Self-storage building · Chelsea, Manhattan
510 West 21st Street
New York, NY 10011
510 West 21st Street is an 8-floor self-storage building in Chelsea, Manhattan, built in 1928, with about 123,000 square feet of industrial and storage space according to city records.
Also at 510-520 West 21st Street.
- Industrial and storage space
- 123K SF
- Floors
- 8
- Year built
- 1928
- Zoning
- M1-5
The 2nd largest of the 3 industrial and storage buildings we track in Chelsea. Compare it with 6 neighbors
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Compared with its neighbors
How 510 West 21st Street compares
Next to the 6 nearest large industrial and storage buildings, all within a 15 minute walk, 510 West 21st Street ranks 5th of 7 by industrial and storage floor area. It went up in 1928; the median neighbor dates from 1915. Its estimated property tax, about $6.99 a square foot of floor area before abatements, is below the neighbors' median of $7.91.
| Building | Industrial and storage space | Floors | Built | Tax / SF | Last sale |
|---|---|---|---|---|---|
| 510 West 21st Street | 123K SF | 8 | 1928 | $6.99 | Dec 2021, $95.2M |
| 525 West 20th Street | 95K SF | 9 | 1913 | $5.09 | n/a |
| 524 West 23rd Street | 128K SF | 10 | 1931 | $7.57 | Dec 2021, $132M |
| 99 Tenth Avenue | 189K SF | 11 | 1917 | $9.97 | n/a |
| 510 West 27th Street | 40K SF | 6 | 1910 | $8.02 | n/a |
| 302 Eleventh Avenue | 213K SF | 9 | 1913 | $7.79 | Dec 2021, $234M |
| 155 West 29th Street | 140K SF | 17 | 2022 | $10.32 | 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 35,000 SF of the building's main use. Walking times are straight-line estimates.
NYC tax lot records
Building facts
- Other address
- 510-520 West 21st Street
- ZIP code
- 10011
- Building type
- Self-storage building (city class E7)
- Total floor area
- 124,385 SF
- Commercial floor area
- 124,385 SF
- Retail
- 1,380 SF
- Industrial and storage
- 123,005 SF
- Height
- 8 floors
- Average floor
- About 15,500 SF (floor area divided by floors)
- Year built
- 1928
- Last major alteration
- 1988
- Lot area
- 13,800 SF
- Zoning district
- M1-5
- Built FAR
- 9.01
- Max commercial FAR
- 5
- Tax lot (BBL)
- 1006920041
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 Department of Finance records
Owner, property tax and assessed value
The Department of Finance lists SM I MMS, L.L.C. as the owner of record. For tax year 2026/27 the city values 510 West 21st Street at $25 million and assesses it at $11.2 million. After phase-ins and exemptions its taxable value is $8.01 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 $869,432 a year before abatements, roughly $6.99 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
- SM I MMS, L.L.C.
- Tax class
- Class 4 (commercial and industrial)
- City market value
- $24,959,000
- Land market value
- $2,700,000
- Assessed value
- $11,231,550
- Taxable value (phased in)
- $8,014,680
- Estimated yearly tax
- About $869,432
- Tax per SF of floor area
- About $6.99
City market value by tax year
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How to find who owns any NYC buildingSource: 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 2026-10-16; 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 property records (ACRIS)
Sales history
510 West 21st Street last sold in December 2021 for $95.2 million, according to the deed recorded with the city. WEST 21ST STREET PROPERTIES, LLC sold it to SM I MMS, L.L.C.. That comes to about $765 per square foot of floor area.
- Last sale (deed date)
- December 16, 2021
- Price
- $95,200,000
- Price per SF of floor area
- About $765
- Seller
- WEST 21ST STREET PROPERTIES, LLC
- Buyer
- SM I MMS, L.L.C.
- Deed recorded
- December 29, 2021
- ACRIS document
- 2021121700645020
Recorded sales
Source: NYC Department of Finance, ACRIS, Real Property Master, Legals and Parties, pulled 2026-10-16; prices as the deeds state them, names as recorded (companies and public bodies only). Shown are deeds that move the whole lot for a real price. Transfers between related companies for a nominal sum, sales of partial interests, land sales before the building went up and sales of the company that owns a building are left out.
NYC energy benchmarking (Local Law 84)
Energy use and emissions
510 West 21st Street's 2024 Local Law 84 benchmarking filing got no ENERGY STAR score (no single use that ENERGY STAR scores covers more than half of the floor area), and Local Law 33 letter grades come from that score, so the filing does not yield an A to D grade. Its site energy use came to 15.1 kBtu per square foot, less than half the national median of 38.4 for a similar property. Its greenhouse gas emissions were about 150 metric tons of CO2e (1.2 kg per square foot).
- ENERGY STAR score (2024)
- None given
- Property type (Portfolio Manager)
- Self-Storage Facility
- Site energy use intensity
- 15.1 kBtu/SF
- National median for the type
- 38.4 kBtu/SF
- Greenhouse gas emissions
- 150 t CO2e
- Emissions per SF
- 1.2 kg CO2e
- Floor area in the filing
- 124,386 SF
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 2026-10-16; grade cutoffs from the Department of Buildings energy grades page. Figures are as the owner filed them in ENERGY STAR Portfolio Manager.
Local Law 97 of 2019, estimated
Local Law 97 emissions limit
At its 2024 energy use, 510 West 21st Street comes to about 142 metric tons of CO2e a year under Local Law 97's coefficients, against a limit of 530 tons for 2024 to 2029 (27% of the limit), so it would owe no penalty. From 2030 the limit drops to 76 tons and the same energy use counts as about 131 tons, about 55 tons over, or an estimated $15,000 a year unless the building cuts its emissions.
- Period
- 2024 to 2029
- Emissions limit
- 530 t CO2e
- Estimated emissions
- 142 t CO2e
- Under the limit by
- 388 t CO2e
- Estimated penalty a year
- None
- Period
- 2030 to 2034
- Emissions limit
- 76 t CO2e
- Estimated emissions
- 131 t CO2e
- Over the limit by
- 55 t CO2e
- Estimated penalty a year
- $15,000
Estimated from the owner's 2024 Local Law 84 filing, which reports energy by source and floor area by use: Self-Storage Facility 124,386 SF. It applies the coefficients and per-use limits in Department of Buildings rule 1 RCNY 103-14 and Administrative Code 28-320.3.1.1 (as the Department lists them) and the $268 per ton penalty, checked 2026-10-04. It is not the building's Local Law 97 report: that report can count renewable energy credits, solar and storage deductions and, for 2024 and 2025, the law's occupancy group limits where higher, and penalties can be reduced for good faith efforts.
Change these numbers in the Local Law 97 calculator to see what a cut in energy use would do to the penalty.
How Local Law 97 works: who is covered, the 2030 limits and what owners, tenants and buyers should check.
Own or manage 510 West 21st Street? List a space here free and we match it against every active requirement.
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 2 jobs at 510 West 21st Street. A sidewalk shed permit here is active until November 22, 2026.
- New jobs, last 12 months
- 2
- Initial permits, last 12 months
- 2
- Newest job first permitted
- August 2026
- Interior build-outs, last 24 months
- 0
- Facade and sidewalk jobs, last 24 months
- 2
- Sidewalk shed permit
- Active until Nov 22, 2026
New jobs by year
Build-outs across ChelseaWhere 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.
No industrial and storage space listed in Chelsea yet
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Questions about 510 West 21st Street
How big is 510 West 21st Street?
510 West 21st Street has about 124,000 square feet of floor area in total, including 1,000 square feet of retail and 123,000 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.
When was 510 West 21st Street built?
City records list 1928 as the year built, with a major alteration recorded in 1988. The building is 8 floors tall.
What other addresses does 510 West 21st Street have?
City records list 510-520 West 21st Street on the same tax lot (BBL 1006920041) as 510 West 21st Street. A space listed on Leasemark at any of these addresses shows up on this page.
What is the ZIP code of 510 West 21st Street?
510 West 21st Street is in ZIP code 10011, according to the city's tax lot records (NYC PLUTO 26v2) and the Department of Finance's assessment roll. The full mailing address is 510 West 21st Street, New York, NY 10011, in Chelsea.
What is the zoning at 510 West 21st Street?
The lot is in the M1-5 zoning district. PLUTO lists a built floor area ratio (FAR) of 9.01 and a maximum commercial FAR of 5 for this lot.
What subway station is closest to 510 West 21st Street?
The closest subway station to 510 West 21st Street is 23 St (the C and E trains), about 0.4 miles away in a straight line, roughly 9 minutes on foot. Also nearby: 14 St (the A, C, E and L trains, connected to 8 Av), 9 min walk; 23 St (the 1 train), 12 min walk. Walking times are straight-line estimates; the street route is longer.
Who owns 510 West 21st Street?
The NYC Department of Finance's 2026/27 assessment roll lists SM I MMS, L.L.C. as the owner of record of 510 West 21st Street (BBL 1006920041). 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.
When was 510 West 21st Street last sold?
510 West 21st Street last sold in December 2021 for $95.2 million, according to the deed recorded with the city. WEST 21ST STREET PROPERTIES, LLC sold it to SM I MMS, L.L.C.. That comes to about $765 per square foot of floor area. The deed is ACRIS document 2021121700645020 (BBL 1006920041) 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.
Does 510 West 21st Street have an energy grade?
510 West 21st Street's 2024 Local Law 84 benchmarking filing got no ENERGY STAR score (no single use that ENERGY STAR scores covers more than half of the floor area), and Local Law 33 letter grades come from that score, so the filing does not yield an A to D grade. Its site energy use came to 15.1 kBtu per square foot, less than half the national median of 38.4 for a similar property. Its greenhouse gas emissions were about 150 metric tons of CO2e (1.2 kg per square foot).
Does 510 West 21st Street meet Local Law 97?
At its 2024 energy use, 510 West 21st Street comes to about 142 metric tons of CO2e a year under Local Law 97's coefficients, against a limit of 530 tons for 2024 to 2029 (27% of the limit), so it would owe no penalty. From 2030 the limit drops to 76 tons and the same energy use counts as about 131 tons, about 55 tons over, or an estimated $15,000 a year unless the building cuts its emissions. 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.
Is there construction at 510 West 21st Street?
In the 12 months to October 2026, the Department of Buildings issued first permits for 2 jobs at 510 West 21st Street. A sidewalk shed permit here is active until November 22, 2026. These are the Department of Buildings' DOB NOW work permits for tax lot 1006920041. 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 510 West 21st Street?
The Department of Finance's 2026/27 assessment roll lists a taxable value of $8.01 million for 510 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 $869,432 a year, roughly $6.99 per square foot of floor area, before abatements such as ICAP. The city's property tax records for BBL 1006920041 show the actual bill.
What is the assessed value of 510 West 21st Street?
For tax year 2026/27, the NYC Department of Finance puts the market value of 510 West 21st Street at $25 million ($2.7 million of it land) and its assessed value at $11.2 million, the 45% of market value the city assesses for Class 4 property. The city's market value rose 77% from 2022/23 ($14.1 million) to 2026/27.
Is there industrial and storage space for lease at 510 West 21st Street?
No space at 510 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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