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434 Union Street #B, Brooklyn, NY 11231 Property Information

434 Union Street #B, Brooklyn, NY 11231 Property Information

  • General
  • Owner
  • Documents
  • Tax
  • Permits
  • Neighborhood
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434 Union Street #B, Brooklyn, NY 11231
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Address

Primary address 434 Union Street #B
Neighborhood Gowanus
Zip code 11231
Borough Brooklyn
Block & lot 00437-1002

Sales & Tax Overview for 434 Union Street #B, Brooklyn

View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.

Purchase date 08/12/2021
Purchase price $1,290,000
Tax class
Estimated property tax $9,185

Lot & Building Information for 434 Union Street #B, Brooklyn

Lot sqft 2,033
Lot dimensions 20.33 ft x 100 ft
Building class Condo - Residential Unit in 1-3 Story Building (R3) i
Building sqft 913
Building dimensions 20 ft x 40 ft
Buildings on lot 1
Stories 3
Structure type Walk-up apartment
Year built 1920
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Zoning & Use for 434 Union Street #B, Brooklyn

Residential units (DOF) 1

Area Overview

Walk Score
97 /100. Walker's Paradise
Transit Score
100 /100. Rider's Paradise
Bike Score
95 /100. Biker's Paradise

School district 15
Community district 6

View more neighborhood information such as transportation, nearby schools and risk designations in the dedicated tab.

Unit Overview

Unit # B

Other Property Data for 434 Union Street #B, Brooklyn

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Floor area ratio (FAR) for 434 Union Street #B, Brooklyn, NY 11231, including commercial and residential FAR, FAR as built and usable floor area.
Development maps such as planimetric, zoning, urban landscape, and HPD alternative enforcement program maps.
Violations for 434 Union Street #B, Brooklyn, NY 11231, including DOB violations, ECB violations, HPD violations and 311 complaints.

About 434 Union Street #B, Brooklyn

What is the year built & the total sq. ft. for 434 Union Street #B, Brooklyn, NY 11231?

434 Union Street #B, Brooklyn, NY 11231 was built in 1920 and has a total of 913 square feet.

What is the assessed value of 434 Union Street #B, Brooklyn, NY 11231 and the property tax paid?

Assessed at $130,723, the tax amount paid for 434 Union Street #B, Brooklyn, NY 11231 is $9,116. For the next year, the tax amount for 434 Union Street #B, Brooklyn, NY 11231 is estimated at $9,185.

When was 434 Union Street #B, Brooklyn, NY 11231 last sold and what was the last sale price?

434 Union Street #B, Brooklyn, NY 11231 was last sold in 08/12/2021 for $1,290,000.

How many residential units does this building have?

This building has 1 residential unit(s).

Ownership Information for 434 Union Street #B, Brooklyn

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Property owner name for 434 Union Street #B, Brooklyn, NY 11231
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Building contacts for 434 Union Street #B, Brooklyn, NY 11231
Building management:
Representatives (from permits):
Tenants:
Real Estate Reports:
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Prices continued to rise across most of the 50 priciest New York City neighborhoods in 2025, with increases of up to 39% year-over-year. Hudson Yards remained the most expensive NYC neighborhood for the seventh consecutive year, despite its median sale price dropping.
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Past Sales & Property History for 434 Union Street #B, Brooklyn

Create a free account to view the complete sales history for 434 Union Street #B, Brooklyn, including title documents, transfer conditions, mortgages, liens, and pre-foreclosures.

Purchase date Purchase price Buyer name Seller name
08/12/2021 $1,290,000

Title Documents for 434 Union Street #B, Brooklyn

To view the complete history of deeds, mortgages, assignments of leases and rents, and more, sign up for free. Available data goes back to 1966.

Date Type Amount Party 1 Party 2 Doc image
10/27/2021 - D
11/23/2021 - R		 Partial Release of Mortgage
(2021111600350001)
08/12/2021 - D
08/23/2021 - R		 Power of Attorney
(2021081900416003)
08/12/2021 - D
08/23/2021 - R		 Mortgage
(2021081900416002)
08/12/2021 - D
08/23/2021 - R		 Deed
(2021081900416001)
06/25/2021 - D
07/02/2021 - R		 Maps
(2021062801426002)
03/29/2021 - D
07/02/2021 - R		 Condo Declaration
(2021062801426001)
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R: Recorded date
D: Document date

Property Taxes for 434 Union Street #B, Brooklyn

Access detailed property tax data for 434 Union Street #B, Brooklyn, NY 11231. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.

Tax year: 2025-2026
Property tax: $9,117
Estimated property tax: $9,185
Tax assessor's market value: $2,178,720
Assessed value: $130,723

More about New York City Property Taxes

Assessment History for 434 Union Street #B, Brooklyn

Here's the assessment & property tax history for 434 Union Street #B, Brooklyn, including the evolution of the total tax rate and corresponding property tax.

Year Market value Assessed value Taxable Tax rate % Base tax Property tax Year over year change
2025/26 $2,178,720 $130,723 $45,945 19.843% $9,117 $9,117 +4.72%
2024/25 $2,563,200 $153,792 $43,344 20.085% $8,706 $8,706 +6.00%
2023/24 $3,145,200 $188,712 $40,891 20.085% $8,213 $8,213 +4.83%
2022/23 $2,899,800 $173,988 $38,576 20.309% $7,834 $7,834 n/a
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Permits for 434 Union Street #B, Brooklyn

The complete history of permits filed for 434 Union Street #B, Brooklyn, including new construction or demolition permits, plus any work pertaining to plumbing, heating and sprinkler systems is available with a free account. Available data goes back to 1990.

No recorded permits for this property.

Gowanus Residential Market Stats

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

Median Sale Price
$1,051,223
-47.4% YoY
Median Price/Sqft
$1,195
-22.5% YoY
Brooklyn Median Sale Price
$839,000
6.2% YoY

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

Transportation

Distance to Subway
Closest station Smith St & President St at NE Corner
Station lines F-G
Distance (miles) 0.217
View subway map

Schools

Nearest elementary schools

Name Rating Att. zoned Type Grade range No of students Distance to school (mi)
P.S. 32 Samuels Mills Sprole 6 No Public PK, K-5 452 0.06
P.S. 32 Samuels Mills Sprole 6 No Public PK, K-5 452 0.06
Hannah Senesh Community Day School NR No Private K-8 231 0.28
P.S. 58 The Carroll 8 No Public PK, K-5 751 0.28
P.S. 58 The Carroll 8 No Public PK, K-5 751 0.28
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Nearest middle schools

Name Rating Att. zoned Type Grade range No of students Distance to school (mi)
Hannah Senesh Community Day School NR No Private K-8 231 0.28
P.S. 372 The Children S School NR No Public PK, K-8 436 0.34
School For International Studies 5 No Public 6-12 782 0.39
Al-Madinah School NR No Private PK-12 790 0.40
International School of Brooklyn NR No Private PK, K-8 0 0.48
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Nearest high schools

Name Rating Att. zoned Type Grade range No of students Distance to school (mi)
New Dawn Charter High School 2 No Charter 9-12 233 0.21
Cobble Hill School of American Studies 1 No Public 9-12 316 0.34
Digital Arts and Cinema Technology High School 8 No Public 9-12 331 0.39
School For International Studies 5 No Public 6-12 782 0.39
Al-Madinah School NR No Private PK-12 790 0.40
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Data provided by GreatSchools.org © 2025. All rights reserved.

Neighbors for 434 Union Street #B, Brooklyn

Here are the neighbors for 434 Union Street #B, Brooklyn, NY 11231.

Address Square feet Purchase date Purchase price
822 Flatbush Ave, Brooklyn 23,502
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