860 United Nations Plaza

The West tower rises 38 floors in dark curtain-wall glass above the complex's six-story office base, its slab proportioned by two slightly protruding piers on the north and south facades — the detail architectural records single out as the massing's saving grace. Apartments carry nine-foot ceilings and the oversized windows that are the complex's defining interior feature; the architecture was always in service of the glass, and the glass is in service of the views. Lower floors (through roughly the 15th) were laid out at three-and-a-half to six rooms; the upper floors carry the larger simplexes, and the top eight floors of the two towers hold the complex's 56 duplexes — gallery-and-curved-staircase layouts, some with wood-burning fireplaces, that constitute the trophy inventory. Combinations across lines are common after six decades, and renovation quality varies widely line to line.

The two cooperatives share an operating plant that has few peers in the city: doormen, concierge, attended elevators, the triple-height lobby over the enclosed garden court, the full-block private driveway with its dedicated 49th Street approach off the FDR, valet garage, fitness center, library, four sundecks, party and game rooms, central laundry, and storage — supported by a staff documented at 46 in management-sourced records (some records cite 53). On-site management runs the complex day to day. Each tower maintains its own board, its own share schedule, and its own policy decisions; buyers should not assume that terms documented for one tower bind the other. The West tower's offering plan and amendments are on file in The Roebling Research Library.

Recent sales

Recent transfers at this building, curated by The Roebling Team research desk. Apartment-level facts are independently verified before publishing; sale prices reflect the recorded transfer amount at the NYC Department of Finance.

Market read. Most recent trades (2026) cleared a median $1,009/sf across 3 sales. Median listing discount 4.7% 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 1-01360-7501) and verified listing data. Apartment-level facts (line, condition, asking-price context) curated and cross-verified by The Roebling Team research desk. 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.

Understand the shared-lot structure before you fall in love. One tax lot, one BIN, two apartment corporations, and a commercial office base underneath — the offering plan describes the cooperative's interest as the air space its tower occupies. None of this is a defect; all of it is unusual, and your attorney should review how taxes, base-building costs, and shared-amenity expenses flow through maintenance.

The views are structural. The UN grounds across First Avenue cannot be built on, and the river cannot be built across. South- and east-facing lines buy permanence that almost no Midtown glass tower can promise; west-facing lines buy the Midtown skyline. Price the exposure, not the building average.

The policy framework is mid-century-co-op moderate, not Park Avenue strict. 75 percent financing per management-sourced records, pets permitted, subletting with board approval and a documented fee schedule, and a buyer-paid 3 percent flip tax. Verify each term against the West tower's current documents — the towers' policies are similar but not interchangeable. Run the Co-op Board Qualification Calculator before offering.

The buyer-paid flip tax changes your closing math. A 3 percent purchaser-paid transfer fee is uncommon and materially affects total acquisition cost — run it through the Buyer Closing Cost Calculator alongside the mansion tax.

Calibrate the neighborhood honestly. The complex is its own precinct — driveway, garden court, playground and Peter Detmold Park adjacent — but the blocks around the UN are quiet at night and the nearest subways are a real walk west. Buyers who love it love exactly that; spend an evening on the block.

Sell the complex's pedigree, at the West tower's price. Harrison & Abramovitz, the UN adjacency, the Le Corbusier-era site plan, the driveway and lobby sequence — the provenance is identical to the East tower's, and the West tower's relative pricing is the value argument. Market against 870's comparables deliberately.

Lead with the operating plant. The staffing depth, attended elevators, and amenity stack are the daily product here and they survive any buyer's diligence. State the service model plainly in the marketing.

Be precise about what is documented. Policies, fees, and financials should be presented from the building's current documents, not from complex-level lore — the two towers diverge in details, and sophisticated buyers' attorneys will catch imprecision. We provide the offering plan and amendments from the Research Library to serious buyers' counsel.

If you're considering 860 United Nations Plaza, also evaluate:

• 870 United Nations Plaza — the East tower of the same complex; identical architecture, separate cooperative, the deeper press-documented resident register
• 845 United Nations Plaza (Trump World Tower) — the corridor's 2001 condominium alternative across First Avenue, with permissive condo mechanics
• 100 United Nations Plaza — 1986 condominium peer a block north; the mid-scale condo alternative
• 425 East 58th Street (The Sovereign) — Emery Roth & Sons 1974; the closest post-war luxury co-op peer in scale and service
• 400 East 56th Street (Plaza 400) — 1968 post-war co-op peer with a similar full-service program
• 45 Sutton Place South — post-war Sutton Place co-op with river frontage
• 2 Sutton Place South — the pre-war trophy alternative on the river
• 1 Beekman Place — the corridor's old-line pre-war trophy co-op; the prestige step-up