address and unit in the free checker — 30 seconds, no account.
- We look up your property on the official DOF assessment roll — for co-ops, we use DOF's own published unit values (36,677 units across 764 buildings) or the statutory fractional-share method.
- You get an emailed report: your official DOF market value, your assessed value, the surcharge test against the threshold, and — if you're over the line — what a 12-month lease or a sale would look like. Usually within the hour.
Option 2 — Do it yourself at nyc.gov
- Go to DOF's property lookup and search your address.
- Open your latest Notice of Property Value (NOPV) — mailed every January, also available as a PDF there.
- Read the "Market Value" line. That's the number the surcharge tests — not the assessed value below it, and not what you paid.
The self-service route works well for condos and houses. Co-op shareholders often hit a wall: DOF values the building as one lot, and your unit's share depends on the stock ledger — that's exactly the math our free check does for you.
Which number is which
| The number | What it is | What it's used for |
|---|---|---|
| DOF market value | DOF's income-approach valuation — the "Market Value" line on your NOPV | The pied-à-terre surcharge test and base |
| Assessed value | 45% of the market value (class 2) | Your regular property-tax bill — NOT the surcharge |
| Sale / listing price | What the market would pay | Nothing here — usually far above DOF's market value for condos |
Mixing these up is the most common mistake owners make with this tax. A condo that would sell for $1.5M often carries a DOF market value under $1M — meaning no surcharge at all — while some co-op shareholders discover their fractional-share value is higher than they assumed.
Questions owners ask
How do I look up my NYC DOF market value for free?
Two free ways: (1) search your address at nyc.gov/finance's property lookup and read the 'Market Value' line on your latest Notice of Property Value (NOPV); or (2) submit your address at piedaterretax.nyc and receive an emailed report with the official DOF market value, assessed value, and the pied-à-terre surcharge test — usually within the hour. Co-op shareholders should use the second route: DOF values the building as one lot, and the unit-level number requires the fractional-share calculation.
Is the DOF market value the same as my home's sale price?
No. The DOF market value is an income-approach figure that for condos usually sits well below the actual sale price, while the assessed value is 45% of the DOF market value. The pied-à-terre surcharge tests the DOF market value only — a condo that would sell for $1.5M can carry a DOF value under the $1M threshold and owe nothing.
What is the Notice of Property Value (NOPV)?
The statement DOF mails every owner each January showing the property's market value and assessed value for the coming tax year. The 'Market Value' line on the NOPV is the base and threshold test for the non-primary residence surcharge.
Skip the homework — we'll pull it free.
Official DOF market value, assessed value, the surcharge test and your options — emailed, usually within the hour. Condo, co-op or townhouse.
Check My Unit — FreeWhy we do this free
Conquest is a licensed New York brokerage. Owners who learn they're exposed to the surcharge often want the rent-vs-sell math done next — that's our business, and the free lookup is how we earn the conversation. The report itself carries no obligation, and most people who use it owe nothing and simply get peace of mind. Data source: the NYC Department of Finance assessment roll and the July 2026 Supplemental Market Value Roll — see the glossary for every term.
Disclaimer. This page is educational information from Conquest, a licensed New York real estate brokerage. It is not legal, tax, or accounting advice, and no advisory relationship is created by reading it. Deadlines and figures reflect DOF's published rules and roll as of the "last updated" date above.