NYC’s Expiring Property Tax Breaks Are Creating a Cost Cliff for Thousands of Buildings

Up to 4,800 city buildings lose their breaks by 2030, and the hit already shows in sale prices.

September 24, 2026

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Good morning. Up to 4,800 city buildings lose their breaks by 2030, and the hit already shows in sale prices.

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Market Snapshot

Most Active Neighborhood

By Deal Count

Bedford-Stuyvesant — 10 sales

Properties Sold

All Asset Types

141

Transaction Volume

Sales Activity

$698.8M

Top Office Submarket

Avg Starting Rent

Hudson Yards

$158.50 / SF

Manhattan Office Rent

Avg Effective

$83.69 / SF

Office Rent Growth

YoY Change

+17.5%

*Office metrics courtesy of CompStak; data from 4/01/26 to 6/30/26. Sales metrics courtesy of Actovia; NYC properties reported sold during the week of 9/11/26 – 9/17/26.

Full freight

NYC’s Expiring Property Tax Breaks Are Creating a Cost Cliff for Thousands of Buildings

Decades-old property tax abatements are phasing out across the five boroughs, and the bills are landing hard on owners who were told a replacement program would arrive in time. It hasn't.

The scale: The Roebling Index counts up to 4,800 condo, co-op and rental buildings losing their breaks between 2023 and 2030, covering roughly 66,000 units; the Department of Finance counts about 4,100 through 2030 and beyond.

What the jump looks like: Breaks from the pre-2016 program run 10 to 25 years and step down near the end, often 20 percentage points at a time. One Park Slope condo owner's annual bill went from $140 in 2022 to $7,600 this year, with $10,500 projected for 2027.

Rentals carry the most exposure: About 2,630 rental buildings are phasing out by 2030, and as many as 40,700 units could lose rent-stabilization status, though deregulation depends on lease notices and other regulatory agreements.

The market already priced it: Across more than 37,000 condo sales, Compass's Corey Cohen found blocks nearing the end of an abatement appreciated 5.4 percentage points less than blocks with years of benefit left.

And the squeeze tightens: Mamdani campaigned on freezing rent-regulated increases, a policy now facing a court challenge, which caps how much of a higher bill owners can pass through. Another 4,600 buildings and 94,000 units become fully taxable between fiscal 2031 and 2040.

➥ THE TAKEAWAY

Underwrite the step-downs: The cost lands somewhere, as higher rents where regulation allows, thinner net operating income, or lower values. Buildings can reapply under the newer program, but it demands added affordability, construction and wage commitments in exchange for the longer runway.

Around New York

➥ Manhattan’s condo pipeline is refilling with 1,000-plus units due by end-2026, after availability hit 2,800 units in August, the thinnest since 2014.

➥ New York has until Sept. 28 to nominate tracts for the permanent Opportunity Zones program, and tighter income tests mean fewer neighborhoods survive the cut.

➥ Trump and Mamdani agreed to keep talking on Sunnyside Yards, the long-stalled plan for 12,000 affordable units decked over an Amtrak yard in Queens.

➥ GFP’s 100 Gold Street conversion grew to 4,000 units, with 1,000 affordable, twice what Community Board 1 has produced in the past decade.

➥ Hochul layered new data center rules onto July’s 50-megawatt moratorium, requiring 72-hour incident reports and quarterly risk filings from Jan. 1.

➥ August’s largest office trades were led by SL Green’s roughly $312M sale of 10 East 53rd to Meadow Partners, and 1441 Broadway’s first ownership change since 1981.

Follow the Money

OFFICEMIDTOWN EAST L&L Infinite bought 600 Third Avenue for $245M, about $426 per foot, with a $215M Bain Capital loan covering nearly 88% of the price.

LIFE SCIENCESNEW YORK Lab vacancy hit 32.5% in Q2 even as venture funding more than doubled to $1.9B, leaving capital and leased space badly out of step.

CULTURALCHELSEA The Rubin Museum listed its 52K SF flagship at 140-154 West 17th with JLL, bundled with 46 apartments, to fund a traveling-exhibition model.

RETAILUPPER EAST SIDE Happier Grocery leased 20,500 SF at 210 East 86th for a 2027 opening, filling a long-vacant former movie theater.

EDUCATIONBRONX CUNY paid $200.9M for its Bronx General Post Office condo, buying out a 35-year lease that would have cost roughly $550M in rent.

OFFICEMIDTOWN EAST The 600 Third Avenue tower changed hands 92% leased, having averaged 94% occupancy over two decades and never dipped below 90%.

📈 CHART OF THE WEEK

NYC’s overlooked residential mortgage market holds $70.8B across 27,286 loans, with 5,405 carrying scheduled rate resets and 1,614 already floating, exposing borrowers to higher financing costs as rates remain elevated.