310 West 85th Street

Ajello's design gives the building a handsome brick-and-stone street presence in the Romanesque Revival mode, with the masonry detailing and dignified scale typical of the West End/Riverside blocks. The plan is built around four apartments per floor — with one apartment reserved for the live-in superintendent — yielding a small, low-density community.

There are two principal layouts: a four-room, one-and-a-half-bath home, and a larger five-room residence convertible to three bedrooms with three baths. Most apartments retain their period charm — the proportions, light, and detail of 1920s construction — while having been updated to accommodate modern living. The result is a building of real pre-war character that lives comfortably today.

The Mimosa runs as a well-kept, owner-occupied cooperative. A live-in superintendent and a live-in resident manager are on staff, and the building carries the practical amenities residents rely on: a refurbished elevator, a bike room, a laundry room, and full-sized storage bins that transfer with the apartments — a genuine convenience that many comparable buildings can't offer. There is no doorman; this is a self-service entry building, which is reflected in its sensible, lower carrying costs.

On board policy, pets are welcome — a meaningful draw on the dog-friendly Upper West Side. Purchases clear through the customary cooperative board application and interview, and buyers should plan for the documentation and reserves a pre-war co-op expects.

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 (2024): a median $1,227/sf (recorded) across 1 sale. The building has traded as recently as 2026. Median listing discount 0.0% from the last ask.

Sales sourced from NYC Department of Finance recorded transfers (BBL 1-01246-0039). 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.

The appeal here is location and value. You are buying a genuine pre-war apartment on a prime West End–to–Riverside block, steps from Riverside Park, in a pet-friendly co-op without a doorman. Compare actual maintenance, debt and assessments with full-service buildings; staffing alone does not establish lower total costs. Prepare for the co-op board process and assess a suitable apartment’s documents and terms before committing; establish turnover from recorded sales.

Sellers should lead with the block, the park proximity, the preserved pre-war detail, and the building's practical strengths — pet-friendliness, transferable storage, and sensible maintenance. Those features widen the buyer pool and distinguish a Mimosa apartment from generic West Side inventory. Price against recent trades in comparable West End/Riverside pre-war co-ops, adjusted for floor, light, and renovation level, and present the period character at its best, since that is what this building's buyers are looking for.

If you're weighing The Mimosa, also consider these nearby Upper West Side pre-war cooperatives:

• 302 West 86th Street — pre-war co-op a block north
• 305 West 86th Street — full-service West End building nearby
• 316 West 84th Street — pre-war co-op one block south
• 324 West 83rd Street — pre-war West Side cooperative
• 320 West 86th Street — large West End Avenue co-op