Absolutely not!
If you live in a one- to three-family home in NYC, your real estate taxes are based on the “assessed value” of your property, which is calculated as 6% of its fair market value (based on comparable sales). But this is not the case for co-ops and condos. For these, the “market value” of each building is determined by a formula that has very little to do with actual fair market value.
For smaller buildings (10 units or fewer), the city applies a gross income multiplier based on similar rental buildings. For larger buildings (11 units or more), the city estimates potential income and expenses using comparable rental properties and applies a capitalization rate to determine the market value. An assessed value of 45% is then applied to that figure.
The city uses rental buildings as comps—probably because, historically, nearly all buildings in NYC were rentals before the waves of co-op and condo conversions in the 1980s and beyond. So the methodology stuck.
But it’s far from perfect. For example, a condo in Tribeca in a full-service building might be assigned a market value far below its actual worth because it’s being compared to a walk-up rental—possibly not even in Tribeca! That might be a slight exaggeration, but the flaws in the system are real. It’s entirely plausible that two nearly identical buildings on the same block have different “comparable” rental buildings used by the city for assessment.
This is exactly the case for my building at 15 West 81st Street and the very similar Beresford at 211 Central Park West. Both were built at the same time, by the same architect, with similar layouts and stature. In fact, the apartments in several lines are nearly identical in value—but the tax assessments are not.
Add to this the existence of rent-regulated units, which are still found in many buildings (though fewer than ever). If a building with rent-regulated units is used as a comp, it will show lower net rent due to those units—resulting in a lower assessed value. The city hasn’t yet adjusted for this nuance, though that could change soon.
And to make things even more confusing, there are various tax exemptions—like STAR, senior exemptions, and co-op/condo abatements—that may reduce your actual tax liability.
Once the city sets taxes for a condo, each individual unit owner is billed for their share based on the size of their unit. Co-ops, by contrast, take the total tax amount and divide it among shareholders based on share allocation—then include that amount in the monthly maintenance.
Most large co-ops challenge their assessments every year through tax certiorari filings. However, because NYC relies so heavily on real estate taxes, these challenges are rarely successful (though occasionally, they do prevail)
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There may be some relief on the horizon. Trump has pledged to reinstate the full SALT (State and Local Tax) deduction, which he previously capped at $10,000 under the 2017 Tax Cuts and Jobs Act. That cap hit New Yorkers hard—especially homeowners in high-tax neighborhoods like Manhattan. If the full deduction is restored, high real estate taxes might become more financially manageable for many buyers, since they’d once again be deductible from federal income taxes.