What the listing does not show
21 South William Street #4
in 21 South William StreetManhattan, NY 10004CondominiumModerate risk
Listed at $888,000. The listing does not mention what city records show: 4 open building violations. Read them before you offer, and be ready to explain them if you are selling.
- Asking
- $888,000
- Beds
- 1 bed
- Baths
- 1 bath
- Size
- 738 ft²
- Building
- Condominium
- Built
- 1928
- Open housing violations
- 0
- Immediately hazardous
- 0
- Open building violations
- 4
- Unresolved penalties
- 0
01 / Findings
What to ask about
City records a buyer can raise and a seller should be ready to explain. A reading of open filings, not a forecast.
- 01Checked: no open housing violations on file.
- 024 open Buildings Department violations, which can slow a closing.
- 03Checked: no unresolved penalties on file.
- 04In the Stone Street Historic District, so exterior changes are restricted.
- 05Inside a FEMA 100-year flood zone, which can change insurance and what a lender will accept.
02 / Building
The building
City records for 21 South William Street, the building this listing is in. Department of Finance class RM: Condominium.
- Type
- Condominium
- Year built
- 1928Alterations: 2005, 2005
- Floors
- 8
- Units
- 3231 residential
- Building area
- 23,980 ft²
- Residential / commercial
- 20,019 / 3,961 ft²
- Lot
- 4,377 ft²51.08 × 83.98 ft
- Assessed value
- $3,065,409Tax assessment, not market value
- Assessed land
- $405,007
- Tax exemption
- $21,298
04 / Checked
What was checked
A zero means the file exists and is clear. A dash means the city has no file for this address, which is not the same thing.
Housing (HPD)
0
open violations
No open housing violations on file.
Registration recently lapsed, ended Sep 1, 2026. Owner state NY.
Buildings (DOB)
4
open violations
1 safety-related. Most recent open filing Dec 13, 2024.
Permits, unsafe structures, boilers, elevators, facades.
Penalties (ECB)
0
unresolved
No unresolved penalties on file.
05 / Full report
Not on the listing
How many documents and sales the city has on file for this building.
Condominium sales are recorded unit by unit, so deeds and mortgages are not combined for the whole building.
Same building
Other listings at 21 South William Street
06 / FAQ
Questions
How many open violations does 21 South William Street #4 have?
As of Oct 6, 2026, the building at 21 South William Street has 0 open HPD violations (0 Class C, 0 Class B, 0 Class A, 0 Class I), 4 open DOB violations, 0 unresolved ECB penalties. These are building records, so they apply to this listing.
Is this property in a flood zone?
Yes. The lot falls inside a FEMA 100-year flood zone on at least one of the 2007 or 2015 maps, which can affect insurance cost and lender requirements.
Where does this data come from?
Records are combined from NYC DCP PLUTO (tax lot, zoning, FAR); NYC HPD (housing violations and registrations); NYC DOB and ECB (building violations and penalties); NYC ACRIS (recorded deeds, mortgages and satisfactions); Active for-sale listings. PLUTO version 26v2.
Sources
NYC DCP PLUTO (tax lot, zoning, FAR) · NYC HPD (housing violations and registrations) · NYC DOB and ECB (building violations and penalties) · NYC ACRIS (recorded deeds, mortgages and satisfactions) · Active for-sale listings
PLUTO 26v2, refreshed Oct 6, 2026. Written for people buying or selling this property. Not legal, tax, or appraisal advice. Confirm the details with the city before you offer or list.