15 East 91st Street
15 East 91st Street, New York, NY 10128
Carnegie Hill, Upper East Side
BBL 1015030014 · BIN 1047014
- Year built
- 1946
- Type
- Cooperative
- Units
- 43
- Floors
- 16
- Flip tax
- A flip tax applies; confirm the rate at the offer stage.
- Financing
- Up to 50% financeable (50% minimum down).
- Subletting
- Not permitted — an owner-occupancy building.
- Pied-à-terre
- Not permitted.
- Pets
- Permitted, subject to Board approval.
Compiled by The Roebling Research Desk from the building’s offering plan, amendments, and related building documents (primary source dated 2026). Board policies can change by amendment — confirm at the offer stage.
Every recorded sale at this building, 2003–2025
Bedroom-by-bedroom medians, the full transfer record, and how units trade against ask.
- Recent range
- $1.6M – $6.2M
- Listing discount
- 5.6%
- Recorded transfers
- 44
15 East 91st Street is the Schultze & Associates / Columbia School of Architecture postwar cooperative on the Carnegie Hill mansion blockfront — adjacent to the historic Otto Kahn / Convent of the Sacred Heart mansion block and the James Burden / Andrew Carnegie mansions on East 91st Street.
The building's distinction starts with its Columbia School of Architecture collaboration, an academic-design provenance uncommon among postwar Carnegie Hill cooperatives — and it is sited to match that pedigree. The mansion-block adjacency places 15 East 91st among the most architecturally consequential Gilded Age residential blocks in New York, directly beside the Carnegie mansion (now the Cooper-Hewitt Museum) and the Convent of the Sacred Heart (former Otto Kahn mansion). Governing who joins this address is the building's no-subletting policy, a buyer-screening fact of real consequence that materially narrows the investor pool.
Important policy flags: subletting is NOT allowed, the flip tax is 2.5% (higher than the 2% Carnegie Hill standard), and financing is capped at 50% (conservative).
Local Law 97
- 2024–2029 annual penalty
- $0 (under cap)
- 2030–2034 annual penalty
- $84/yr
- Per unit / month range
- $0 – $0
Facade safety — Local Law 11
The latest available filing classified the facade as SWARMP — Safe With A Repair and Maintenance Program: the engineer identified conditions requiring monitoring or repair before the next inspection cycle. The scope, timeline, and how the building funds the work are building-specific — we review the filings and board materials for you.
QEWI = Qualified Exterior Wall Inspector — the licensed engineer the city requires to sign the report (the independent expert, not the managing agent). Source: NYC DOB facade filings (FISP) · The Roebling Research Library.
See the full facade history →Management & transfer contacts
- Flip tax
- 2.5% per share (Buyer) / transfer fee 2.5% of gross purchase price
- Sublet policy
- Not allowed
- Pied-à-terre
- Not allowed
- Notable fees
- App processing $600 ($1,000 trust) +$250/co-applicant; move-in $500; closing $800 ($850 w/o broker)
Recent sales
Recent transfers at this building, curated by The Roebling Team research desk. Apartment-level facts are independently verified before publishing; sale prices reflect the recorded transfer amount at the NYC Department of Finance.
| Date | Unit | Apartment | Price | PPSF | vs. Ask |
|---|---|---|---|---|---|
| Mar 7, 2025 | 5A | 2 BR · 2 BA | $2,100,000 | +0.0% | |
| Jul 26, 2024 | 9C | 1 BR · 1.5 BA | $1,600,000 | -5.6% | |
| Apr 10, 2023 | 9A | 4 BR · 4.5 BA | $6,200,000 | -8.5% | |
| May 24, 2022 | 6A | 2 BR · 2 BA | $1,950,000 | -7.1% | |
| Feb 18, 2022 | 11FLRA | 3 BR · 3.5 BA | $2,699,999 | -8.3% | |
| Feb 17, 2022 | 11A | 3 BR · 3.5 BA · 2,400 sf | $2,780,000 | $1,158/sf | -5.6% |
| Feb 3, 2022 | 3A | 3 BR · 4.5 BA | $3,550,000 | -6.6% | |
| Jan 21, 2022 | 2E | 2 BR · 2.5 BA | $1,750,000 | -5.4% |
Market read. $/sf is measured on the latest sales with reliable square footage (2022): a median $1,191/sf across 1 sale. The building has traded as recently as 2025. Median listing discount 5.6% from the last ask — a recurring negotiation gap worth pricing into any offer or listing strategy.
The retrade record
Lines that have traded more than once in the public record — the building’s appreciation arc, apartment by apartment.
Full closing history with price-per-square-foot over time, the complete retrade record, and every line that has traded.
Sales sourced from NYC Department of Finance recorded transfers (BBL 1-01503-0014) 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.
What to know if you’re buying
The no-subletting policy is structurally significant. Plan primary-residence positioning at the application stage; the policy materially narrows the investor and pied-à-terre buyer pool.
The 2.5% buyer-paid flip tax is higher than the Carnegie Hill 2% standard. On a $3 million purchase, $75,000 of additional buyer cost.
The 50% financing maximum is conservative. Plan for substantial down payment; verify post-closing liquidity expectations at application.
The Schultze & Associates / Columbia School of Architecture pedigree is real institutional context. The academic-design provenance is uncommon among postwar Carnegie Hill cooperatives.
The mansion-block adjacency is among the most architecturally consequential urban contexts in Manhattan. Cooper-Hewitt Museum, Convent of the Sacred Heart, James Burden Mansion all within steps.
The PM management is real institutional infrastructure. Verify board package requirements and pied-à-terre policy directly.
Closing timelines are cooperative-standard. Plan for 6 to 10 weeks from contract through board approval to closing.
Comparable buildings
- 17 East 89th Street — Ajello 1924; nearby Carnegie Hill peer
- 131 East 93rd Street — Braun 1923 neo-Federal; nearby Carnegie Hill peer
- 14 East 90th Street — Carpenter 1928; nearby Carnegie Hill peer
- 47 East 87th Street — 1947 postwar; same-vintage Carnegie Hill peer
- 50 East 89th Street (Park Regis) — Emery Roth & Sons 1974; nearby Carnegie Hill modernist peer
Sources: The Roebling Research Library (offering plans, house rules, financial statements, board minutes, internal transaction records); NYC Department of Finance recorded transfers; publicly recorded NYC building data.
The neighborhood
For the full corridor — architecture, schools, transit, and pricing across Upper East Side — read The Roebling Team Guide to Upper East Side.
The full playbook — what goes in the package, how boards read your financials, the interview, and the timeline — plus sample cover, reference, and personal letters you can adapt.
Considering a move at 15 East 91st Street?
Request a private building brief with the relevant comparable sales, current and off-market availability, and an apartment-specific view of value.
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at 15 East 91st Street would likely sell for today, what it costs to sell, and what you’d walk away with — reviewed personally against condition, exposures, renovation quality, and the competition actually on the market.