A home of $4M or more in Georgetown is financed in 2026 almost always with a jumbo mortgage, because the 2026 conforming loan limit for the District of Columbia is $1,249,125, a fraction of what these homes sell for. Buyers here bring far more than a standard down payment: many pay cash or close to it, and those who borrow arrange the loan around capital they would rather not sell. One structure built for that position is The Family Office Mortgage, a privately offered program that pairs a jumbo mortgage with a structured financial product for households buying a home of $4M or more.
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 may buy. For 2026 the limit is $832,750 for a one-unit home in most of the country and up to $1,249,125 in high-cost areas — 150 percent of the baseline and the highest value the statute allows. The FHFA's published county list places the District of Columbia at that ceiling.
The arithmetic leaves no middle ground. A buyer financing 80 percent of a $4,500,000 price — the standard jumbo structure — takes a $3,600,000 loan, nearly three times the limit. From around $4,000,000 for the neighborhood's smaller row houses to eight figures for the larger houses near Dumbarton Oaks, every financed purchase here is a jumbo, most of them several multiples of the limit — the range lenders informally call super-jumbo.
The housing stock shapes the financing: two-century-old row houses, Federal and Victorian houses, and newer infill, in a neighborhood whose buyer pool draws on law, finance, diplomacy, the university and politics. Inventory in the historic blocks is thin, and the larger houses change hands infrequently. Because a jumbo cannot be sold to the government-sponsored enterprises, each lender keeps the loan or places it privately and writes its own terms — down payment, reserves, rate structure. How an interest-only jumbo mortgage works covers that loan in detail.
How buyers here actually finance
Three patterns recur.
Cash or near-cash. A cash offer removes the lender from the negotiation, and in a thin market sellers value the certainty. The cost is liquidity: once several million dollars are in the house, they come back only through a sale or a new loan, and raising the cash by selling appreciated assets creates a capital gains tax bill that never appears on the closing statement. Paying cash versus financing works through that trade.
A jumbo sized to a large down payment. Buyers who could pay cash often borrow anyway, at 40 or 50 percent down, cutting the interest cost and keeping capital working. Lenders in this range underwrite the whole household: documented income, the assets that remain after closing, and sometimes pledged assets accepted in place of liquidated ones.
Borrowing against a portfolio. Rather than sell positions, a buyer draws on a securities-based line or pledges investment assets to the lender. The portfolio stays intact and the tax event is deferred; what is added is a variable-rate debt against marketable securities, on which a market decline can bring a maintenance call. Buy, borrow, die and where the home fits describes that route and its risks.
Within these, interest-only terms are common at this level: pay only the interest for a fixed period and decide deliberately what repays the principal.
The local costs that change the math
Property tax. The District assesses residential property at 100 percent of market value and taxes Class 1 residential property at $0.85 per $100 of assessed value, per the Chief Financial Officer's published rate schedule. At a $4,500,000 assessment that is $38,250 a year. The District reassesses every year; once the homestead deduction is in place, the assessment cap limits the annual increase in the amount on which the home is taxed to 10 percent.
The homestead deduction. The homestead deduction lowers the assessed value of an owner-occupied principal residence by $91,950 for tax year 2026, a saving of about $782 a year at the Class 1 rate, per the Office of Tax and Revenue. It requires an application; filed by March 31 it applies to the full tax year. Against a $38,250 bill it is modest, but it also unlocks the assessment cap.
Recordation and transfer taxes. The District charges two separate taxes when a deed records. For residential property, the deed recordation tax (D.C. Code § 42-1103) and the deed transfer tax (§ 47-903) each run 1.1 percent of consideration below $400,000 and 1.45 percent on the entire amount at or above it — a combined 2.9 percent at this price. On a $4,500,000 sale that is $65,250 per tax. Customarily the buyer pays the recordation tax and the seller the transfer tax, with the allocation stated in the contract. A higher 2.5 percent bracket that applied to residential transfers of $2,000,000 or more expired September 30, 2023; today it applies only to Class 2 commercial property, not to homes.
A recordation tax on the mortgage itself. The District also taxes the recorded deed of trust at the same 1.45 percent of the debt secured — $52,200 on a $3,600,000 loan, paid at closing on top of the deed recordation tax. A cash buyer avoids it; a financed buyer should budget for it.
The historic district. Most of Georgetown sits in the Georgetown Historic District, designated under the Old Georgetown Act of 1950, among the oldest historic protections in the country — a distinction it shares with Manhattan's landmarked blocks. Exterior work visible from the public streets is reviewed before a permit issues, so street-facing renovations take longer and can cost more than the same work elsewhere — a fact that shapes the renovation budget more than the financing.
The deduction limit. Federal law caps the home mortgage interest deduction at interest on the first $750,000 of debt, or $375,000 if married filing separately, for loans taken out after December 15, 2017, per IRS Publication 936. On a loan of several million dollars the deduction reaches only a small share of the interest. Your CPA can state the after-tax cost for your case.
Where the program fits
The program is candid about where it belongs in this market. It suits a household buying a home of $4M or more, holding $5M or more in assets beyond the home and earning $500,000 or more, that intends to keep the home and would rather commit capital up front than borrow the maximum. It is a poor fit for a buyer who needs full liquidity elsewhere or expects to sell within a few years.
On a $4,500,000 home at the program's standard terms, the household commits half the price at closing: $900,000 as the down payment and $1,350,000 as the contribution to the financial instrument. The mortgage — made by a third-party lender, because the program is not a lender, bank, insurance company or government program — is $3,600,000, interest only for the first fifteen years and principal and interest for the fifteen after. The rate is an assumption for illustration, not a rate offer: at an assumed 6.5 percent the interest-only payment is $19,500 a month, and in years 16 to 30 the scheduled payment is $31,360 a month. The financial instrument's projected payout is sized to that payment. The payout is a projection, not a guarantee; the mortgage still runs its full thirty years; designs are tested with no growth credited in their first two years, and the instrument's values are reviewed against the plan every year.
The trade is deliberate: $2,250,000 committed at closing, in exchange for fifteen years of the lower payment and a designed source for the later ones. The team behind the program has done hundreds of transactions. Whether the structure beats paying cash or taking a plain jumbo depends on the household, which is what the comparison and the calculator are for. The eligibility page states the criteria in full.
