5 Union Square

5 Union Square has about 92,000 square feet of floor area in total, including 74,000 square feet of office and 18,000 square feet of retail, according to NYC PLUTO 26v2. These are the city's estimates for the whole building, not space that is available.

City records list 1900 as the year built, with a major alteration recorded in 1989. The building is 8 floors tall.

City records list 5-9 Union Square and 5-9 Union Square West on the same tax lot (BBL 1008420023) as 5 Union Square. A space listed on Leasemark at any of these addresses shows up on this page.

5 Union Square is in ZIP code 10003, according to the city's tax lot records (NYC PLUTO 26v2) and the Department of Finance's assessment roll. The full mailing address is 5 Union Square, New York, NY 10003, in Union Square.

The lot is in the C6-4 zoning district. PLUTO lists a built floor area ratio (FAR) of 8.95 and a maximum commercial FAR of 10 for this lot.

The closest subway station to 5 Union Square is 14 St-Union Sq (the 4, 5, 6, L, N, Q, R and W trains), about 350 feet away in a straight line, roughly 1 minute on foot. The MTA lists it as an accessible station. Also nearby: 6 Av (the L, 1, 2, 3, F and M trains, connected to 14 St), 6 min walk; 3 Av (the L train), 7 min walk. Walking times are straight-line estimates; the street route is longer.

The NYC Department of Finance's 2026/27 assessment roll lists SQUARE WEST LLC as the owner of record of 5 Union Square (BBL 1008420023). 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.

5 Union Square reported an ENERGY STAR score of 77 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 77 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 69.5 kBtu per square foot, 33% below the national median of 103.7 for a similar property. Its greenhouse gas emissions were about 762 metric tons of CO2e (7.13 kg per square foot).

In the 12 months to September 2026, the Department of Buildings issued first permits for 3 jobs at 5 Union Square. In the last two years, interior work was permitted on 3 floors (floors 3, 6 and 8). The newest build-out, on floor 6, was first permitted in March 2026 (construction, plumbing; filed cost estimate $83,000). These are the Department of Buildings' DOB NOW work permits for tax lot 1008420023. 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 $9.19 million for 5 Union Square. At the Class 4 rate of 10.848% (tax year 2025/26, the latest rate the Department of Finance lists), that is about $996,401 a year, roughly $10.78 per square foot of floor area, before abatements such as ICAP. The city's property tax records for BBL 1008420023 show the actual bill.

For tax year 2026/27, the NYC Department of Finance puts the market value of 5 Union Square at $22.8 million ($7 million of it land) and its assessed value at $10.3 million, the 45% of market value the city assesses for Class 4 property. The city's market value rose 23% from 2022/23 ($18.5 million) to 2026/27.

No space at 5 Union Square is listed on Leasemark right now. Owners and brokers can list space here for free, and tenants can post a requirement to be matched when space opens up.