21 East 66th Street
21 East 66th Street, New York, NY 10065
- Year built
- 1921
- Type
- Condominium — one of the earliest pre-war Upper East Side condo conversions
- Units
- 19
- Floors
- 12
- Landmark
- Designated
Every recorded sale at this building, 2004–2026
Price-per-square-foot over time, the line- and floor-premium curves, and every recorded sale.
- Median $/sf
- $1,955
- Listing discount
- 9.0%
- Recorded sales
- 19
- On record
- 2004–2026
21 East 66th Street — Chez 66 — is one of the earliest pre-war condominium conversions on the Upper East Side, converted to condominium in 1987. It stands between Madison and Fifth Avenues, steps from Central Park, on a prime block near the museums. Built in 1921, it is a pre-war red-brick building with rope quoins, and its interiors carry the details buyers prize in this tier — roughly 10-foot beamed ceilings, herringbone floors, and wood-burning fireplaces.
The proposition here is pre-war grandeur in a condominium wrapper — a rare combination. The condominium structure gives buyers the ownership flexibility a co-op cannot, while the 1921 architecture, the classic six-, seven-, nine-, and eleven-room layouts, and the Madison/Fifth block deliver the pedigree of the finest pre-war addresses. For a buyer who wants a white-glove pre-war home near Central Park without co-op board constraints, Chez 66 is a distinctive choice.
Building operations
The condominium is white-glove and intentionally low-amenity: a full-time doorman and attended elevator service, with no gym or garage. This is the operating profile of the finest pre-war buildings — service and staffing over amenity clutter — and it keeps the building focused on the residences themselves.
As a condominium, ownership is by deed. Purchases clear a condo application and the board's right of first refusal rather than a full co-op board approval, and the building offers the ownership flexibility condominiums are known for — a genuine rarity in a pre-war Upper East Side building of this caliber. Confirm the current pet policy, any move-in rules, and application specifics at offer stage.
Recent sales
Condominium pricing is read on a price-per-square-foot basis, and 21 East 66th trades as a strong pre-war condominium — average pricing runs roughly $2,648 per square foot, with the building average around $5.3M. Partial-floor two-bedrooms start near $3M, ranging up to roughly $13M for full-floor homes. With only 19 residences and one to two apartments per floor, resale volume is thin and each closing carries weight. When underwriting a purchase or a list price, capture the square footage, the room count, the floor, the exposure, and renovation condition rather than relying on a neighborhood average.
Recent closings 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 |
|---|---|---|---|---|---|
| Dec 11, 2024 | 6E | 2 BR · 2 BA · 1,400 sf | $3,150,000 | $2,250/sf | -1.6% |
| Dec 1, 2023 | 2W | 3 BR · 3 BA · 1,906 sf | $3,100,000 | $1,626/sf | -19.7% |
| Nov 30, 2022 | 3E | 3 BR · 2.5 BA · 1,700 sf | $3,215,363 | $1,891/sf | -1.1% |
| May 20, 2021 | 8E | 3 BR · 1,700 sf | $3,200,000 | $1,882/sf | -8.4% |
| Nov 14, 2019 | 2W | 2 BR · 1,903 sf | $2,952,925 | $1,552/sf | -19.1% |
| Mar 6, 2019 | 5W | 3 BR · 3 BA · 1,906 sf | $4,850,000 | $2,545/sf | -17.8% |
| Nov 27, 2017 | 7 | 3 BR · 4.5 BA · 3,600 sf | $11,250,000 | $3,125/sf | -13.1% |
| Oct 30, 2016 | 4W | 1,902 sf | $2,719,400 | $1,430/sf | off-mkt |
Market read. $/sf is measured on the latest sales with reliable square footage (2024): a median $1,955/sf across 1 sale. The building has traded as recently as 2026. Median listing discount 9.0% 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 1-01381-7504) 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 from recorded condo declarations and offering plans.
What to know if you’re buying
The headline is pre-war grandeur without co-op constraints. You are buying a classic 1921 home — 10-foot beamed ceilings, herringbone floors, wood-burning fireplaces, six to eleven rooms — in a condominium, steps from Central Park on a Madison/Fifth block. Note the white-glove, low-amenity profile: full doorman and attended elevator, but no gym or garage. Review the condominium's financials and reserve, and confirm the layout and room count of your unit. The reasons to buy are the pre-war pedigree, the condominium flexibility, and the location near the park and museums.
What to know if you’re selling
The story is a rare one: one of the earliest pre-war Upper East Side condo conversions, a 1921 building with wood-burning fireplaces and herringbone floors, on a prime Madison/Fifth block near Central Park. Pricing is a unit-specific exercise on a $/sf basis: square footage, room count, floor, light, and condition drive the number more than any block average. We position the pre-war character paired with condominium flexibility, prepare the buyer for the condominium process, and benchmark against the right comparable tier of pre-war Upper East Side condominiums.
Comparable buildings
If you're considering 21 East 66th Street, also look at these nearby Upper East Side buildings:
- 770 Park Avenue — pre-war cooperative nearby
- 733 Park Avenue — pre-war condominium nearby
- 135 East 79th Street — boutique Upper East Side condominium
The Roebling Team at 21 East 66th Street
The Roebling Team at Compass specializes in Manhattan's pre-war condominium and cooperative market. We publish this profile because buyers and sellers of pre-war Upper East Side condominiums deserve building-specific intelligence — the architecture and neighborhood context, the ownership structure, the staffing and amenity reality, and where pricing sits against the right comparable tier.
If you're weighing a purchase or sale at 21 East 66th Street, a 30-minute consultation is the right starting point.
The neighborhood
For the full corridor — architecture, schools, transit, and pricing across Upper East Side — read The Roebling Team Guide to Upper East Side.
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