124 East 84th Street

The building rises ten stories in red brick, its formality concentrated at the entrance — a canopy set into a broken-pediment limestone surround, two steps up from the sidewalk — with window reveals articulating the second and top floors. The original architect is not reliably documented in public records, and we decline to guess; the building reads as solid 1920s middle-Gold-Coast fabric, built in the same cycle that filled the Park-to-Lexington side streets with mid-rise apartment houses.

Inside, the roughly 37 apartments distribute at about four per floor — predominantly one- and two-bedrooms with pre-war proportions, plus larger three-bedroom combinations created over the decades (the unit count's drift from 38 in the offering plan to 36 in city records is the combination history made visible). Scale is the building's character: short hallways, few neighbors per landing, and a small number of residences to compare with the landing arrangements of larger avenue co-ops.

The service model is boutique: a doorman attends the lobby from 8 a.m. to midnight rather than around the clock, with a live-in superintendent anchoring operations. Amenities are the useful pre-war basics — central laundry, bike room, private storage — with no gym, garage, or roof deck. Compare actual maintenance, assessments and included services with specific full-service alternatives; the shorter doorman schedule alone does not establish lower carrying costs. The cooperative's offering plan is on file in The Roebling Research Library; current financial statements should be requested through the managing agent during diligence.

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 (2019): a median $998/sf (floor-adjusted) across 1 sale. The building has traded as recently as 2026. Median listing discount 0.7% 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 1-01512-0059). 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 policy stack is the headline. 75 percent financing, pieds-à-terre, guarantors, gifting, co-purchase, and one-year sublet seasoning make a flexible framework. If your purchase structure needs that latitude, this one deserves a look — but confirm every term with the managing agent, as policies evolve.

Calibrate the service model. The doorman covers 8 a.m. to midnight, not 24 hours. Assess how that schedule meets the household’s arrival and delivery needs, and compare actual carrying costs without assuming a savings from the coverage hours.

The location math is strong. The 4/5/6 express at 86th Street, Central Park and Museum Mile to the west, and the 86th Street retail spine to the north are nearby destinations. Walk the actual routes from the mid-block entrance.

Run the board numbers early. A 25-percent-minimum-down framework still comes with a board review; run the Co-op Board Qualification Calculator before offering, and have the conversion-history question (1980 plan versus 1984 conversion) on your attorney's checklist.

Verify the fee stack. The flip tax is not documented publicly, and sublet terms (one-year seasoning, three-year cap) come from listing records. Confirm both, plus any assessments, before contract.

Sell the structure, not just the apartment. The building's financing and flexibility framework materially widens your buyer pool relative to stricter neighbors — co-purchases, guarantor-backed and gift-funded purchases, and pieds-à-terre. Marketing that names these policies outperforms generic pre-war copy.

Anchor to the side-street market, not the avenues. Your comparables are the boutique pre-wars between Park and Third in the low 80s, not 1000 Park or the avenue corners. Pricing against the right set shortens days on market.

Condition drives the spread. In a four-per-floor building, same-line comparables are scarce; renovated-versus-estate condition explains most of the price variance. Run the Renovation Cost Calculator against your asking strategy if your unit is original.

If you're considering 124 East 84th Street, also evaluate:

• 1000 Park Avenue — the Park Avenue corner anchor of the block; the prestige step-up
• 1045 Park Avenue — Schwartz & Gross pre-war co-op two blocks north; the avenue alternative
• 1100 Park Avenue — larger pre-war co-op at 89th; the full-service Carnegie Hill step-up
• 170 East 78th Street — boutique pre-war co-op on a comparable Park-Lexington side street
• 180 East 79th Street — Schwartz & Gross side-street pre-war with larger lines
• 130 East 75th Street — side-street pre-war co-op with a similar boutique proposition further south
• 12 East 87th Street — the Capitol; pre-war co-op off Fifth at a similar price band
• 19 East 88th Street — Carnegie Hill pre-war co-op; a comparison farther north