If you want to know why housing in NYC costs what it does, you have to know about a 51 year old law nobody talks about. SEQR, the State Environmental Quality Review Act, was signed into New York law in 1976. The state’s own data shows it produces almost no meaningful environmental findings, yet it applies to virtually every housing project proposed in NYC, adds approximately $82,000 to the cost of every apartment, and delays projects by 6 months to 2 years. The reform now moving through Albany would exempt many housing projects from the SEQR review process. Under the deal expected to be included in the final state budget, NYC housing projects of up to 250 units in low density zoning districts and up to 500 units in medium to high density districts would no longer require SEQR review.
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What This Means for Staten Island Homeowners
The 51-year-old NY law in question is the J-51 / 421-a successor framework — the bundle of tax abatement and rent-regulation overlays that adds an estimated $82,000 to the cost of building each NYC apartment. When that cost gets gutted, multifamily construction economics shift, and the supply-side picture for the entire NYC metro changes. For Staten Island homeowners, the question is whether more multifamily supply borough-wide pressures rents and whether that, in turn, changes the math on building an ADU or holding a small multi-unit on your property.
How Construction Cost Changes Reach Homeowners
Strip $82,000 per unit out of NYC apartment construction and developers pencil out projects that didn’t work before. More projects mean more rental supply over the next 18-36 months. More supply, all else equal, softens rent growth. If you’re a Staten Island homeowner who has been weighing an ADU build to capture rental income, the long-run rent forecast matters. Today’s market shows SI Mid-Island 2BR ADU rents in the $2,000-$2,200 range. If borough-wide rent growth slows from the 5-6% annual pace of 2024-2025 to flat or 2%, the ROI math on a new ADU stretches by a year or two.
The ADU Decision: Build Now or Wait?
The case for building now: the Plus One ADU Program offers up to $395K in forgivable financing for qualifying homeowners, construction costs have been climbing 4-6% per year, and current rent comps are strong. The case for waiting: if more supply hits the market, near-term rent appreciation could slow. My read for 2026: build now if your specific numbers work today at conservative rent assumptions. Run your scenario in the ADU Income Calculator with rents 5-10% below current comps and see if it still pencils. If it does, supply changes downstream don’t matter as much.
What Sellers of 2-4 Family Properties Should Do
Two-to-four-family homes on Staten Island have outperformed single-family in 2025-2026 because investor demand was strong. If multifamily construction picks up borough-wide, that investor competition narrows. Sellers of small multifamily — particularly North Shore and Mid-Island — should not assume the bidding-war environment of late 2025 carries into late 2026. If you’ve been waiting to list, the next 6 months may be a stronger window than the back half of the year.
Got a 2-4 family on Staten Island and wondering what it’s worth right now? I run real comps and a real listing strategy specific to multifamily. Let’s talk. Joseph Ranola, Bridge and Boro Real Estate Team. (917) 905-2541.
