Last updated on Nov 8, 2025

Block Hall,
21 South William Street

This 7-story, Tudor-style building at 21-23 South William Street was converted to a residential condominium in 2005. It has 31 apartments and is known as Block Hall.

Recent Sales (4) $1,216 Avg. price/ft²
All Units in Building (31)

Apt. 2D

1 bed

1 bath

642 ft²

$872,000 -6.7%

$1,358

$935,000

Sep 22, 2023

Apt. 3D

1 bed

1 bath

745 ft²

$835,000 -4.6%

$1,121

$875,000

Jun 13, 2023

Apt. 6B

1 bed

1 bath

641 ft²

$710,000 -10.7%

$1,108

$795,000

Jan 17, 2023

Apt. 5D

1 bed

1 bath

686 ft²

$875,000

$1,276

$875,000

Jul 22, 2022

View Full Sales History

Overview of Block Hall at 21 South William Street

21 South William Street was built in 1927 and converted to condos in 2005. Block Hall has a total of 31 apartments and is located in the Financial District, very close to the J, Z, 1, 2, 3, R, 4 and 5 subway lines.

Amenities at this pre war building include fitness center, rooftop terrace, concierge and central ac.

Similar nearby buildings include 15 William Street, 25 Broad Street, 75 Wall Street and 88 Greenwich Street. See more ->

Doorman

None

Type

Condo

Year Built

1927

Converted: 2005

Apartments

31 (view all units)

Floors

Neighborhood

Financial District (Manhattan)

Min Down

20%

Maps &
3D Aerial Views

View school info, local attractions, transportation options & more.

Experience amazing 3D aerial maps and fly throughs.

Amenities

Concierge
Pre War
Central AC
Rooftop Terrace
Elevator
Fitness Center

Area Map StreetView

{ "key" : "AIzaSyDquABdSLhathmwfnoTcYwA1BY6coZZyZk", "lat": 40.70437, "lng": -74.01063, "marker": { "icon": "https://img3.cityrealty.com/neo/i/w/amenities/base.png" } }

at Nassau and Cedar 0.15 miles

at null and null 0.15 miles

at Broadway and Battery Pl 0.18 miles

at William and Cedar 0.19 miles

at William 0.41 miles

Sales History

View Full Closing History

Sales Summary

Show:

Sales History by Apartment Size

View Full Closing History

Show:

Pricing Comparison of Similar Buildings

View Detailed Comparison

Editorial Coverage

Alternate Addresses

21 s -23 william st
21 s william st
21 south william street
21-23 South William Street
2123 s william st
23 s william st
45 Stone Street
45-47 Stone Street
47 Stone Street

The Elisa

between Seventh Avenue & Eighth Avenue

Chelsea

An inimitable lifestyle cultivated by Isay Weinfeld. European elegance at the intersection of the West Village, Meatpacking, & Chelsea. Premium location | 1H 2024 occupancy

3 beds starting at $5,750,000
4 beds starting at $11,900,000

Learn More

RLS IDX Data display by CityRealty.com, LLC. This information is not verified for authenticity or accuracy and is not guaranteed and may not reflect all real estate activity in the market. ©2026 The Real Estate Board of New York, Inc., All rights reserved. IDX information is provided exclusively for consumers’ personal, non-commercial use and it may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.

All information furnished regarding property for sale, rental or financing is from sources deemed reliable, but no warranty or representation is made as to the accuracy thereof and same is submitted subject to errors, omissions, change of price, rental or other conditions, prior sale, lease or financing or withdrawal without notice. All dimensions are approximate. For exact dimensions, you must hire your own architect or engineer and for no listing shall the number of bedrooms listed be considered a legal conclusion.

All closed sales data has been provided by the New York City Department of Finance via the Automated City Register Information System (ACRIS). No warranty or representation is made as to the accuracy of any data provided by ACRIS or any other sources.

CityRealty is committed to ensuring digital accessibility for individuals with disabilities. We are continuously working to improve the accessibility of our web experience for everyone, and we welcome feedback and accommodation requests. If you wish to report an issue or seek an accommodation, please contact us at accessibility@cityrealty.com.

An equal housing opportunity

{"1":[40.775,-73.94,"East Side","_es"],"2":[40.79,-73.99,"West Side","_ws"],"11":[40.76,-73.98,"Midtown","_m"],"3":[40.736,-73.99,"Downtown","_d"],"13":[40.711309,-74.01,"Financial
District\/BPC","_fd"],"4":[40.682676,-73.973007,"Brooklyn","_b"],"12":[40.8444,-73.9376,"Upper Manhattan","_um"],"5":[40.7477089,-73.930411,"LIC \/ Queens","_qns"],"18":[40.8889782,-73.9025,"The Bronx","_bx"]}

Turn Favoritesinto Tours!

Block Hall,21 South William Street

Overview of Block Hall at 21 South William Street

Maps &3D Aerial Views

Amenities

Sales History

Sales Summary

Sales History by Apartment Size

Pricing Comparison of Similar Buildings

Editorial Coverage

Alternate Addresses

Buy & Sell

Rent

Buildings

Insights

Company

Turn Favorites
into Tours!

Block Hall,
21 South William Street

Maps &
3D Aerial Views