NY Property Records
21 Prospect Ave
21 Prospect Ave
Islip · Suffolk County
210 · Residential
Owner of record
OwnerJohn Jr/Thao Thi Williams
Mailing address21 PROSPECT AVE · BRENTWOOD, NY, 11717
Assessment · 2025 roll
Land assessed$9,400
Total assessed$29,000
Est. annual tax$6,455 (2024, excl. special districts)
Lot
Size0.45 acres
Services & districts
School districtBrentwood (472812)
Deed & identifiers
SBL05000950001000710000
Print key95.-1-71
SWIS472889
Parcel ID47288905000950001000710000
Who owns 21 Prospect Ave?
21 Prospect Ave, Islip is owned by John Jr/Thao Thi Williams per the 2025 NYS assessment roll.
Nearby on Prospect Ave
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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