200 East 90th Street (Whitney House)

Twenty-eight stories, roughly 192,000 gross square feet on a 16,578-square-foot corner lot, with about 6,800 square feet of ground-floor retail on Third Avenue and a garage below. The tower is set back from both streets behind planted plazas, which is why the lower floors get more light and less street noise than a lot-line building of the same age.

The offering plan describes 214 residential apartments in the building at conversion. The audited financial statements record 166 today. Between those two numbers sits three decades of combinations, and it shows in the current stock: lettered lines that pair (14BC, 21BC, 27EF, 8FG, 19GH appear in the recorded transfer history) alongside intact single-letter units. Buyers should expect the mix to run from studios and one-bedrooms in the original lines up to genuinely large combined apartments, and should expect layouts within the same letter to differ by floor depending on what was joined.

Because units combined privately over decades rather than as a developer program, alteration history is unit-specific. Ask for the alteration agreements and the sign-offs.

Whitney House is described in listing after listing as a condop. It is not one, and the distinction matters enough to lead with.

A true condop is a building divided by a recorded condominium declaration into separate condominium units — typically one residential and one commercial — where the residential condominium unit is owned by a cooperative housing corporation. The shareholders own shares in the co-op; the co-op owns a condominium unit; the commercial unit is owned by someone else entirely. That structure has visible fingerprints: a declaration recorded in ACRIS, condominium unit tax lots in the 1001-and-up range, and a condominium number in city property records.

None of those fingerprints exist here. We checked:

• No condominium declaration is recorded against block 1535, lot 3 in ACRIS. The recorded instrument history on the lot runs deeds, mortgages, leases and agreements — no declaration.
• No condominium unit lots exist on the block. Lot 3 is a single, undivided tax lot.
• No condominium number appears in the city's land-use record for the lot; the building class is D4, an elevator cooperative.
• The offering plan on file is a cooperative conversion plan. It offers shares in an "Apartment Corporation" under subscription agreements, with a proprietary lease. The word condominium appears in the document only in boilerplate about assessment methodology and sponsor disclosure. There is no condominium regime.
• Every apartment transfer since 2004 is recorded as an SP — a single residential cooperative unit. More than 170 of them, across many different apartment numbers, to unrelated buyers.

What the market means when it says "condop" here is a policy observation, not a structural one: this cooperative's proprietary lease and by-laws, as described in the offering plan on file, do not require the consent of the Board of Directors for a transfer of shares, an assignment of the lease, or a sublet. There is no board interview. That is genuinely unusual, and it is genuinely valuable. But it is a feature of the governing documents of an ordinary cooperative corporation, not evidence of a condominium wrapper.

The practical consequences of getting this right: your closing is a share transfer, not a deed. Your lender writes a co-op loan with a recognition agreement, not a mortgage on real property. Your transfer taxes and your title work follow co-op mechanics. Your monthly is maintenance — which includes your share of the building's real estate taxes and its underlying mortgage — not common charges plus a separate tax bill. And your interest is personal property, with the tax treatment that follows.

One further caution, and it is not hypothetical: board practice can change even where the governing documents are permissive, and amendments to the plan have been filed over the years. Confirm current transfer requirements with the managing agent before you rely on the absence of an approval process.

Full-service, with union staff covered by a Local 32BJ collective bargaining agreement. Amenities are the ones a 1980 avenue tower was built with: doorman, circular drive, planted roof deck, storage, bike room, laundry, and garage access from the basement.

From the audited financial statements for the years ended December 31, 2023 and 2022:

• First mortgage: obtained in 2015 from an institutional life-insurance lender, fixed at 3.77 percent, maturing May 1, 2045, with a balance of $7,932,710 at year-end 2023. This is a genuinely long-dated, low-rate underlying mortgage — a real asset in the current environment.
• Second mortgage: an advance under the same facility taken in July 2023 in the amount of $3,500,000 at 5.92 percent, also maturing May 1, 2045, drawn to fund capital projects. Three further advances of not less than $1,000,000 each may be requested through April 2044, at the lender's discretion.
• Capital assessments: $0.51 per share per month from January 2021 through February 2022; $1.00 per share from March through December 2022; $1.25 per share per month for 2023 and again for 2024, approximately $847,000 a year. A buyer should assume a live capital assessment and ask what the current one is.
• Capital program: a roof replacement contracted in 2021 at approximately $885,000; a Local Law 11 façade rehabilitation estimated at approximately $1,524,000 in contract plus about $190,000 in professional and other costs, substantially complete as of the 2023 audit; an elevator modernization contracted in May 2023 at $1,125,000; and garage repairs the board estimated at approximately $1,000,000, anticipated for 2024.
• The garage has been closed for repairs since March 2023, and the audit flags that the closure may cost the corporation income under the garage lease. Ask whether it has reopened and what the lease consequence was.
• Commercial income: the street-level commercial lease expires December 12, 2026 at minimum annual rent of approximately $167,500, with two five-year extension options at 10 percent increases; the audit assumes renewal through 2036. The garage lease expires June 30, 2030, at roughly $350,000 rising toward $385,000 a year.
• Expense concentration: real estate taxes were 53.3 percent of operating expenses in 2023 — the dominant line, as it is in most Upper East Side co-ops of this vintage without a tax benefit.
• Reserves: cash and equivalents of $2,186,210 plus $4,642,701 in Treasury bills at December 31, 2023.
• The corporation has not commissioned a reserve study, and its governing documents do not require reserve accumulation.

Read as a whole: a conservatively financed building — 3.77 percent locked to 2045 is about as good as a co-op underlying mortgage gets — that has been working through a heavy capital cycle (roof, façade, elevators, garage) funded by a $3.5 million advance and a standing $1.25-per-share capital assessment.

The lot carried a J-51 benefit initiated in 2000 — a 90 percent abatement against qualifying alteration costs of $40,600, with a 14-year exemption term. Department of Finance records show the abatement exhausted by tax year 2011, and the exemption term running from 2000. Nothing remains. There is no J-51 benefit burning off underneath a purchase here, and no step-up in taxes to model on that account.

The only benefit flowing through is the standard Co-op/Condo Property Tax Abatement, which the corporation collects and credits to eligible shareholders — approximately $346,000 in 2023 and $372,000 in 2022. Eligibility is unit-specific and depends on primary residence, so a pied-à-terre or a sublet unit will not receive it. In a building with liberal subletting, that is a real line item to check on the specific apartment.

• Board approval / interview: not required for share transfers, lease assignments or sublets, per the offering plan on file. Confirm current practice with the managing agent — this is the building's headline feature and the one most worth verifying in writing.
• Financing: reported at up to 80 percent in current listing and management-sourced records. Not fixed in the plan.
• Post-closing liquidity: no requirement is published, and in a building without board consent there is no board underwriting to impose one. Your lender's requirement is the operative one.
• Subletting: minimum one-year term; thirty days' written notice; two months' maintenance posted as a security deposit with the managing agent; assignor or sublessor pays a fee fixed by the board.
• Flip tax: set by board resolution rather than by the plan. Get the current figure and who pays it, in writing, before contract.
• Pied-à-terre, trusts and entity purchases: the plan's permissive transfer language and the building's market reputation both point toward flexibility, but we have not located a written policy on trust or LLC ownership. Have your attorney confirm it with the managing agent rather than assuming.
• Pets: the original house rules in the plan require the lessor's express written permission, revocable. Current market records describe the building as pet-friendly. This is exactly the kind of provision where practice has moved and the document has not — confirm the current rule.

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 $982/sf across 3 sales. The building has traded as recently as 2026. Median listing discount 1.8% 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 1-01535-0003) 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.

Say the tenure correctly, and make your lender say it correctly. You are buying shares in a cooperative corporation with a proprietary lease. Not a condominium unit, not a condominium unit held by a co-op. A lender or attorney who has been told "condop" will structure the file wrong. Correct it on day one.

Verify the no-board-approval feature in writing. It comes from the governing documents described in the offering plan on file. It is the reason many buyers are here. Have your attorney obtain written confirmation of current transfer requirements from the managing agent — do not rely on the listing.

Underwrite the capital cycle, not the mortgage. The underlying mortgage is excellent: 3.77 percent to 2045. The live question is capital. A $1.25-per-share monthly capital assessment, a $1.125 million elevator modernization, roughly $1 million of garage repairs, and a garage that has been closed since March 2023 with a lease consequence attached. Ask what has been completed, what the assessment is now, and whether the garage is open.

Watch the December 2026 commercial lease expiry. The street-level commercial lease runs out at the end of 2026 with renewal options the audit assumes will be exercised. Commercial income is a modest but real offset in a building where taxes are more than half of operating expenses.

Check the abatement on the specific apartment. The co-op/condo abatement is primary-residence based. If you are buying to sublet or as a second home, do not underwrite a monthly that assumes it.

Confirm the unit count math. The plan offered 213 apartments; the audit reports 166; PLUTO says 179. If the apartment you are buying is a combination, get its alteration history and its sign-offs.

Market the structure accurately and it becomes an advantage. "No board approval, no interview, subletting permitted, share ownership" is a stronger and more defensible pitch than "condop," which invites a correction from the buyer's attorney at exactly the wrong moment.

Have the documents ready. The offering plan, the current financials, the current assessment schedule and a written statement of the flip tax. In a building with no board process, the buyer's diligence lands entirely on the documents, and a seller who supplies them fast controls the timeline. We provide them from the Research Library to serious buyers' counsel.

Lead with the underlying mortgage. A 3.77 percent underlying loan fixed to 2045 is a genuine selling point in this rate environment, and most buyers will not find it unless you point at it.

Be straight about the assessment. It has been in place since 2021 and stepped up twice. Present it with the capital work it paid for — roof, façade, elevators, garage — and it reads as stewardship rather than as a surprise.

If you're considering Whitney House, also evaluate:

• 120 East 90th Street — Trafalgar House; a 1962 rental converted to condominium in 1984, one block west. The closest alternative for a buyer who wants deed ownership in the same micro-market
• 114 East 90th Street — a 1925 co-op converted from rental in 1979; the pre-war, conventional-board alternative on the same block
• 1280 Third Avenue — a 1966 avenue co-op; the closest like-for-like in vintage and avenue position
• 1150 Third Avenue — a 1960 co-op converted in 1969, with ground-floor commercial; comparable economics
• 120 East 87th Street — Park Avenue Court; the large full-service condominium alternative three blocks south
• 45 East 89th Street — a 1969 Carnegie Hill tower; the scale comparison one block south
• 126 East 86th Street — ARLOPARC; the new-construction condominium alternative on the 86th Street spine
• 200 East End Avenue — the post-war full-service co-op alternative in the quieter East End corridor
• 1725 York Avenue — the Yorkville tower comparison for buyers weighing flexibility against location