404 East 66th Street
404 East 66th Street, New York, NY 10065
Lenox Hill, Upper East Side
BBL 1014607501 · BIN 1083271
- Year built
- 1960
- Type
- Condominium
- Units
- 128
- Floors
- 13
- Landmark
- No
- Pets
- Pet-friendly for resident owners, subject to approval
The Hardenbrook House Condominium sales history: 111 recorded sales
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 (floor-adjusted)
- $891
- Listing discount
- 3.2%
- Recorded sales
- 111
- On record
- 2004–2026
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at The Hardenbrook House Condominium 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.
The Hardenbrook House is a full-service postwar condominium in the far-east reach of Lenox Hill — a 1960 building on the quiet mid-block stretch of East 66th Street between First and York Avenues, close to the East River, the hospital corridor, and the tram and bridge approaches. Condominium ownership is comparatively uncommon in this pocket of the Upper East Side, where postwar inventory skews heavily to cooperatives. That distinction is the building's central value proposition: it offers the flexibility of condo ownership — straightforward financing, permissive subletting, and pied-à-terre use — in a neighborhood where those terms are otherwise scarce.
The appeal is practical rather than architectural. This is a service-forward, amenity-equipped building with an attended garage, a live-in super, and a landscaped courtyard, historically carrying common charges that run lower than many comparable full-service buildings in the immediate area. For buyers who want an owner-occupied home, a pied-à-terre, or an income-producing hold without the constraints of a co-op board, the Hardenbrook House is one of the more usable options east of Second Avenue.
Architecture and building operations
Built in 1960, 404 East 66th Street is a 13-story postwar apartment building of light-brick construction, configured as a full-service condominium under the name The Hardenbrook House Condominium. Reported unit counts vary across public sources between roughly 128 and 158 residences, reflecting differences in how studio, alcove, and combined lines are tallied; the exact number should be confirmed against the offering plan and current schedule at diligence.
Operations are full-service. The building maintains a 24-hour doorman, a live-in superintendent, a valet-attended parking garage, a central laundry room, a bike room, and private storage lockers, along with a shared landscaped courtyard that gives the ground floor an unusual amount of usable outdoor amenity for a mid-block building of this era. The lobby has been renovated in recent years. There is no reported roof deck, gym, or pool; buyers who prioritize those amenities should weigh the building accordingly.
Policy framework
- Type: Condominium — no board approval to purchase; the condominium board holds a right of first refusal
- Pets: Permitted for resident owners, subject to approval; some rental leases restrict pets
- Pied-à-terre: Permitted
- Financing maximum: Condominium financing is generally flexible; confirm any lending guidance with the managing agent at offer stage
- Subletting: Permitted — a meaningful advantage over neighboring cooperatives
- Trust, LLC, foreign buyers: Generally accommodated under condominium ownership; confirm at contract
- Right of first refusal: Standard condominium waiver process applies
Facade safety — Local Law 11
The latest available FISP filing classified the facade as Safe — no repairs were required at that inspection. Facade inspections run on a fixed five-year cycle; future inspection, repair, and any assessment decisions remain building-specific.
How to read this, and where it comes from
QEWI = Qualified Exterior Wall Inspector — the licensed engineer the city requires to sign the report (the independent expert, not the managing agent).
Penalties shown are amounts DOB assessed against filings on record across 2005–10 to 2020–25. The FISP dataset does not record whether they were paid, contested or remain open, so treat the figure as history rather than a current balance and confirm the building’s standing with the managing agent.
Source: NYC DOB facade filings (FISP) · The Roebling Research Library. City record last verified September 2026.
Recent sales
As a condominium, 404 East 66th Street trades on a price-per-square-foot basis rather than the price-per-room framing used for co-ops. Pricing here reflects three durable factors: the far-east Lenox Hill location, which sits at a discount to the Park-and-Fifth blocks; the condominium tenure, which typically commands a premium over comparable co-op stock because of financing and subletting flexibility; and the building's postwar layouts, which favor efficient studio-through-two-bedroom configurations over grand prewar proportions.
Buyers should expect per-square-foot values below the trophy condominium corridor and generally in line with, or modestly above, the full-service co-op inventory nearby — with the condo structure and permissive subletting supporting resale liquidity and investor demand. Specific closed prices move with unit line, floor, light, and condition, and should be underwritten against current recorded transfers rather than headline averages.
Recent closings at this building, from The Roebling Research Library. 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.
| Date | Unit | Apartment | Price | PPSF | vs. Ask |
|---|---|---|---|---|---|
| Mar 16, 2026 | 1G | 1 BR · 1 BA · 877 sf | $770,000 | $878/sf | -3.1% |
| May 21, 2025 | 7C | 500 sf | $620,000 | $1,240/sf | -4.5% |
| Mar 11, 2025 | 2B | 1 BA · 560 sf | $560,000 | $1,000/sf | +0.0% |
| Feb 28, 2025 | 3H | 874 sf | $650,000 | $744/sf | off-mkt |
| Dec 18, 2024 | 2A | 1 BR · 1 BA · 721 sf | $690,000 | $957/sf | -5.3% |
| Oct 21, 2024 | 6H | 1 BR · 1 BA · 875 sf | $795,000 | $909/sf | -11.2% |
| Jun 28, 2024 | 4N | 1 BR · 1 BA · 700 sf | $700,000 | $1,000/sf | -7.9% |
| Jun 26, 2024 | 4E | 2 BR · 2 BA · 1,200 sf | $1,300,000 | $1,083/sf | -13.0% |
Market read. Most recent trades (2026) cleared a median $891/sf (floor-adjusted) across 1 sale. Floor-adjusted means each sale is restated to a constant mix of floors, so the figure can differ from the plain median of the sales listed above. Median listing discount 3.2% 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 1-01460-7501). Apartment-level facts (line, condition, asking-price context) curated and cross-verified in The Roebling Research Library. 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.
Closed rents at The Hardenbrook House Condominium, last 36 months
| Size | Leases | Median / month |
|---|---|---|
| Studio | 6 | $3,250 |
| 1 bedroom | 4 | $4,475 |
11 closed leases, October 2023 to September 2026. Most recent lease August 2026. Sizes with fewer than 2 leases are not shown. Compiled by The Roebling Team at Compass from closed leases.
At the recent median sale of $690K (6 sales since 2024), a buyer putting 25% down would pay about $27,688 to close, or 4.0% of the price.
- Mansion tax: $0
- Mortgage recording tax: $9,962
- Title insurance: $3,105
- Attorneys, lender, building fees, reserves and filings: $14,622
Assumes a resale (the seller pays transfer taxes), a $4,500 attorney fee and a mortgage on the rest.
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What to know if you’re buying
- Condominium tenure is the headline advantage. Financing flexibility, pied-à-terre use, and permissive subletting are rare in this pocket of Lenox Hill and directly support the building's resale and rental utility.
- Amenities are service-forward, not resort-style. Attended garage, live-in super, central laundry, bike room, storage, and a landscaped courtyard — but no roof deck, gym, or pool on record.
- Common charges have historically run lower than many full-service peers; confirm current charges, assessments, and the reserve position in the financials.
- The far-east location is a trade-off. Quiet and residential, close to the river and the hospital corridor, but a longer walk to the Lexington Avenue subway lines than blocks farther west.
- Confirm the unit count and any active assessments against the offering plan and current schedule at diligence, since public sources differ.
What to know if you’re selling
- Lead with the condominium structure. In a co-op–dominated micro-market, financing flexibility and subletting rights are a genuine differentiator worth foregrounding.
- Position the amenity package clearly — attended garage, live-in super, storage, and courtyard — while setting accurate expectations on the absence of a roof deck, gym, or pool.
- Bring current financials to the table. Historically competitive common charges are a selling point when documented against neighboring buildings.
- Pricing should be anchored to recent in-building and immediate-block comparables, with condition and floor/light adjustments, rather than to broader Lenox Hill averages.
Comparable buildings
- 304 East 65th Street (The Rio) — nearby Lenox Hill condominium with full amenity package
- 310 East 70th Street — nearby full-service Lenox Hill cooperative
- 1440 Second Avenue — nearby full-service Lenox Hill cooperative
- 188 East 76th Street — nearby Upper East Side peer
- 1 East 66th Street — same cross-street Upper East Side peer
More Upper East Side buildings
- The Amherst (401 East 74th Street) — 1962 co-op
- 402 East 74th Street — 1937 co-op
- River East Plaza (402 East 90th Street) — condominium
- 404 East 76th Street (The Impala) — 2000 condominium
- 404 East 79th Street (Hampton House) — 1985 condominium
- The York Gate (405 East 63rd Street) — 1958 co-op
The neighborhood
For the full corridor — architecture, transit, and pricing across Upper East Side — read The Roebling Team Guide to Upper East Side.
How to read the facts on this page. Items attributed to an offering plan describe the building as it was offered at that filing — unit mix, square footage, the amenity program as planned. They are not a statement about how the building operates today. Tax and compliance figures are sourced separately to current City records and carry their own dates. House rules, staffing and fee policy can change by board resolution without any public filing: treat every policy line here as a starting point for diligence and confirm it with the managing agent. Where this page compares one building or neighborhood to another, that is our analysis of the recorded record — it names the measure, the period and the sample it rests on, and it is an observation about medians rather than a prediction about any particular apartment.
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