New York City  »  11231  »  Union St  »  421 Union St

421 Union Street, Brooklyn, NY 11231 - Property report

Also known as: 421 Union St

Property image for 421 Union Street, Brooklyn, NY 11231
static Mapbox map

Property type

Two Family Brick (B1)

Year built

1899

Lot sq. ft.

2,000

General information

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Address
Primary address
421 Union Street
ZIP code
11231
Neighborhood
Gowanus
Borough
Brooklyn
Block & lot
00430-0075

Owner

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Building
Property type
Two Family Brick (B1)
Building sq. ft.
2,289
Building dimensions
20 ft x 38 ft
Buildings on lot
1
Stories
2
Year built
1899
Last altered
2020
Building material
Brick
Exterior wall
Brick/Masonary
Basement
4
Tax
Tax year
2026-2027
Property tax
$11,109
Tax class
Floor area ratio (FAR)
Commercial FAR
Residential FAR
Buildable area
Zoning & Use
Zoning
Qualified opportunity zone
Residential units
2
Residential sq. ft.
Commercial units
0
Office sq. ft.
Retail sq. ft.
Lot
Frontage(s)
Union Street (narrow)
Nearest wide street
Hoyt Street
Distance to wide street
Lot dimensions
20 ft x 100 ft
Lot sq. ft.
2,000

Area overview

Walk score
99 /100.  Walker's Paradise
Transit score
100 /100.  Rider's Paradise
Bike score
97 /100.  Biker's Paradise
School district
15
Community district
6
Closest police station
0.50 Miles
Closest fire station
0.61 Miles

View more such as transportation, nearby schools and risk designations.

Ownership

Ownership information for 421 Union Street, Brooklyn, NY

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Property owner name
Registered owner
Source
Deed
Owner contact information
Phone number
Owner address
Documents

Sales history for 421 Union Street, Brooklyn, NY 11231

No recently recorded sales for this property.

More about New York City property records.

Title documents

Date Type Amount Party 1 Party 2
03/25/2020 - R
03/23/2020 - D		 Satisfaction of Mortgage
(2020032400804001)		 XXXXXX XXXX X XXXXXXXX XXXXXXXXXX XXXXXXXXXXXX XXXXXXX XXX
03/23/2020 - R
03/17/2020 - D		 Satisfaction of Mortgage
(2020032000282001)		 XXXXXX XXXX XXXXXXXX XX
03/26/2020 - R
03/04/2020 - D		 Mortgage
(2020032600143001)		 XXXXXX XXXX X XXXXXXX XXXXXXXX XXXX
07/13/2010 - R
07/07/2010 - D		 Satisfaction of Mortgage
(2010070701040001)		 XXXXXX XXXX X XXXXXXX XXXX X X X
07/15/2010 - R
06/30/2010 - D		 Mortgage
(2010071200584001)		 XXXXXX XXXX X XXXXXXXX XXXXXXXXXX XXXXXXXXXXXX XXXXXXX XXX
07/04/2004 - R
05/26/2004 - D		 Satisfaction of Mortgage
(2004052701232001)		 XXXXX XXXXXXXX XXXX
07/03/2004 - R
05/05/2004 - D		 Mortgage
(2004051802197001)		 XXXXXX XXXX X XXXXXXX XXXX
06/12/2003 - R
05/12/2003 - D		 Satisfaction of Mortgage
(2003052800216001)		 XXXXXXXX XXXXX X XX XXXX XXXX
06/28/2003 - R
03/13/2003 - D		 Mortgage
(2003042901665001)		 XXXXXX XXXX X XXXXX XXXXXXXX XXXX
12/23/2002 - R Mortgage
(3450009021945)		 XXXXXX XXXX X XXXXXXXX XX

*Most recent recorded documents on file for this property.

R: Recorded date
D: Document date

Tax

Property taxes for 421 Union Street, Brooklyn, NY

Property tax data includes tax amount, market value and assessed value, exemptions, abatements and assessment history.

Current property tax
Tax year
2025-2026
Property tax
$11,109
Municipal exemptions
Recent tax assessments
Market value
$3,402,000
Assessed value
$204,120

More about New York City property taxes

Assessment history

See the assessment and property tax history, including the evolution of the total tax rate and corresponding property tax amount.

Tax year Market value Assessed value Taxable amount Tax rate Base tax Property tax Y-o-Y change
2025/26 $3,210,000 $192,600 $55,373 19.843% $10,988 $10,988 +12.15%
2024/25 $3,133,000 $187,980 $48,781 20.085% $9,798 $9,798 +28.26%
2023/24 $2,829,000 $169,740 $38,034 20.085% $7,639 $7,639 +3.57%
2022/23 $2,514,000 $150,840 $36,317 20.309% $7,376 $7,376 +22.76%
2021/22 $2,427,000 $145,620 $30,097 19.963% $6,008 $6,008 -3.51%
2020/21 $2,943,000 $176,580 $29,588 21.045% $6,227 $6,227 +5.27%
2019/20 $2,939,000 $176,340 $27,945 21.167% $5,915 $5,915 +6.65%
2018/19 $2,740,000 $164,400 $26,512 20.919% $5,546 $5,546 +8.47%
2017/18 $2,268,000 $136,080 $25,081 20.385% $5,113 $5,113 +1.97%
2016/17 $2,114,000 $126,840 $25,081 19.991% $5,014 $5,014 +3.99%
Permits

Permit information for 421 Union Street, Brooklyn, NY

Filing date Job type Job status Job description Initial cost
10/24/2024 Alteration
09/19/2024 Alteration
09/19/2024 Alteration
07/05/2024 Alteration
05/17/2024 Alteration

*Most recent permits on record for this property.

More about New York City property records

Violations

HPD Violations

Violation ID Inspection date Class NOV issue date Status
11/24/2025 I
12/04/2024 I
11/28/2023 I

*Most recent HPD violations on record for this property.

Neighborhood

Carroll Gardens, Columbia, RedHook residential market stats

Access a detailed real estate market overview of Carroll Gardens, Columbia, RedHook so you can assess current trends, home values, types of properties sold and transaction volume. View the median home sale price in Carroll Gardens, Columbia, RedHook and compare it to other neighborhoods in Brooklyn.

Median sale price

—

Median price/sq. ft.

—

Brooklyn median sale price

$899,000

6% Y-o-Y

Check out recently sold homes in Brooklyn and see how their prices compare.

Risk

Create a free account to unlock expanded risk information, such as crime incidents in the area, tsunami and landslides risks, or its location relative to FEMA flood zones and the Coastal Barriers Resources System Area (COBRA).

FEMA flood zones

Property location map
FEMA flood zones
X

Hurricane evacuation zones

Property location map
Hurricane evacuation zones
2

Subway & traffic

Closest station
Smith St & President St at NE Corner
Station lines
F-G
Distance (miles)
0.155
View subway map

Access the detailed traffic volume map for 421 Union Street, Brooklyn, NY 11231 to see estimated average daily traffic on streets surrounding the property as well as the types of properties in its vicinity. View daily traffic map

Schools

Nearest elementary schools

Name Rating Att. zoned Type Grade range No of students Distance (miles)
P.S. 32 Samuels Mills Sprole 6 Yes Public PK, K-5 452 0.04
P.S. 32 Samuels Mills Sprole 6 Yes Public PK, K-5 452 0.04
P.S. 58 The Carroll 8 No Public PK, K-5 751 0.23
P.S. 58 The Carroll 8 No Public PK, K-5 751 0.23
Hannah Senesh Community Day School NR No Private K-8 231 0.24
Success Academy Cobble Hill 9 No Charter K-4 401 0.31
Pache Montessori NR No Private PK-K 122 0.31
Pache Montessori NR No Private PK-K 122 0.31
Rivendell School NR No Private PK-K 103 0.37
Rivendell School NR No Private PK-K 103 0.37
Nearest middle schools

Name Rating Att. zoned Type Grade range No of students Distance (miles)
Hannah Senesh Community Day School NR No Private K-8 231 0.24
School For International Studies 5 No Public 6-12 782 0.31
P.S. 372 The Children S School NR No Public PK, K-8 436 0.42
Mary McDowell Friends School NR No Private 6-10 290 0.45
International School of Brooklyn NR No Private PK, K-8 0 0.47
International School of Brooklyn NR No Private PK-8 369 0.47
Al-Madinah School NR No Private PK-12 790 0.47
Brooklyn Secondary School For Collaborative Studie 6 No Public 6-12 671 0.58
P.S. 369 Coy L Cox School NR No Public K-12 487 0.61
The Math And Science Exploratory School 7 No Public 6-8 522 0.61
Nearest high schools

Name Rating Att. zoned Type Grade range No of students Distance (miles)
New Dawn Charter High School 2 No Charter 9-12 233 0.16
Cobble Hill School of American Studies 1 No Public 9-12 316 0.28
School For International Studies 5 No Public 6-12 782 0.31
Digital Arts and Cinema Technology High School 8 No Public 9-12 331 0.31
Mary McDowell Friends School NR No Private 6-10 290 0.45
Al-Madinah School NR No Private PK-12 790 0.47
Brooklyn Secondary School For Collaborative Studie 6 No Public 6-12 671 0.58
P.S. 369 Coy L Cox School NR No Public K-12 487 0.61
Brooklyn High School of the Arts 5 No Public 9-12 927 0.61
Brooklyn Frontiers High School 3 No Public 9-12 145 0.64

Data provided by GreatSchools.org © 2026. All rights reserved.

Neighbors for 421 Union Street, Brooklyn, NY

415 Union St, Brooklyn 425 Union St, Brooklyn 431 Union St, Brooklyn 287 Bond St, Brooklyn 429 Union St, Brooklyn 433 Union St, Brooklyn 441 Union St, Brooklyn 419 Union St, Brooklyn 437 Union St, Brooklyn 423 Union St, Brooklyn 295 Bond St, Brooklyn 498 Sackett St, Brooklyn 427 Union St, Brooklyn 439 Union St, Brooklyn 417 Union St, Brooklyn 305 Bond St, Brooklyn 303 Bond St, Brooklyn 297 Bond St, Brooklyn 435 Union St, Brooklyn

Nearby ZIP codes for 421 Union Street, Brooklyn, NY

10002, New York City, NY 10004, New York City, NY 10005, New York City, NY 10006, New York City, NY 10007, New York City, NY 10038, New York City, NY 10271, New York City, NY 10278, New York City, NY 10279, New York City, NY 10280, New York City, NY 10282, New York City, NY 11201, New York City, NY 11205, New York City, NY 11215, New York City, NY 11217, New York City, NY 11218, New York City, NY 11219, New York City, NY 11220, New York City, NY 11232, New York City, NY 11238, New York City, NY

Frequently asked questions

What is the year built for 421 Union Street, Brooklyn, NY 11231?

The development at 421 Union Street, Brooklyn, NY 11231 was built in 1899.

What is the total square footage of 421 Union Street, Brooklyn, NY 11231?

421 Union Street, Brooklyn, NY 11231 has a total of 2,289 square feet.

What is the assessed value of 421 Union Street, Brooklyn, NY 11231?

421 Union Street, Brooklyn, NY 11231 is currently assessed at $204,120.

What are the property taxes for 421 Union Street, Brooklyn, NY 11231?

The property taxes for 421 Union Street, Brooklyn, NY 11231 total $11,108.

How many residential units does this building have?

This building has 2 residential unit(s).

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