40 West 84th Street

The building is classic Upper West Side pre-war: a nine-story masonry facade with the even fenestration, solid proportions, and detail of a 1917 apartment house built to last. Its signature interior trait is the three-apartments-per-floor layout — a low-density plan that yields homes with multiple exposures, good light, and the high ceilings and wide paneled windows the era is known for.

The 28 cooperative residences range across the building's floors with the gracious room scale of pre-war construction. Because there are only three homes per landing, layouts feel generous rather than carved up, and renovated apartments here pair that pre-war framework with modern kitchens and baths. The building's relatively recent 1986 conversion means its cooperative systems and governance are well established, while the bones remain firmly of 1917.

40 West 84th runs as an efficient, modern-minded small cooperative. A live-in superintendent maintains the building, and a keyless electronic fob entry system handles security — a practical, lower-overhead model than a full-time doorman, which helps keep carrying costs down. The amenity set is genuinely appealing for a building this size: a private landscaped garden with seating areas and a grill, a bicycle room, private storage, and a central laundry room. The garden in particular is an asset few West Side side-street buildings can offer.

On policy, the cooperative is notably flexible. Pets are permitted, pied-à-terre ownership is allowed, and the building permits subletting — a combination that is uncommon and that meaningfully widens the buyer pool. The standard purchase calls for a minimum 20% down payment (financing of up to 80%), and the building carries a flip tax payable at closing. As with any cooperative, the board reviews each purchase application with a full package and interview.

Recent sales

Recent transfers 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. $/sf is measured on the latest sales with reliable square footage (2022): a median $1,388/sf (recorded) across 1 sale. The building has traded as recently as 2023. Median listing discount 0.0% from the last ask.

Sales sourced from NYC Department of Finance recorded transfers (BBL 1-01197-0052). 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 on co-ops is not officially recorded, figures shown are approximate.

This building rewards buyers who value flexibility and light. The three-per-floor layout means good exposures; the policies — pets, pied-à-terre, and subletting all permitted — are among the most accommodating on the West Side, which matters if your plans aren't strictly full-time-owner-occupant. Financing is allowed to the standard 80% (20% down), and a flip tax applies at closing, so build that into your numbers. The private garden, bike room, and storage round out a practical amenity set, and the keyless entry keeps costs efficient in lieu of a doorman. Prepare a full board package; even an accommodating co-op reviews each buyer. Most upside here comes from interior renovation, since the pre-war envelope and the location near Central Park are the durable value.

Lead with flexibility and lifestyle. Few West Side co-ops can advertise pets, pied-à-terre ownership, and subletting all in one building, plus a private landscaped garden — that combination broadens the buyer pool well beyond the typical full-time-resident audience and is a genuine differentiator. Pair it with the pre-war fundamentals: three homes per floor, high ceilings, wide windows, and a tree-lined block a short walk from Central Park. Present the apartment's exposures and renovation level clearly, and price against the building's own history and the surrounding pre-war co-ops rather than the Central Park West towers. Plan the board package and interview into the timeline. For the buyer who wants pre-war character with room to use the apartment on their own terms, this building's policies do real marketing work.

If you're considering 40 West 84th Street, also evaluate these nearby Upper West Side co-ops:

• 15 West 84th Street — pre-war cooperative on the same block
• 215 West 84th Street — Upper West Side cooperative nearby
• 15 West 81st Street — pre-war cooperative near the park
• 18 West 87th Street — Upper West Side pre-war cooperative
• 200 West 88th Street — West Side cooperative a few blocks north