830 Third Avenue

830 Third Avenue has about 151,000 square feet of floor area in total, including 135,000 square feet of office, 11,000 square feet of retail and 4,000 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 1958 as the year built, with a major alteration recorded in 2025. The building is 13 floors tall.

City records list 168-172 East 51st Street and 826-836 Third Avenue on the same tax lot (BBL 1013050040) as 830 Third Avenue. A space listed on Leasemark at any of these addresses shows up on this page.

830 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 830 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 15 and a maximum commercial FAR of 15 for this lot.

The closest subway station to 830 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 2 minutes on foot. The MTA lists it as an accessible station. Also nearby: 5 Av/53 St (the E and F trains), 7 min walk; Grand Central-42 St (the 4, 5, 6, 7 and S trains), 9 min walk. Walking times are straight-line estimates; the street route is longer.

The NYC Department of Finance's 2026/27 assessment roll lists THIRD CITY REALTY LLC as the owner of record of 830 Third Avenue (BBL 1013050040). 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.

830 Third Avenue last sold in August 2022 for $72 million, according to the deed recorded with the city. MP 830 THIRD AVENUE, L.L.C sold it to EMPIRE 830 THIRD LLC and THIRD CITY REALTY LLC. The deed is ACRIS document 2022092900052001 (BBL 1013050040) 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.

830 Third Avenue reported an ENERGY STAR score of 91 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 91 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 37.5 kBtu per square foot, less than half the national median of 81.5 for a similar property. Its greenhouse gas emissions were about 593 metric tons of CO2e (3.68 kg per square foot).

At its 2024 energy use, 830 Third Avenue comes to about 445 metric tons of CO2e a year under Local Law 97's coefficients, against a limit of 1,222 tons for 2024 to 2029 (36% of the limit), so it would owe no penalty. From 2030 the limit drops to 429 tons and the same energy use counts as about 267 tons, still under the limit. This is an estimate from the owner's 2024 benchmarking filing using the coefficients and per-use limits in the law and the Department of Buildings rule, at $268 per ton over. It is not the building's Local Law 97 report, which can count credits and deductions this estimate cannot.

In the 12 months to October 2026, the Department of Buildings issued first permits for 2 jobs at 830 Third Avenue. In the last two years, interior work was permitted on 14 floors (floors 1 to 14, the cellar and the mezzanine). The newest build-out, on floors 1 to 14, the cellar, the mezzanine and the roof, was first permitted in March 2026 (construction, mechanical, plumbing, sprinklers, structural; filed cost estimate $12 million). A sidewalk shed permit here is active until November 2, 2026. These are the Department of Buildings' DOB NOW work permits for tax lot 1013050040. 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 a taxable value of $18.3 million for 830 Third Avenue. At the Class 4 rate of 10.848% (tax year 2025/26, the latest rate the Department of Finance lists), that is about $1.98 million a year, roughly $13.14 per square foot of floor area, before abatements such as ICAP. The city's property tax records for BBL 1013050040 show the actual bill.

For tax year 2026/27, the NYC Department of Finance puts the market value of 830 Third Avenue at $42 million ($12.5 million of it land) and its assessed value at $18.9 million, the 45% of market value the city assesses for Class 4 property. The city's market value rose 6% from 2022/23 ($39.5 million) to 2026/27.

No space at 830 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.