A $4M or more home in Manhattan is financed with a jumbo mortgage: the 2026 conforming loan limit for New York County is $1,209,750, so no loan at these prices can be sold to Fannie Mae or Freddie Mac. The decisions that shape the purchase are local — whether the home is a co-op or a condo, which sets how the loan is underwritten, and how to plan around a buyer-side tax bill that crosses 2 percent of the price as homes pass $5,000,000.
Why nearly every purchase here is a jumbo loan
Each year the Federal Housing Finance Agency sets the largest mortgage Fannie Mae and Freddie Mac will buy. For 2026 the one-unit limit in New York County is $1,209,750, unchanged from 2025 — a high-cost area, though below the national ceiling of $1,249,125. A representative $6,000,000 purchase still finances $4,800,000 or more after a 20 percent down payment, close to four times the county limit, so there is no conforming version of this loan. Each is underwritten loan by loan: income, liquid assets after closing, credit, and the building itself. How interest-only jumbo mortgages work covers the structure many buyers at this level use — interest only for a set period, the later, larger payment planned from the start — and how lenders qualify you against that later payment.
Co-op or condo: two kinds of ownership, two kinds of financing
Manhattan is a market where the first question about an apartment is what you are buying. In a condominium you buy real property: a deed to the unit. In a cooperative, as the New York State Department of Taxation and Finance defines it, you buy shares in a corporation that owns the building plus a proprietary lease on the apartment — the unit is, in the Department's words, the physical space those shares represent. The distinction decides whose approval you need, what secures the loan, and one of your closing costs.
The board sits between you and the loan. A co-op is governed by a board elected by the shareholders, and a buyer must be approved before a deal can close. Many boards also limit financing: capping the share of the price that may be borrowed, requiring a down payment above what the lender would ask, or expecting substantial assets to remain after closing. The lender's ceiling and the board's are separate tests, and the lower one governs. A buyer who could finance most of a condo price may find a particular co-op allows much less.
The loan is a different instrument. A condo mortgage is a mortgage on real property, recorded like any other. A co-op loan is secured by the shares and the proprietary lease, and the lender underwrites the corporation as well as the borrower — its underlying mortgage, maintenance, reserves, and building finances. Both routes exist at jumbo sizes, but the diligence, timing, and paperwork differ.
One closing cost differs outright. Mortgages on real property recorded in New York City pay a combined city and state mortgage recording tax of 2.05 percent under $500,000 and 2.175 percent on residential loans of $500,000 or more; the lender pays the 0.25 percent special additional tax. On a $4,800,000 condo loan the tax is $104,400, or $92,400 borne by the borrower. Mortgages on individual co-op apartments do not incur it at all, as the NYC Department of Finance states — one place the co-op route is cheaper.
The local costs that change the math
New York stacks several taxes on residential purchases at closing, and at $4,000,000 and above the buyer's share is graduated by price. Two of them are paid by the buyer in every deal, for a condo or a co-op alike.
The mansion tax — the state's additional tax — is 1 percent of the price on any conveyance of residential real property, which expressly covers condominium units and co-op apartments, once consideration reaches $1,000,000.
The New York City supplemental tax applies to residential property in the city at $2,000,000 or more, on a graduated scale: 0.25 percent from $2,000,000; 0.5 percent from $3,000,000; 1.25 percent from $5,000,000; 2.25 percent from $10,000,000; 2.5 percent from $15,000,000; 2.75 percent from $20,000,000; and 2.9 percent at $25,000,000 or more. Each rate applies to the full price. Added to the mansion tax, the combined buyer rate reaches 3.9 percent at the top of the scale. On the representative $6,000,000 apartment the two taxes total $195,000: $60,000 of mansion tax plus $135,000 of supplemental tax at the 2.25 percent bracket covering $5,000,000 to just under $10,000,000.
The seller's side carries the state's base transfer tax of 0.4 percent — plus, for city residential conveyances of $3,000,000 or more, an additional base tax of 0.25 percent — and the city's Real Property Transfer Tax of 1 percent up to $500,000 and 1.425 percent above it. In a resale those sit with the seller. In new development the seller is a sponsor, and the contract customarily shifts those taxes to the buyer — one reason closing costs on a new condo run well above those on a resale co-op. Financing a condo or townhouse adds the recording tax above; paying cash avoids it, along with the interest, at the cost of everything paying cash versus financing lays out.
How Manhattan buyers actually finance
At this level, buyers tend to sort into three patterns. Some pay cash outright, trading liquidity for simplicity. Some take a conventional jumbo with 20 to 40 percent down and manage the payment from income. Some borrow against a portfolio instead of the house — a securities-based line whose rate floats and whose lender can call for more collateral when values fall; buy, borrow, die and where the home fits covers that route. What the patterns share is that the building and the taxes are settled first, and the financing is fitted around them.
Where the program fits
The Family Office Mortgage is built for a household buying a home of $4M or more, with assets of $5M or more not counting the home and income of $500,000 or more, that intends to keep the home well past the fifteenth year. It commits about half the purchase price up front: roughly 20 percent as the down payment and up to 30 percent as the contribution to a structured financial product. On a $6,000,000 Manhattan home that is $3,000,000 at closing — $1,200,000 down and $1,800,000 into the instrument — with the mortgage made by a third-party lender. The program is not a lender, a bank, or a government program, and the lender qualifies the borrower in the usual way.
The mortgage is interest only for fifteen years, then principal and interest for fifteen more. At an assumed 6.5 percent — an assumption for illustration, not a rate offer — the interest-only payment on a $4,800,000 loan is $26,000 a month, rising to $41,813 when amortization begins in year 16. The financial instrument's projected payout is sized to that later payment; it is projected, not guaranteed, and the mortgage runs its full thirty years. What a Family Office Mortgage is sets out the structure, and the comparison shows the full path beside a conventional loan.
In Manhattan the structure meets one more gate: the building. For a condo it proceeds as any jumbo would. For a co-op, the board's financing caps and approval come first — the instrument is a personal financial arrangement, but the loan still has to fit the building's rules and the board still must approve the buyer. Where a board limits financing, the program's half-up-front shape can fit comfortably; where a building expects nearly all cash, no financing structure changes that. It suits the long-horizon buyer of a $4,000,000 to $15,000,000 condo or co-op who would rather commit capital than carry a large balance for thirty years, not the buyer seeking maximum leverage on a short hold. The calculator runs the figures on a given price, the program page describes the structure in full, and the eligibility page lists the published criteria.
