Suffolk County and Islip Town property record for 66 William Ave, Central Islip, NY 11722
| Property Type | Duplex |
|---|---|
| Details | 1,821 sqft · built 1957 |
| Lot Size | 0.2 acres (8,712 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $281,000 (Oct 2017) |
| Tax Bill | $11,535 (2024) |
| Deeds & Mortgages | Oct 2017 Sale |
| Flood Zone | Zone X (minimal risk) |
| APN | 472889 99.-1-57 |
| Primary APN | 472889 99.-1-57 |
|---|---|
| Alternative APNs |
|
| Units | 2 Units |
|---|---|
| Building Area | 1,821 sqft Living Area |
| 1st Floor Area | 915 sqft |
| Year Built | Built 1957 |
|---|---|
| Effective Year Built | Effective 1957 |
| Architectural Style | Duplex Single |
| Lot Area | 8,712 sqft (0.2 acres) |
| Lot Width | 119 ft Width |
| Garage Type | Attached |
| Garage Area | 616 sqft |
| Account Number | 369360 |
|---|---|
| Street Address | 66 WILLIAM AVE |
| City | CENTRAL ISLIP |
| State | NY |
| Zip | 11722-2336 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Local Zoning Code | B |
| Legal Description | X2222385Y208655 T012H00000000 |
| Legal Subdivision | MAP ISLIP ESTATES |
| Legal Block | 9000 |
| Legal Lot Number | 100 |
| Jurisdiction | SUFFOLK NY |
| Township / Civil Division | ISLIP |
| Census Block Group | 2 |
| Census Block | 2008 |
| Census Tract | 145706 |
66 William Ave, a duplex, is owned and occupied by two individuals who bought it in October 2017.
Source: Suffolk County and Islip Town records, as of August 11, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 66 WILLIAM AVE, CENTRAL ISLIP, NY 11722-2336 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Oct 31, 2017 · Amount on File |
| Deed Sale | Oct 31, 2017 · Amount on File |
| Prior Sale | Jul 25, 2014 · Amount on File |
| Deed Document Number | 201717-0192398 |
| Deed Book / Page | 12935 / 932 |
| Prior Transfer Date | Jul 12, 2011 |
| Prior Transfer Doc | 0126680065 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed |
|---|---|
| Jurisdiction | SUFFOLK NY |
| Recording Date | Oct 31, 2017 |
| Property Address | 66 WILLIAM AVE, CENTRAL ISLIP, NY 11722-2336 |
| Document Number | 0129350932 |
| Book / Page | 12935 / 932 |
| Instrument Date | Sep 22, 2017 |
| Instrument | 0017-0192398 |
| Transaction Type | Transfer |
| Record Updated | Aug 20, 2021 |
| Amount | Amount on Record |
|---|---|
| Tax | $0.00 |
| Amount Accuracy | Full Amount Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Joint Tenants |
| Address | 17 DATE ST, CENTRAL ISLIP, NY 11722-4036 |
Source: Suffolk County and Islip Town assessment roll, as of August 11, 2026
| Type | Name |
|---|---|
| State | New York |
| County | Suffolk County |
| County Subdivision | Islip Town |
| Unified School District | Central Islip Union Free School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $35,550 Land $6,700 Building $28,850 | $500,704 (-) Land $94,366 Building $406,338 | |
| 2024 | $11,535.00 | $500,704 (+2.54%) Land $94,366 Building $406,338 | |
| 2023 | $35,550 Land $6,700 Building $28,850 | $488,324 Land $92,033 Building $396,291 |
Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.
FEMA maps place 66 William Ave in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective September 18, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 2 in force |
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
Wildfire risk around 66 William Ave is low, with less than a 0.01% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 97% of the US · lower than 96% of New York |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | None beyond ember reach |
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | SUFFOLK COUNTY WATER AUTHORITY serves 1,100,000 people · EPA ID NY5110526 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Jan 2024 |
| Lead | 1 ppb (2025–2027) action level 15 ppb |
| Water Quality | Asbestos resolved · Jul 2020 |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.
Source: FCC Broadband Data Collection, based on 512 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Optimum Fiber · Cable | 8,000 / 8,000 |
| Verizon Fiber · Fixed Wireless in parts of the area | 2,300 / 2,300 |
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