NY Property Records
40 William Ave
40 William Ave
Islip · Suffolk County
210 · ResidentialSold $528,940 · Apr 2023
Owner of record
OwnerPedro Alonso Castillo &
Mailing address40 WILLIAM AVE · CENTRAL ISLIP, NY, 11722
Assessment · 2025 roll
Land assessed$6,900
Total assessed$33,700
Est. annual tax$11,159 (2024, excl. special districts)
Lot
Size0.32 acres
Services & districts
School districtCentral Islip (472813)
Recorded sales · 4
Deed$528,940Apr 14, 2023
seller JUAN E DURAN MARTE
buyer DIANA M SAAVEDRA BALCAZAR
Liber 13211, page 366
Deedno price statedOct 13, 2020
seller JUAN DURAN
buyer JUAN E DURAN MARTE
Liber 13081, page 138
Deed$243,000Apr 13, 2017
Liber 12908, page 467
Show all 4
Deed$248,500Oct 27, 2016
seller LORAC HOMES LLC
buyer JOSE GUERRERO
Liber 12890, page 420
From NYS RP-5217 transfer reports. For the deed itself, use the liber and page at the county clerk.
Deed & identifiers
Deed book / page13211 / 366
SBL05000990001000270000
Print key99.-1-27
SWIS472889
Parcel ID47288905000990001000270000
Who owns 40 William Ave?
40 William Ave, Islip is owned by Pedro Alonso Castillo & per the 2025 NYS assessment roll. It last sold for $528,940 in Apr 2023.
Nearby on William 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
Search by name or address · Browse all records