1280 Fifth Avenue (One Museum Mile)

Stern's Fifth Avenue elevation curves to follow the park corner, which is the building's one genuinely urbanistic gesture and the reason the park-facing residences get a wider outlook than a flat frontage would give. The materials are conventional for the firm and for the period — masonry with large window openings — and the residential tower reads as a distinct volume sitting on the lower museum block below.

RAMSA describes a 19-story tower — city records also carry 19 stories for the whole building — with the museum at the base, residents' amenities on the fourth floor and apartments above. City records support a count of 111 to 113 residential units; PLUTO carries 112 residential and 135 total, the difference being the museum, commercial and parking units. The 116 figure that circulates in listing records is not supported by any DOB or DOF record and should be treated as marketing arithmetic.

Exposure is the dominant variable in the stack, and it is unusually binary here. West-facing residences look directly over Central Park at its widest and least built-up end, with the North Woods, the Harlem Meer and the Conservatory Garden immediately below. East- and north-facing residences look over Harlem and East Harlem. The premium between them is large, and it widens with floor. Terraces appear on a number of lines and are governed as limited common elements, with plantings and any decoration subject to the residential board's written approval.

One Museum Mile runs as a full-service condominium with a resident manager, an attended lobby, a package room, on-site parking, a 24-hour fitness center, a swimming pool, a children's playroom and a landscaped rooftop terrace with a grill. The house rules on file are specific. Review the current budget, audited statements, debt and any assessments.

The two-section structure is the first diligence item. The Residential Section and the Museum Section share a building. The house rules require residential owners not to interfere with the rights or convenience of the occupants of the Museum Section, which tells you the two sections are close enough for that to matter. Ask for the declaration and by-laws, the cost-allocation methodology between the sections, and the current condition of the museum unit — an institutional tenant in the base is a different kind of neighbor from a retail one, with a different capital profile and a different failure mode.

The house rules carry a graduated fine schedule. A first violation draws a warning, a second and subsequent violations $250, a third $500, and a fourth costs six months of amenity access. Drug-related violations draw an immediate fine with no warning. Pool and terrace violations can be charged at up to $500 per day and are treated as additional common charges.

Leasing runs through the managing agent, without exception. Every lease of a residential unit must be effected through the condominium's managing agent, and leasing outside that process — the house rules name short-term platforms specifically — is prohibited. Investor buyers should understand this before assuming ordinary condominium leasing freedom.

Quiet and construction hours are fixed. No amplified sound between 11:00 p.m. and 7:00 a.m. Renovation and repair work is confined to weekdays, excluding holidays, between 8:00 a.m. and 5:00 p.m. At least 75% of the floor area of each unit, excluding kitchens, pantries, bathrooms, closets and foyers, must be covered in rugs or equivalent sound-attenuating material.

Smoking is prohibited throughout the common areas — lobby, stairwells, corridors, elevators, package and mail room, roof deck, basement and amenity spaces — and within 20 feet of any building entrance or window, terraces included. Smoke may not migrate from a unit into corridors or neighboring units.

Amenity access is a lever. Loss of fitness center and terrace privileges is an enforcement remedy, and the pool is subject to a separate set of rules that can be amended by the residential board.

Ownership form: Condominium, in two sections. LLC, trust and foreign purchase operate under the standard condominium framework; the board's remedy on a sale is a right of first refusal rather than cooperative-style approval. Confirm the current waiver process and turnaround time with the managing agent.

Pets: Permitted for owners and for tenants, subject to the same conditions. Two per unit is the ceiling without board consent. Pet dogs must be leashed at six feet or less, use the 109th Street side entrance when wet or muddy, and are excluded from common spaces under the published rules, which expressly mention registered service dogs. Owners may be required to sign a pet agreement and indemnity. Disability-related requests for service and emotional-support animals are governed by individualized reasonable-accommodation standards; confirm the procedure and appropriate access conditions with management.

Leasing: Permitted, through the managing agent only. Short-term platform rental is prohibited.

Taxes: No 421-a exemption remains on the residential unit lots. Underwrite the current bill for the specific unit, and check any carrying-cost figure drawn from a sale that closed before mid-2022 against it.

Alterations: Board approval required for any heating, ventilation or air conditioning device, for terrace plantings and decoration, and for any exterior-visible change. Work hours are fixed by the house rules.

Recent sales

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.

Market read. Most recent trades (2026 to date) cleared a median $1,301/sf (floor-adjusted) across 2 sales. 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 1.3% 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 1-01615-7501; each condominium apartment is its own tax lot). 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.

Underwrite the unabated tax bill. The 421-a ran from the 2012/13 tax year through 2021/22 and is gone. Pull the current DOF bill on the specific unit and use it in place of any tax figure from the exemption years.

Read the declaration for the two-section structure. The Museum Section is a co-owner of the building, not a tenant. Understand the cost-allocation methodology, the shared systems, and the governance rights of each section before you buy.

Take the leasing restriction seriously if you are an investor. Every lease goes through the managing agent, and short-term rental is prohibited outright.

Buy the park exposure if the budget reaches. The Fifth Avenue elevation at this end of the park is the reason to be in this building. Harlem-facing inventory is a different value proposition and should be priced as one.

Ask about the museum unit's condition and occupancy. An institutional occupant at the base is an asset when it is funded and active, and a question mark when it is not. It is a fair and standard thing to ask.

Read the fine schedule and the house rules before you renovate. Work hours, floor-covering requirements and terrace rules are specific and enforced.

Get ahead of the tax question. Every buyer's attorney will find that the abatement expired. Present the current, unabated monthly figure yourself, with the comparison to what the buyer would pay in a Carnegie Hill co-op at the same monthly cost.

Lead with the park. Present the direct Central Park frontage and 2012-vintage full-service condominium; compare current Fifth Avenue offerings and dated sales before claiming unique availability at a price.

Price by exposure, not by building average. Park-facing and Harlem-facing inventory should carry separate comparable sets.

Explain the address rather than apologize for it. The Fifth Avenue and Museum Mile position is real and documented — the city extended the designation to include this block. That is a fact, not a claim.

Have the two-section documents ready. Buyers' counsel will ask about the museum condominium. A seller with the declaration, the allocation methodology and the current financials in hand keeps the deal moving.

If you're considering One Museum Mile, also evaluate:

• 1270 Fifth Avenue — the immediate Fifth Avenue neighbor to the south
• 1165 Fifth Avenue — prewar Carnegie Hill cooperative on the same corridor, the co-op comparison a buyer should run
• 1158 Fifth Avenue — Carnegie Hill Fifth Avenue cooperative peer
• 1150 Fifth Avenue — Fifth Avenue cooperative a few blocks south
• 1485 Fifth Avenue (5th on the Park) — the newer Harlem condominium on Fifth Avenue north of the park; the direct new-development comparison
• 111 Central Park North — park-fronting Harlem condominium on the north side of the park
• 145 Central Park North — Harlem park-front condominium alternative
• Circa Central Park (285 West 110th Street) — the park-front condominium at the northwest corner, the closest peer on amenity and vintage