Conversion Hope is Fading: New York's Supply Problem is Deteriorating
Developers are pulling back on new apartments just as one of the city's favorite fixes, turning empty offices into housing, is starting to look like a dead end.
The pipeline is shrinking, fast
New York's multifamily development pipeline took a sharp step backward in the second quarter. Developers filed plans for just 8,064 new apartments across 172 projects between April and June which is a 52% drop from Q1, and less than half the 17,500 units per month the city says it needs to close its housing shortage.
Worse, the projects that are getting filed are shrinking too. Just nine of the 172 proposed buildings included 100 or more units; the remaining 153 stayed capped at 99, a threshold that lets developers dodge the higher wage requirements tied to the city's 485-x tax incentive. Total proposed square footage fell 56% quarter-over-quarter to 9.2 million square feet, and multifamily made up 89% of even that reduced figure.
421-a's 2022 expiration removed the incentive that once made large-scale projects pencil, and 485-x hasn't filled the gap. Remaining 421-a-vested sites are scarce, and 485-x's cost structure punishes scale. This pullback is landing while citywide vacancy sits at just 1.4% and median Manhattan rent topped $5,000 in July. Fewer big projects in the pipeline means less relief, not more, for a market that's already this tight.
The conversion thesis was supposed to be the release valve
For the past few years, the standing counter-argument to "developers won't build big" has been office-to-residential conversion: with hybrid work leaving swaths of aging office space underused, the theory goes, that inventory becomes a natural, incentive-light source of new housing supply, sidestepping the land-cost and tax problems dogging ground-up multifamily.
This week's Brooklyn office data is the strongest evidence yet that this thesis is running out of runway. Brooklyn's office availability rate fell 320 basis points year-over-year to 17.2% reaching its tightest level in nearly a decade with net absorption reaching 673,000 square feet. Q2 leasing more than doubled from Q1 to 379,000 square feet, a 61% jump over the five-year average.
Landlords are backfilling space faster than expected, and some of the borough's most conversion-eligible buildings are getting leased up instead of emptied out.
If even a secondary office market like Brooklyn is tightening this quickly, the pool of "obviously obsolete" office buildings that conversion advocates were counting on for future housing supply is smaller and shrinking faster than the narrative assumed.
That doesn't mean conversion is dead everywhere; Manhattan still has plenty of underperforming stock. But the Brooklyn data undercuts the broader assumption that office demand will simply keep receding and hand landlords no choice but to convert. Owners of leasable buildings are choosing to lease, not convert a rational response to demand, but a problem for anyone counting on those buildings to become the next wave of apartments.
Meanwhile, demand for space in NYC is only getting stronger
If there was ever a case that New York's commercial real estate is cooling off enough to free up supply for housing, this summer argued the opposite. A Knicks championship, the nation's 250th anniversary, and the World Cup combined to push retail foot traffic and spending well above typical seasonal levels: the Knicks' playoff run alone generated an estimated $202 million from home games, Fifth Avenue foot traffic between 50th and 59th Streets more than doubled during the first World Cup weekend, and the first five World Cup group-stage matches at MetLife generated $1.2 billion in direct visitor spending. New York also just overtook San Francisco as the top U.S. tech talent market, with AI-driven job growth adding fresh office demand across innovation hubs.
Put together, the story isn't "New York has too much commercial space and not enough housing demand to worry about." It's the opposite: retail, office and residential are all pulling on the same limited pool of land and buildings at the same time, and none of the traditional release valves; neither ground-up development nor office conversion is opening up fast enough to relieve it.
New York's apartment deliveries are shifting across the metro, with Jersey City/Hoboken leading in 2026 before Manhattan is set to account for roughly one-third of new supply in 2027. Keeping the market's outlook strong amid tight vacancy, even as the pipeline behind that wave thins out.
THE TAKEAWAY
The city's housing math increasingly depends on two things: developers building big again, or landlords converting offices they can't lease. This week's data suggests neither is happening. Multifamily filings are shrinking and skewing small to dodge 485-x, while Brooklyn's tightening office market shows landlords finding tenants rather than surrendering buildings to conversion. Unless Albany or City Hall meaningfully rewrites the incentive math, expect continued upward pressure on rents citywide — and increasingly, that pressure won't be limited to Manhattan.