What is the property tax for 423 Union Street?

The estimated annual property tax for 423 Union Street is $6,977 (2027, excluding special districts), computed from taxable values and published rates.

NY Property Records

423 Union Street
Brooklyn · Kings County · 11231

Q: Who owns 423 Union Street?

423 Union Street is owned by Kosman Isaac per the 2025 NYS assessment roll.

01 · 1–2 FamilyLast sold May 1999 · click to view deed ↗

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Owner of record

OwnerKosman Isaac

Assessment · 2025 roll

Land assessed$36,420

Total assessed$157,020

Est. annual tax$6,977 (2027, excl. special districts)

Building

StyleBrick

Year built1899

Living area1,520 sq ft

Lot

Size0.05 acres (GIS)

Frontage × depth20 × 100 ft

Lot sq ft2,000

Zoning

DistrictR6B

FAR1.14 built · 2.0 max residential · 2.0 max facility

Zoning map16c

Recorded documents · 17

SATISFACTION OF MORTGAGE Apr 22, 2026

mortgager/borrower Kosman, Isaac; Poisson, Catherine

mortgagee/lender M&T Bank; People'S United Bank, N.A

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MORTGAGE $200,000 Jun 4, 2021

mortgagor/borrower Kosman, Issac; Poisson, Catherine

mortgagee/lender People'S United Bank

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SATISFACTION OF MORTGAGE Feb 28, 2017

mortgager/borrower Kosman, Isaac; Poisson, Catherine

mortgagee/lender Norwest Mortgage Of New York, Inc.

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Show all 17

MORTGAGE $300,000 Jan 11, 2008

mortgagor/borrower Kosman, Isaac; Poisson, Catherine

mortgagee/lender Jp Morgan Chase Bank Na

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AGREEMENT $300,000 Jan 13, 2004

party 1 Kosman, Isaac; Poisson, Catherine

party 2 Wells Fargo Home Mortgage Inc

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MORTGAGE $7,160 Jan 13, 2004

mortgagor/borrower Kosman, Isaac; Poisson, Catherine

mortgagee/lender Wells Fargo Home Mortgage Inc

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ASSIGNMENT, MORTGAGE Feb 21, 2002

assignor/old lender Norwest Mortgage; Norwest Mortgage Ofnew York Inc

assignee/new lender Norwest Mortgage Inc; Wells Fargo Home Mortgage Inc

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DEED Sep 21, 1999

grantor/seller Pimentel, Nydia M

grantee/buyer Kosman, Isaac; Poisson, Catherine

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POWER OF ATTORNEY Sep 21, 1999

party one Poisson, Catherine

party two Kosman, Isaac

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MORTGAGE $307,100 Sep 21, 1999

mortgagor/borrower Kosman, Isaac; Poisson, Catherine

mortgagee/lender Norwest Mortgage Ofnew York Inc

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DEED Apr 1, 1996

grantor/seller Castro, Daisy; Mattern, Daisy +5

grantee/buyer Pimentel, Nydia M

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POWER OF ATTORNEY Apr 1, 1996

party one Perez, Hector

party two Mattern, Daisy

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POWER OF ATTORNEY Apr 1, 1996

party one Perez, Jose A

party two Mattern, Daisy

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MORTGAGE $115,000 Apr 1, 1996

mortgagor/borrower Pimentel, Nydia M

mortgagee/lender Home Federal Savingsbank

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DEED Mar 31, 1987

grantor/seller Reyes, Manuel A

grantee/buyer Castro, Doris; Mattern, Daisy +4

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POWER OF ATTORNEY Sep 6, 1977

party one Reyes Herminio

party two Pimentel Nydia

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DEED Sep 6, 1977

grantor/seller Reyes Herminio; Reyes Manuela

grantee/buyer Reyes Manuela

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No DOB violations, HPD violations, or complaints on file.

Deed & identifiers

SBL3004300074

SWIS610100

Parcel ID6101003004300074

Who owns 423 Union Street?

423 Union Street, Brooklyn is owned by Kosman Isaac per the 2025 NYS assessment roll.

Nearby on Union Street

425 Union Street · 421 Union Street · 419 Union Street · 427 Union Street · 429 Union Street · 417 Union Street · 431 Union Street · 415 Union Street · 433 Union Street · 413 Union Street

Public record, NYS tax roll 2025. Values are the assessor's, not an appraisal. Provided for informational purposes only — accuracy and completeness are not warranted or guaranteed; verify against official sources before relying on it. Disclaimer · Request redaction

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