NYC Affordability

HDFC co-ops originated from a city program that transferred city-owned buildings — many taken through tax foreclosure in the 1970s-80s — to resident-formed co-op corporations, in exchange for keeping the building permanently income-restricted. That history is why HDFC apartments routinely sell far below comparable market-rate co-ops in the same neighborhood: buyer income is capped, typically up to around 165% of Area Median Income (AMI) depending on the building’s specific certificate of incorporation, verified against two years of tax returns as part of board approval.

The tradeoff shows up at resale. Where a typical market-rate co-op charges a 1-3% flip tax, HDFC buildings commonly charge 20-30% — sometimes calculated on the seller’s profit, sometimes on the full sale price — specifically to keep prices from drifting toward market rate as units turn over.

Worked example

A 2-person household’s FY2026 100% AMI figure is $110,850 (see the AMI table); at a 165% cap, that household could qualify up to roughly $182,900 in income. On resale, a unit bought for $300,000 and sold for $500,000 has $200,000 in profit — at a 30%-of-profit flip tax, the seller owes $60,000 at closing, on top of any other closing costs. Check a specific building’s actual income cap and flip tax formula in its offering plan or house rules before assuming these figures apply.