850 Third Avenue

850 Third Avenue has about 575,000 square feet of floor area in total, including 513,000 square feet of office, 6,000 square feet of retail and 21,000 square feet of industrial and storage space, according to NYC PLUTO 26v2. These are the city's estimates for the whole building, not space that is available.

City records list 1960 as the year built, with a major alteration recorded in 1997. The building is 20 floors tall.

City records list 161-175 East 51st Street, 160-164 East 52nd Street and 838-852 Third Avenue on the same tax lot (BBL 1013060033) as 850 Third Avenue. A space listed on Leasemark at any of these addresses shows up on this page.

850 Third Avenue is in ZIP code 10022, according to the city's tax lot records (NYC PLUTO 26v2) and the Department of Finance's assessment roll. The full mailing address is 850 Third Avenue, New York, NY 10022, in Midtown.

The lot is in the C6-6 zoning district. PLUTO lists a built floor area ratio (FAR) of 18.17 and a maximum commercial FAR of 15 for this lot.

The closest subway station to 850 Third Avenue is 51 St (the 6, E and F trains, connected to Lexington Av/53 St), about 400 feet away in a straight line, roughly 1 minute on foot. The MTA lists it as an accessible station. Also nearby: 5 Av/53 St (the E and F trains), 7 min walk; 59 St (the 4, 5, 6, N, R and W trains, connected to Lexington Av/59 St), 8 min walk. Walking times are straight-line estimates; the street route is longer.

The NYC Department of Finance's 2026/27 assessment roll lists 850 THIRD AVENUE OWNER, LLC as the owner of record of 850 Third Avenue (BBL 1013060033). Big buildings are usually held through a company set up for that one property, so the name on the roll can differ from the landlord's brand or the managing agent. Deeds and mortgages for the lot are public in ACRIS, the city's property records system.

Leasemark does not have the building's tenant roster, but SEC filings name companies with offices at 850 Third Avenue. One investment manager files 13F holdings reports from the address: Shannon River Fund Management LLC. Private companies do not file with the SEC, so the full list of tenants is longer, and a company can also report a building it owns.

850 Third Avenue last sold in January 2019 for $422 million, according to the deed recorded with the city. 850 THIRD AVENUE HOLDING LLC sold it to 850 THIRD AVENUE OWNER, LLC. That comes to about $734 per square foot of floor area. The deed is ACRIS document 2019010900433001 (BBL 1013060033) in the city's property records. A sale of the company that owns a building is not recorded as a deed, so it would not show there.

850 Third Avenue reported an ENERGY STAR score of 89 for calendar year 2024 in its Local Law 84 benchmarking filing. Under Local Law 33, as amended by Local Law 95 of 2019, a score of 85 or higher earns an A, 70 to 84 a B, 55 to 69 a C and under 55 a D, so 89 earns an A. The Department of Buildings assigns the grade a building posts, so the posted label can differ if a filing was corrected. Its site energy use came to 50.3 kBtu per square foot, 50% below the national median of 100.4 for a similar property. Its greenhouse gas emissions were about 2,271 metric tons of CO2e (4.41 kg per square foot).

In the 12 months to October 2026, the Department of Buildings issued first permits for 10 jobs at 850 Third Avenue. In the last two years, interior work was permitted on 22 floors (floors 1 to 22 and the cellar). The newest build-out, on floors 2 to 21, the facade and the roof, was first permitted in May 2026 (construction; filed cost estimate $6.6 million). A sidewalk shed permit here is active until December 2, 2026. These are the Department of Buildings' DOB NOW work permits for tax lot 1013060033. A permit is approval to do the work; it does not say who the work is for or whether it is finished.

The Department of Finance's 2026/27 assessment roll lists exemptions covering the whole taxable value of 850 Third Avenue, so there is no property tax on the roll to estimate. That is common for government, nonprofit and payment-in-lieu-of-taxes (PILOT) properties. The city's property tax records for BBL 1013060033 show what is actually billed.

For tax year 2026/27, the NYC Department of Finance puts the market value of 850 Third Avenue at $155.1 million ($53.3 million of it land) and its assessed value at $69.8 million, the 45% of market value the city assesses for Class 4 property. The city's market value held steady from 2022/23 to 2026/27.

Owners registered 5 storefronts at 850 Third Avenue for December 31, 2025, the newest annual filing the city has published, and 2 of them stood vacant that day. These are the owners' filings with the Department of Finance under Local Law 157, so a storefront vacant on December 31, 2025 may have been leased since. Owners and brokers can list a storefront on Leasemark for free.

No space at 850 Third Avenue is listed on Leasemark right now. Nearby on Leasemark: office space for lease at 783 Madison 4th Floor in the Upper East Side (994 SF, $66.40/SF/yr). Owners and brokers can list space here for free, and tenants can post a requirement to be matched when space opens up.