Commercial condominium · Midtown, Manhattan
866 United Nations Plaza
New York, NY 10017
866 United Nations Plaza is a 37-floor commercial condominium in Midtown, Manhattan, built in 1967, with about 253,000 square feet of office space according to city records.
Also at 401-429 East 48th Street, 400-434 East 49th Street, 860-874 First Avenue and 860-874 United Nations Plaza.
- Office space
- 253K SF
- Floors
- 37
- Year built
- 1967
- Zoning
- C5-2
The 147th largest of the 351 office buildings we track in Midtown. Compare it with 6 neighbors
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Compared with its neighbors
How 866 United Nations Plaza compares
Next to the 6 nearest large office buildings, all within a 4 minute walk, 866 United Nations Plaza is the largest by office floor area. It went up in 1967; the median neighbor dates from 1967.
| Building | Office space | Floors | Built | Tax / SF |
|---|---|---|---|---|
| 866 United Nations Plaza | 253K SF | 37 | 1967 | $11.66 |
| 327 East 47th Street | 41K SF | 5 | 1971 | Exempt |
| 821 First Avenue | 116K SF | 35 | 2018 | Exempt |
| 809 First Avenue | 103K SF | 11 | 1964 | Exempt |
| 305 East 47th Street | 125K SF | 14 | 1928 | $3.46 |
| 315 East 46th Street | 50K SF | 9 | 2018 | Exempt |
| 305 East 46th Street | 154K SF | 16 | 1928 | $25.54 |
Sources: NYC Department of City Planning, PLUTO 26v2 for size, floors and year built; NYC Department of Finance 2026/27 roll for tax (taxable value times the class rate, before abatements, over the whole floor area). Large means at least 35,000 SF of the building's main use. Walking times are straight-line estimates.
NYC tax lot records
Building facts
- Other addresses
- 401-429 East 48th Street; 400-434 East 49th Street; 860-874 First Avenue; 860-874 United Nations Plaza
- ZIP code
- 10017
- Building type
- Commercial condominium (city class RC)
- Total floor area
- 306,964 SF
- Commercial floor area
- 306,964 SF
- Office
- 252,715 SF
- Retail
- 12,767 SF
- Height
- 37 floors
- Average floor
- About 8,300 SF (floor area divided by floors)
- Year built
- 1967
- Last major alteration
- 2009
- Lot area
- 88,357 SF
- Zoning district
- C5-2
- Built FAR
- 3.47
- Max commercial FAR
- 10
- Tax lot (BBL)
- 1013607501
Nearest subway
- Lexington Av/53 St
- Grand Central-42 St
- 59 St
Source: NYC Department of City Planning, PLUTO 26v2, pulled 2026-10-16; addresses from the Property Address Directory (PAD) 26b; subway stations from the MTA Subway Stations dataset, pulled 2026-10-16. Floor areas are the city's estimates for the whole building, not available space. Walking times are straight-line estimates. How we build these pages. Something wrong on this page? Tell us.
NYC storefront registry (Local Law 157)
Storefronts and vacancy
Owners registered one storefront at 866 United Nations Plaza for December 31, 2025, the newest annual filing the city has published, and it was not vacant that day.
- Storefronts registered for December 31, 2025
- 1
- Vacant that day
- 0
- Share vacant across Midtown
- 14.3%
- Share vacant along First Avenue
- 10.6%
- Share vacant citywide
- 9.2%
- Condominium tax lots that filed
- 1
Vacant on December 31, by year
Need a storefront in Midtown? Get matchedNYC storefront vacancy report
Source: NYC Department of Finance, Storefronts Reported Vacant or Not (Local Law 157), annual filings for 2019 to 2025, pulled 2026-10-16. Owners of buildings with ground- or second-floor storefronts register each one every year with its status on December 31; counts are by tax lot, summed over the condominium's unit lot that filed, as the owners filed them. The 2025 filing was due June 1, 2026, so a storefront vacant then may have been leased since. A vacant storefront is not always on the market, and none here is listed on Leasemark unless it shows above.
NYC Department of Finance records
Owner, property tax and assessed value
866 United Nations Plaza is a condominium of 85 tax lots with 42 owners of record, none holding half of its market value. For tax year 2026/27 the city values 866 United Nations Plaza at $142.4 million and assesses it at $64.1 million. After phase-ins and exemptions its taxable value is $33 million; at the Class 4 rate of 10.848% (tax year 2025/26, the latest rate the Department of Finance lists) that comes to about $3.58 million a year before abatements, roughly $11.66 per square foot of floor area. Commercial leases here often pass a tenant's share of tax increases over a base year through as additional rent.
- Tax class
- Class 4 (commercial and industrial)
- City market value
- $142,440,602
- Land market value
- $23,699,999
- Assessed value
- $64,098,272
- Taxable value (phased in)
- $62,234,519
- Exemptions
- $29,250,383
- Estimated yearly tax
- About $3.58 million
- Tax per SF of floor area
- About $11.66
- Condominium tax lots
- 85
- Owners of record
- 42
City market value by tax year
Manage or lease this building? Claim this page. Requests are reviewed by hand.
How to find who owns any NYC buildingSource: NYC Department of Finance, Property Valuation and Assessment Data (2026/27 roll, summed over 85 condominium tax lots; owner names as the roll records them, which cuts some long names short), pulled 2026-10-16; tax rate from the Department of Finance tax rates page, checked 2026-09-28. The estimate is the taxable value times the class rate. It leaves out abatements, payment-in-lieu-of-taxes agreements and charges, so the actual bill can differ.
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NYC energy benchmarking (Local Law 84)
Energy score, grade and emissions
866 United Nations Plaza reported an ENERGY STAR score of 93 out of 100 for 2024 in its Local Law 84 benchmarking filing. Under Local Law 33 that score earns an A (85 or higher). Its site energy use came to 33.5 kBtu per square foot, 42% below the national median of 57.7 for a similar property. Its greenhouse gas emissions were about 4,199 metric tons of CO2e (3.21 kg per square foot). The filing covers 3 tax lots together, so these figures are for the whole property.
- ENERGY STAR score (2024)
- 93 of 100
- Grade this score earns (Local Law 33)
- A (85 or higher)
- Property type (Portfolio Manager)
- Multifamily Housing
- Site energy use intensity
- 33.5 kBtu/SF
- National median for the type
- 57.7 kBtu/SF
- Greenhouse gas emissions
- 4,199 t CO2e
- Emissions per SF
- 3.21 kg CO2e
- Floor area in the filing
- 1,308,418 SF
- Tax lots in the filing
- 3
ENERGY STAR score by year
Energy sources in 2024
Source: NYC Department of Buildings and Mayor's Office of Climate and Environmental Justice, NYC Building Energy and Water Data Disclosure for Local Law 84 (2024 filing, one filing for 3 tax lots), pulled 2026-10-16; grade cutoffs from the Department of Buildings energy grades page. Figures are as the owner filed them in ENERGY STAR Portfolio Manager. The grade is the one the filed score earns under the law's cutoffs; the Department of Buildings assigns the grade a building posts, which can differ.
NYC Department of Buildings permits
Work permits and build-outs
In the 12 months to October 2026, the Department of Buildings issued first permits for 6 jobs at 866 United Nations Plaza. In the last two years, interior work was permitted on 6 floors (floors 5, 9, 23, 29, 37 and 38). The newest build-out, on floor 29, was first permitted in July 2026 (construction, plumbing; filed cost estimate $486,000).
- New jobs, last 12 months
- 6
- Initial permits, last 12 months
- 9
- Newest job first permitted
- August 2026
- Interior build-outs, last 24 months
- 5
- Floors with interior work, last 24 months
- 5, 9, 23, 29, 37 and 38
Recent build-outs
New jobs by year
Build-outs across MidtownWhere NYC offices are being built out
Source: NYC Department of Buildings, DOB NOW: Build Approved Permits, pulled 2026-10-24 (permits issued through 2026-10-22). A job counts once, when its first permit is issued; renewals are not new work. A build-out groups jobs on the same floors first permitted within 120 days of each other. Costs are the estimates filed with the jobs. Jobs filed before DOB NOW (in the older BIS system) are not counted. A permit is approval to do the work; it does not say who the work is for or whether it is finished.
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Next door, in the Upper East Side
783 Madison 4th Floor
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Questions about 866 United Nations Plaza
How big is 866 United Nations Plaza?
866 United Nations Plaza has about 307,000 square feet of floor area in total, including 253,000 square feet of office and 13,000 square feet of retail, according to NYC PLUTO 26v2. These are the city's estimates for the whole building, not space that is available.
When was 866 United Nations Plaza built?
City records list 1967 as the year built, with a major alteration recorded in 2009. The building is 37 floors tall.
What other addresses does 866 United Nations Plaza have?
City records list 401-429 East 48th Street, 400-434 East 49th Street, 860-874 First Avenue and 860-874 United Nations Plaza on the same tax lot (BBL 1013607501) as 866 United Nations Plaza. A space listed on Leasemark at any of these addresses shows up on this page.
What is the ZIP code of 866 United Nations Plaza?
866 United Nations Plaza is in ZIP code 10017, according to the city's tax lot records (NYC PLUTO 26v2) and the Department of Finance's assessment roll. The full mailing address is 866 United Nations Plaza, New York, NY 10017, in Midtown.
What is the zoning at 866 United Nations Plaza?
The lot is in the C5-2 zoning district. PLUTO lists a built floor area ratio (FAR) of 3.47 and a maximum commercial FAR of 10 for this lot.
What subway station is closest to 866 United Nations Plaza?
The closest subway station to 866 United Nations Plaza is Lexington Av/53 St (the E, F and 6 trains, connected to 51 St), about 0.4 miles away in a straight line, roughly 8 minutes on foot. The MTA lists it as an accessible station. Also nearby: Grand Central-42 St (the 4, 5, 6, 7 and S trains), 11 min walk; 59 St (the 4, 5, 6, N, R and W trains, connected to Lexington Av/59 St), 14 min walk. Walking times are straight-line estimates; the street route is longer.
Who owns 866 United Nations Plaza?
866 United Nations Plaza is a condominium of 85 tax lots with 42 owners of record, none holding half of its market value. That is from the NYC Department of Finance's 2026/27 assessment roll (BBL 1013607501). Deeds and mortgages for each unit are public in ACRIS, the city's property records system.
What is the energy grade of 866 United Nations Plaza?
866 United Nations Plaza reported an ENERGY STAR score of 93 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 93 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 33.5 kBtu per square foot, 42% below the national median of 57.7 for a similar property. Its greenhouse gas emissions were about 4,199 metric tons of CO2e (3.21 kg per square foot). The filing covers 3 tax lots together, so these figures are for the whole property.
Is there construction at 866 United Nations Plaza?
In the 12 months to October 2026, the Department of Buildings issued first permits for 6 jobs at 866 United Nations Plaza. In the last two years, interior work was permitted on 6 floors (floors 5, 9, 23, 29, 37 and 38). The newest build-out, on floor 29, was first permitted in July 2026 (construction, plumbing; filed cost estimate $486,000). These are the Department of Buildings' DOB NOW work permits for tax lot 1013607501. A permit is approval to do the work; it does not say who the work is for or whether it is finished.
What are the property taxes at 866 United Nations Plaza?
The Department of Finance's 2026/27 assessment roll lists a taxable value of $33 million for 866 United Nations Plaza (the sum of its 85 condominium tax lots). At the Class 4 rate of 10.848% (tax year 2025/26, the latest rate the Department of Finance lists), that is about $3.58 million a year, roughly $11.66 per square foot of floor area, before abatements such as ICAP. The city's property tax records for BBL 1013607501 show the actual bill.
What is the assessed value of 866 United Nations Plaza?
For tax year 2026/27, the NYC Department of Finance puts the market value of 866 United Nations Plaza at $142.4 million ($23.7 million of it land) and its assessed value at $64.1 million, the 45% of market value the city assesses for Class 4 property. The city's market value rose 14% from 2022/23 ($124.4 million) to 2026/27.
Are there vacant storefronts at 866 United Nations Plaza?
Owners registered one storefront at 866 United Nations Plaza for December 31, 2025, the newest annual filing the city has published, and it was not vacant that day. 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.
Is there office space for lease at 866 United Nations Plaza?
No space at 866 United Nations Plaza 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.
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