The building by the numbers
| Metric | Value |
|---|---|
| Co-op units on the surcharge roll | 11 |
| Median DOF market value | $1,358,172 |
| Units over the $1M surcharge threshold | 10 (91%) |
| Top unit DOF value | $3,094,986 |
| Building's max annual surcharge, pre-exemption | $643K |
The surcharge tests each unit's DOF market value — the "Market Value" line on the Notice of Property Value — against a $1,000,000 threshold. In 660 Park Avenue, 10 of 11 units (91%) test over the line, each owing a flat 4%–6.5% of its full market value for any year it is not someone's primary residence. Units below the threshold owe nothing under Phase 1 (through June 30, 2028); primary residents and units on qualifying 12-month leases owe nothing at any value.
Sample units from the roll
| Unit | DOF market value | Surcharge if non-primary |
|---|---|---|
| Apt PH | $847,828 | $0 — under threshold |
| Apt 6THFL | $1,234,702 | $49,388 / yr |
| Apt 9THFL | $1,358,172 | $54,327 / yr |
| Apt 12THFL | $1,399,328 | $55,973 / yr |
| Apt 23FL | $3,094,986 | $162,487 / yr |
Frequently asked questions
Does the NYC pied-à-terre tax apply to 660 Park Avenue?
It depends on the unit. On DOF's July 2026 Supplemental Market Value Roll, 660 Park Avenue has 11 co-op units with a median DOF market value of $1,358,172. 10 of 11 units (91%) are over the $1,000,000 DOF market-value threshold and owe the surcharge for any year they are not a primary residence; the rest owe nothing under Phase 1. The surcharge is a flat 4%–6.5% of a unit's full DOF market value once it clears $1,000,000; units below that owe nothing under Phase 1, which runs through June 30, 2028.
How much is the pied-à-terre tax at 660 Park Avenue?
It is charged on a unit's full DOF market value, not the lower assessed value on your regular tax bill. A 660 Park Avenue unit at the building's median DOF market value of $1,358,172 would owe about $54,327 per year in years it is not a primary residence, and the top-valued unit here ($3,094,986) would owe about $162,487. Across every over-threshold unit, the building's combined maximum annual surcharge is $643K.
Which units at 660 Park Avenue owe the pied-à-terre surcharge?
10 of 11 units (91%) are over the $1,000,000 DOF market-value threshold and owe the surcharge for any year they are not a primary residence; the rest owe nothing under Phase 1. The test is on DOF market value — the income-derived "Market Value" figure on the Notice of Property Value — not the lower assessed value. Whether a given unit actually owes in a given year also depends on use: the surcharge applies only when the unit is not someone's primary residence.
How can I avoid the pied-à-terre tax at 660 Park Avenue?
A 660 Park Avenue unit owes nothing in any of three cases: it is occupied more than half the year by you or an immediate family member as a primary residence; it is leased to a tenant on an arm's-length lease of 12 months or more; or it is sold. Conquest can model the lease-versus-sell numbers for your specific unit at no cost.
How do I check my 660 Park Avenue unit's DOF market value and surcharge for free?
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 threshold test, the estimated pied-à-terre surcharge, and rent-vs-sell options if the tax applies — usually within the hour.
What's YOUR unit's 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 — FreeFigures from DOF's Supplemental Market Value Roll (July 2026), the file the surcharge is administered from; the roll is open to correction through December 2026 and this page regenerates when DOF updates it. Unit designations are public record; no ownership information is shown. Educational information, not tax or legal advice.