55 Prospect Street

55 Prospect Street has about 256,000 square feet of floor area in total, including 237,000 square feet of office and 19,000 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 1967 as the year built, with a major alteration recorded in 2014. The building is 10 floors tall.

City records list 107-115 Adams Street, 130-138 Pearl Street and 53-73 Prospect Street on the same tax lot (BBL 3000630001) as 55 Prospect Street. A space listed on Leasemark at any of these addresses shows up on this page.

55 Prospect Street is in ZIP code 11201, according to the city's tax lot records (NYC PLUTO 26v2) and the Department of Finance's assessment roll. The full mailing address is 55 Prospect Street, Brooklyn, NY 11201, in Dumbo.

The lot is in the M1-6 zoning district. PLUTO lists a built floor area ratio (FAR) of 12.37 and a maximum commercial FAR of 10 for this lot.

The closest subway station to 55 Prospect Street is York St (the F train), about 450 feet away in a straight line, roughly 2 minutes on foot. Also nearby: High St (the A and C trains), 3 min walk; Clark St (the 2 and 3 trains), 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 RFR/K 55 PROSPECT OWNER LLC as the owner of record of 55 Prospect Street (BBL 3000630001). 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 55 Prospect Street. One investment manager files 13F holdings reports from the address: Square Wave Capital, 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.

55 Prospect Street last sold in March 2017 for $138.1 million, according to the deed recorded with the city. IMRF WATCHTOWER MEMBER, LLC sold it to KC 55 PROSPECT OWNER LLC, RFR 55 PROSPECT OWNER LLC and others. That comes to about $539 per square foot of floor area. The deed is ACRIS document 2017040700029011 (BBL 3000630001) 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.

55 Prospect Street reported an ENERGY STAR score of 67 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 67 earns a C. 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 54.5 kBtu per square foot, 21% below the national median of 69.3 for a similar property. Its greenhouse gas emissions were about 1,250 metric tons of CO2e (4.91 kg per square foot).

At its 2024 energy use, 55 Prospect Street comes to about 998 metric tons of CO2e a year under Local Law 97's coefficients, against a limit of 1,928 tons for 2024 to 2029 (52% of the limit), so it would owe no penalty. From 2030 the limit drops to 684 tons and the same energy use counts as about 648 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.

The Department of Buildings issued no permits for new jobs at 55 Prospect Street in the 12 months to October 2026; the last one was first permitted in October 2022. These are the Department of Buildings' DOB NOW work permits for tax lot 3000630001. 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 $24.2 million for 55 Prospect Street. At the Class 4 rate of 10.848% (tax year 2025/26, the latest rate the Department of Finance lists), that is about $2.62 million a year, roughly $10.24 per square foot of floor area, before abatements such as ICAP. The city's property tax records for BBL 3000630001 show the actual bill.

For tax year 2026/27, the NYC Department of Finance puts the market value of 55 Prospect Street at $55.3 million ($1.21 million of it land) and its assessed value at $24.9 million, the 45% of market value the city assesses for Class 4 property. The city's market value rose 12% from 2022/23 ($49.2 million) to 2026/27.

Owners registered 8 storefronts at 55 Prospect Street for December 31, 2025, the newest annual filing the city has published, and 3 of them stood vacant that day. At least one storefront here has been reported vacant at the end of every year since 2019. 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 55 Prospect Street 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.