Want · Office
Series B fintech needs 8,000 to 12,000 SF
Posted by the tenant · Fintech
- Where
- Midtown South, Flatiron +1
- Size
- 8,000 to 12,000 SF
- Budget
- to $85/SF
- Move in
- Jan 2027
Near subwayHigh ceilings
Owners: got a fit?I have a fit
Office building with commercial space · Flatiron, Manhattan
45 West 21st Street
New York, NY 10010
45 West 21st Street is a 6-floor office building with commercial space in Flatiron, Manhattan, built in 1902, with about 50,000 square feet of office space according to city records.
Also at 45-51 West 21st Street.
- Office space
- 50K SF
- Floors
- 6
- Year built
- 1902
- Zoning
- C6-4A
The 74th largest of the 75 office buildings we track in Flatiron. Compare it with 6 neighbors
No space at 45 West 21st Street is listed on Leasemark yet. Own or broker space here? List it free and it is matched against every active requirement the day it goes up, or import a spreadsheet of up to 50 spaces at once.
Compared with its neighbors
How 45 West 21st Street compares
Next to the 6 nearest large office buildings, all within a 1 minute walk, 45 West 21st Street is the smallest by office floor area. Built in 1902, it is the oldest of them. Its estimated property tax, about $9.41 a square foot of floor area before abatements, is below the neighbors' median of $12.65.
| Building | Office space | Floors | Built | Tax / SF | Last sale |
|---|---|---|---|---|---|
| 45 West 21st Street | 50K SF | 6 | 1902 | $9.41 | n/a |
| 56 West 22nd Street | 51K SF | 12 | 1908 | $12.53 | Mar 2020, $48.5M |
| 54 West 21st Street | 110K SF | 12 | 1910 | $12.78 | n/a |
| 38 West 21st Street | 63K SF | 12 | 1908 | $14.68 | Jun 2025, $31M |
| 37 West 20th Street | 97K SF | 12 | 1910 | $14.82 | n/a |
| 30 West 21st Street | 58K SF | 15 | 1907 | $7.99 | Jun 2013, $38.5M |
| Brogan Building, 27 West 20th Street | 92K SF | 12 | 1908 | $10.48 | n/a |
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); ACRIS for the last deed that moved the whole lot for a real price (a price for several lots is their combined price; condominiums sell by the unit and show n/a). Large means at least 50,000 SF of the building's main use. Walking times are straight-line estimates.
NYC tax lot records
Building facts
- Other address
- 45-51 West 21st Street
- ZIP code
- 10010
- Building type
- Office building with commercial space (city class O5)
- Total floor area
- 70,000 SF
- Commercial floor area
- 70,000 SF
- Office
- 50,000 SF
- Retail
- 20,000 SF
- Height
- 6 floors
- Average floor
- About 11,700 SF (floor area divided by floors)
- Year built
- 1902
- Lot area
- 10,820 SF
- Zoning district
- C6-4A
- Built FAR
- 6.47
- Max commercial FAR
- 10
- Historic district
- Ladies' Mile Historic District
- Tax lot (BBL)
- 1008230010
Nearest subway
- 23 St
- 23 St
- 23 St
Nearby large buildings
- 37 West 22nd Street
- Spero Building, 19 West 21st Street
- 22 West 21st Street
- Taylor Building, 20 West 22nd Street
- 15 West 21st Street
- Crystal Building, 40 West 20th Street
- Adams Dry Goods Building, 675 Avenue of the Americas
- 40 West 23rd Street
Source: NYC Department of City Planning, PLUTO 26v2, pulled 2026-09-30; addresses from the Property Address Directory (PAD) 26b; subway stations from the MTA Subway Stations dataset, pulled 2026-10-02. 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 2 storefronts at 45 West 21st Street for December 31, 2024, the newest annual filing the city has published, and none stood vacant that day.
- Storefronts registered for December 31, 2024
- 2
- Vacant that day
- 0
- Share vacant across Flatiron
- 13.5%
- Share vacant along West 21st Street
- 8.8%
- Share vacant citywide
- 8.7%
Vacant on December 31, by year
Need a storefront in Flatiron? Get matchedStorefront vacancy across New York City
Source: NYC Department of Finance, Storefronts Reported Vacant or Not (Local Law 157), annual filings for 2019 to 2024, pulled 2026-10-02. 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, as the owners filed them. The 2024 filing was due June 3, 2025, 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
The Department of Finance lists 45 WEST 21ST ST. ASSOCIATES as the owner of record. For tax year 2026/27 the city values 45 West 21st Street at $13.7 million and assesses it at $6.19 million. After phase-ins and exemptions its taxable value is $6.07 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 $658,830 a year before abatements, roughly $9.41 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.
- Owner of record
- 45 WEST 21ST ST. ASSOCIATES
- Tax class
- Class 4 (commercial and industrial)
- City market value
- $13,745,000
- Land market value
- $2,000,000
- Assessed value
- $6,185,250
- Taxable value (phased in)
- $6,073,290
- Estimated yearly tax
- About $658,830
- Tax per SF of floor area
- About $9.41
City market value by tax year
Source: NYC Department of Finance, Property Valuation and Assessment Data (2026/27 roll; owner names as the roll records them, which cuts some long names short), pulled 2026-10-02; 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.
NYC energy benchmarking (Local Law 84)
Energy score, grade and emissions
45 West 21st Street reported an ENERGY STAR score of 85 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 50.8 kBtu per square foot, 44% below the national median of 90.6 for a similar property. Its greenhouse gas emissions were about 323 metric tons of CO2e (4.31 kg per square foot).
- ENERGY STAR score (2024)
- 85 of 100
- Grade this score earns (Local Law 33)
- A (85 or higher)
- Property type (Portfolio Manager)
- Office
- Site energy use intensity
- 50.8 kBtu/SF
- National median for the type
- 90.6 kBtu/SF
- Greenhouse gas emissions
- 323 t CO2e
- Emissions per SF
- 4.31 kg CO2e
- Floor area in the filing
- 74,900 SF
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), pulled 2026-10-02; 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
The Department of Buildings issued no permits for new jobs at 45 West 21st Street in the 12 months to September 2026; the last one was first permitted in December 2024. In the last two years, interior work was permitted on one floor (floor 2). The newest build-out, on floor 2, was first permitted in December 2024 (construction, plumbing; filed cost estimate $13,000).
- New jobs, last 12 months
- 0
- Initial permits, last 12 months
- 0
- Newest job first permitted
- December 2024
- Interior build-outs, last 24 months
- 1
- Floors with interior work, last 24 months
- 2
Recent build-outs
New jobs by year
Build-outs across FlatironWhere NYC offices are being built out
Source: NYC Department of Buildings, DOB NOW: Build Approved Permits, pulled 2026-10-02 (permits issued through 2026-09-30). 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.
Landmarks Preservation Commission records
Architecture and history
45 West 21st Street was designed by William Ormiston Tait and built in 1902 in the Beaux-Arts style. It stands in the Ladies' Mile Historic District, so exterior changes and new signage go through the Landmarks Preservation Commission.
- Architect
- William Ormiston Tait
- Constructed
- 1902
- Style
- Beaux-Arts
- Primary material
- Brick
- Built as
- Store and lofts
Source: NYC Landmarks Preservation Commission, Individual Landmark and Historic District Building Database on NYC Open Data, pulled 2026-10-02. A designation can cover part of a lot, such as a facade or a lobby interior.
Office space nearby in Flatiron
Nothing is listed nearby yet. The labeled examples below show how a space appears; they are not on the market.
What a requirement here looks like
No live requirements for office space in Flatiron yet. These labeled examples show what tenants post. List a space in 45 West 21st Street and we match it against every new one automatically.
Want · Office
Startup seeking furnished sublease
Posted by the tenant · Software
- Where
- Flatiron, Midtown South +1
- Size
- 6,000 to 11,000 SF
- Budget
- to $60/SF
- Move in
- Nov 2026
Furnished
Owners: got a fit?I have a fit
Before you sign
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Questions about 45 West 21st Street
How big is 45 West 21st Street?
45 West 21st Street has about 70,000 square feet of floor area in total, including 50,000 square feet of office and 20,000 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 45 West 21st Street built?
The Landmarks Preservation Commission's building records date 45 West 21st Street to 1902, designed by William Ormiston Tait. The building is 6 floors tall.
Who designed 45 West 21st Street?
William Ormiston Tait, according to the Landmarks Preservation Commission's building records, which list the style as Beaux-Arts and its original use as store and lofts.
What other addresses does 45 West 21st Street have?
City records list 45-51 West 21st Street on the same tax lot (BBL 1008230010) as 45 West 21st Street. A space listed on Leasemark at any of these addresses shows up on this page.
What is the ZIP code of 45 West 21st Street?
45 West 21st Street is in ZIP code 10010, according to the city's tax lot records (NYC PLUTO 26v2) and the Department of Finance's assessment roll. The full mailing address is 45 West 21st Street, New York, NY 10010, in Flatiron.
What is the zoning at 45 West 21st Street?
The lot is in the C6-4A zoning district. PLUTO lists a built floor area ratio (FAR) of 6.47 and a maximum commercial FAR of 10 for this lot. It is inside the Ladies' Mile Historic District, so exterior changes go through the Landmarks Preservation Commission.
What subway station is closest to 45 West 21st Street?
The closest subway station to 45 West 21st Street is 23 St (the F and M trains), about 500 feet away in a straight line, roughly 2 minutes on foot. Also nearby: 23 St (the R and W trains), 4 min walk; 23 St (the 1 train), 5 min walk. Walking times are straight-line estimates; the street route is longer.
Who owns 45 West 21st Street?
The NYC Department of Finance's 2026/27 assessment roll lists 45 WEST 21ST ST. ASSOCIATES as the owner of record of 45 West 21st Street (BBL 1008230010). Deeds and mortgages for the lot are public in ACRIS, the city's property records system.
What is the energy grade of 45 West 21st Street?
45 West 21st Street reported an ENERGY STAR score of 85 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 85 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 50.8 kBtu per square foot, 44% below the national median of 90.6 for a similar property. Its greenhouse gas emissions were about 323 metric tons of CO2e (4.31 kg per square foot).
Is there construction at 45 West 21st Street?
The Department of Buildings issued no permits for new jobs at 45 West 21st Street in the 12 months to September 2026; the last one was first permitted in December 2024. In the last two years, interior work was permitted on one floor (floor 2). The newest build-out, on floor 2, was first permitted in December 2024 (construction, plumbing; filed cost estimate $13,000). These are the Department of Buildings' DOB NOW work permits for tax lot 1008230010. 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 45 West 21st Street?
The Department of Finance's 2026/27 assessment roll lists a taxable value of $6.07 million for 45 West 21st Street. At the Class 4 rate of 10.848% (tax year 2025/26, the latest rate the Department of Finance lists), that is about $658,830 a year, roughly $9.41 per square foot of floor area, before abatements such as ICAP. The city's property tax records for BBL 1008230010 show the actual bill.
What is the assessed value of 45 West 21st Street?
For tax year 2026/27, the NYC Department of Finance puts the market value of 45 West 21st Street at $13.7 million ($2 million of it land) and its assessed value at $6.19 million, the 45% of market value the city assesses for Class 4 property. The city's market value rose 3% from 2022/23 ($13.3 million) to 2026/27.
Are there vacant storefronts at 45 West 21st Street?
Owners registered 2 storefronts at 45 West 21st Street for December 31, 2024, the newest annual filing the city has published, and none stood 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 45 West 21st Street?
No space at 45 West 21st 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.
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Transit hubs in Flatiron
- R W at 23 St
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- F M at 23 St