420 Riverside Drive (The Hamilton)

Thirteen stories on a corner lot of roughly 17,500 square feet, with about 138,600 square feet of residential floor area — an average of roughly 1,370 gross square feet per apartment before common-area deductions, which is a generous prewar average and consistent with the deep, room-heavy plans this corridor was built for. The Drive frontage runs about 76 feet with the lot running back roughly 194 feet along West 114th Street, so the building has two long exposures and a corner. West-facing lines carry the Riverside Park and Hudson River outlook that defines the corridor; the West 114th Street elevation faces the low-rise institutional and residential fabric of Morningside Heights.

Unit lines run from studios and one-bedrooms through classic six and seven layouts, with combinations at the upper end. DOB alteration filings across the last two decades show the pattern typical of a well-tenanted prewar co-op that trades slowly: individual kitchen and bath renovations, dumbwaiter removals and sealings, and — in 2026 — a permitted combination of two twelfth-floor apartments. Interiors vary enormously by line and by how recently a shareholder invested. Original detail (high ceilings, plaster work, hardwood floors, decorative mantels in some lines) survives in some apartments and has been renovated out of others. This is a building where condition, not building quality, drives the spread between apartments.

Full-time attended lobby with four doormen, a live-in-scale staff of eight including a superintendent, handyman and two porters, all under the 32BJ contract. Central laundry, basement storage lockers rented to shareholders, and a small gym added in 2020. No garage and no parking. A rooftop telecommunications lease has produced meaningful non-shareholder income — roughly $78,000 to $87,000 a year in the most recent audited years — but the schedule in the audited statements shows that lease stepping down after 2022, and a buyer should confirm whether it was renewed rather than assume the income persists.

Capital work has been substantial and continuous. The audited statements record an exterior restoration program capitalized at roughly $310,700 in 2018, $768,600 in 2019 and $174,000 in 2020; an elevator modernization capitalized at roughly $363,900 in 2018 and $125,100 in 2019; heating and plumbing upgrades; a front-door replacement contracted at about $70,000; and an accessibility project. DOB records line up with that: an eighth-cycle facade repair including brickwork, terra cotta and window lintels was filed in 2017 and signed off, and a facade inspection was filed again in June 2025 under the current cycle.

The funding mechanism is worth understanding. From July 2016 the board ran a 54-month assessment equal to 15 percent of maintenance to pay for the elevator modernization; that assessment ran out at the end of 2020. Separately, the corporation levies an annual capital assessment — approximately $1.30 per share in 2019, $1.37 in 2020 and a budgeted $1.40 in 2021 — and its stated policy is to refund the citywide co-op/condo tax abatement to shareholders at roughly the same time the assessment is charged, so the two substantially offset. Maintenance itself ran approximately $1.96 per share per month effective January 1, 2021. The reserve fund stood at roughly $531,000 at the end of 2020, down from about $619,000 a year earlier as capital work was paid for out of it. The auditors note that the governing documents do not require reserve accumulation and that no reserve study has been done — a common posture in older co-ops and one a buyer's attorney should read directly.

Two documented matters belong on the record. An elevator contractor filed a mechanic's lien of roughly $132,000 in March 2020 and demanded arbitration; the corporation counterclaimed for delay damages, and the matter was settled in February 2021 with no payment due from either side, the lien discharged and the surety bond cancelled. Separately, the corporation has been the subject of an investigation by the New York City Commission on Human Rights arising from a resident complaint about the absence of an accessible ramp or lift. No formal proceeding had been initiated as of the most recent audited statement on file; the corporation reported that it was pursuing installation of a wheelchair lift and/or ramp and negotiating a resolution, and DOB records show an application for a new accessible route filed in November 2020. Buyers should ask the managing agent for the current status of both the accessibility project and the Commission matter.

Flip tax. The lesser of $20 per share or 10 percent of net profit, paid by the seller, with proceeds segregated for capital use. On a modestly appreciated apartment the $20-per-share cap will usually bind; on a long-held apartment sold at a large gain, the cap is a meaningful benefit to the seller relative to a straight percentage-of-price flip tax. Net profit is defined in the proprietary lease and permits deductions — read the definition rather than estimating.

Subletting. Permitted after two years of ownership, one-year terms, renewals and extensions beyond two years at the board's discretion, sublessee interview required, and a sublease fee of 10 percent of annual maintenance to the corporation plus a managing-agent processing fee.

Board approval. The board's Admissions Committee interviews every purchaser and every subtenant. The shareholder handbook on file asks for at least two weeks' lead time and indicates interviews are typically scheduled within a month of a complete package; no move-in is permitted before written board approval. Since 2026, New York City Local Law 58 also governs the clock: a co-op must acknowledge receipt of an application in writing within fifteen days and specify what is missing, and must decide within forty-five days of a complete application, with one permitted extension of up to fourteen days.

Fees. A $500 purchase application fee ($100 for each additional applicant), a refundable move-in deposit of $500, a $500 alteration deposit with contractor insurance verification, and a 4 percent late fee on unpaid maintenance, per the documents on file.

Not documented. Maximum financing, pet rules, pied-à-terre policy, and the board's posture on trusts, LLCs, guarantors and co-purchasers do not appear in the plan amendments, the purchase application or the audited statements we hold. None of these are published. Ask the managing agent in writing before you make an offer, and do not rely on a listing summary for any of them.

Recent sales

Recent transfers at this building, curated by The Roebling Team research desk. Prices are the transfer amounts recorded with the NYC Department of Finance; apartment-level detail is checked against the building’s own file in The Roebling Research Library before publishing.

Market read. $/sf is measured on the latest sales with reliable square footage (2025): a median $1,030/sf across 2 sales. The building has traded as recently as 2026. Median listing discount 2.7% from the last ask — a recurring negotiation gap worth pricing into any offer or listing strategy.

Sales sourced from NYC Department of Finance recorded transfers (BBL 1-01896-0001) and verified listing data. Apartment-level facts (line, condition, asking-price context) curated and cross-verified by The Roebling Team research desk. Not all transactions cross-verify with ACRIS records — sponsor and LLC purchases sometimes record at stipulated values rather than market price; square footage on co-ops is not officially recorded, figures shown are approximate.

The composer Elliott Carter, twice awarded the Pulitzer Prize for Music, lived at 420 Riverside Drive from 1920 to 1945. The residence is recorded in the Landmarks Preservation Commission's own entry for the building in the Morningside Heights Historic District.

Read the historic-district file first. You are buying inside the Morningside Heights Historic District. Ask for the LPC-approved windows master plan, which exists and is on file, and ask whether any other master plans (through-wall air conditioning, storefronts, ironwork) are in place. A renovation budget written without that information is a guess.

Underwrite the assessment, not just the maintenance. The building funds capital work through recurring assessments rather than borrowing. That is a defensible strategy and it is why the underlying mortgage is nearly paid off, but it means your true monthly carry is maintenance plus assessment. Run the True Monthly Carrying Cost Calculator with the assessment included.

Get the financing ceiling in writing. No maximum financing percentage is published in any document on file. Do not assume 80 percent. Confirm it with the managing agent before you sign a contract, and prepare a board package that shows post-closing liquidity as well as income — run the Co-op Board Qualification Calculator first.

Ask about the accessibility project and the 2027 mortgage maturity. Both are documented, both are live, and both are questions the managing agent can answer in a sentence. Your attorney should also request the two most recent audited statements and the current budget rather than relying on the ones we hold.

Know what you are buying into as a sublet. Two-year seasoning, one-year terms, board discretion beyond two years, and a 10 percent-of-maintenance sublease fee mean this is an owner-occupancy house. If your plan depends on renting the apartment out, this is the wrong building.

The flip tax structure is a selling point — explain it. Most buyers assume a percentage-of-price flip tax. Here the seller pays the lesser of $20 per share or 10 percent of net profit, and on a long-held apartment the per-share cap is materially cheaper. Have your attorney model it before you set your net.

Lead with the park block and the district. West-facing park and river lines, high ceilings, and a contributing building in a designated historic district are the arguments that separate this building from the generic Morningside Heights stock. Say them plainly.

Document the capital work. Exterior restoration, elevator modernization, front door, heating and plumbing upgrades — all of it is in the audited statements, and all of it survives attorney diligence. A buyer who sees a completed capital program prices a building differently from one who fears an assessment ahead.

Condition sets the price. Estate and long-held apartments in this building clear when they are priced to the renovation math, not against renovated comparables. Run the Renovation Cost Calculator before you set an ask.

If you're considering 420 Riverside Drive, also evaluate:

• 404 Riverside Drive (The Strathmore) — Schwartz & Gross, 1908–09; the adjacent-block Beaux-Arts co-op in the same historic district
• 390 Riverside Drive — another Gaetan Ajello building on the Drive, in the same district
• 375 Riverside Drive — Ajello again, at Cathedral Parkway; the southern end of the same run
• 370 Riverside Drive — Schwartz & Gross at West 109th Street
• 360 Riverside Drive — the southern anchor of this stretch of the Drive
• The Hendrik Hudson (380 Riverside Drive) — Rouse & Sloan's 1907 landmark at Cathedral Parkway; the corridor's most theatrical building
• 600 West 115th Street — another Ajello building a block east; the Columbia-adjacent alternative off the Drive