320 Park Avenue

320 Park Avenue has about 656,000 square feet of floor area in total, including 638,000 square feet of office, 19,000 square feet of retail and 0 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 1994 as the year built. The building is 33 floors tall.

City records list 39-51 East 50th Street, 38-50 East 51st Street and 320-336 Park Avenue on the same tax lot (BBL 1012860035) as 320 Park Avenue. A space listed on Leasemark at any of these addresses shows up on this page.

320 Park 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 320 Park Avenue, New York, NY 10022, in Midtown.

The lot is in the C5-3 zoning district. PLUTO lists a built floor area ratio (FAR) of 21.43 and a maximum commercial FAR of 15 for this lot.

The closest subway station to 320 Park Avenue is 51 St (the 6, E and F trains, connected to Lexington Av/53 St), about 650 feet away in a straight line, roughly 3 minutes on foot. The MTA lists it as an accessible station. Also nearby: 5 Av/53 St (the E and F trains), 4 min walk; 47-50 Sts-Rockefeller Ctr (the B, D, F and M trains), 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 320 PARK AVENUE LLC as the owner of record of 320 Park Avenue (BBL 1012860035). 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 320 Park Avenue. 4 public companies report the address as their principal executive office: CURBLINE PROPERTIES CORP. (CURB); EXLSERVICE HOLDINGS, INC. (EXLS); LADDER CAPITAL CORP (LADR); and AUDAX PRIVATE CREDIT FUND, LLC. 7 investment managers and funds file 13F holdings reports from the address, including Knighthead Capital Management, LLC; MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC; and PZENA INVESTMENT 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.

320 Park Avenue reported an ENERGY STAR score of 74 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 74 earns a B. 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 61.3 kBtu per square foot, 30% below the national median of 87.6 for a similar property. Its greenhouse gas emissions were about 4,383 metric tons of CO2e (6.07 kg per square foot).

At its 2024 energy use, 320 Park Avenue comes to about 3,168 metric tons of CO2e a year under Local Law 97's coefficients, against a limit of 6,135 tons for 2024 to 2029 (52% of the limit), so it would owe no penalty. From 2030 the limit drops to 2,686 tons and the same energy use counts as about 1,890 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 20 jobs at 320 Park Avenue. In the last two years, interior work was permitted on 11 floors (floors 1 to 3, 16, 17, 20 to 22, 27, 29 and 33 and the ground floor). The newest build-out, on floor 1, was first permitted in October 2026 (construction; filed cost estimate $485,000). These are the Department of Buildings' DOB NOW work permits for tax lot 1012860035. 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 $135.7 million for 320 Park Avenue. At the Class 4 rate of 10.848% (tax year 2025/26, the latest rate the Department of Finance lists), that is about $14.7 million a year, roughly $22.42 per square foot of floor area, before abatements such as ICAP. The city's property tax records for BBL 1012860035 show the actual bill.

For tax year 2026/27, the NYC Department of Finance puts the market value of 320 Park Avenue at $307.7 million ($60 million of it land) and its assessed value at $138.5 million, the 45% of market value the city assesses for Class 4 property. The city's market value fell 12% from 2022/23 ($348.9 million) to 2026/27.

Owners registered 5 storefronts at 320 Park Avenue for December 31, 2025, the newest annual filing the city has published, and none stood vacant that day. A year earlier, 1 of 5 stood vacant. These are the owners' filings with the Department of Finance under Local Law 157, so a storefront may have come free since. Owners and brokers can list a storefront on Leasemark for free.

No space at 320 Park 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.