Suffolk County and Islip Town property record for 40 William Ave, Central Islip, NY 11722
| Property Type | Single Family Home |
|---|---|
| Details | 1,270 sqft · built 1949 |
| Lot Size | 0.32 acres (13,939 sqft) |
| Owner | 2 Individual Names on Record |
| Last Sale | $528,940 (Jul 2023) |
| Tax Bill | $10,700 (2024) |
| Deeds & Mortgages | May 2021 Refinance Jul 2023 Sale & Mortgage + 2 more |
| Flood Zone | Zone X (minimal risk) |
| APN | 472889 99.-1-27 |
| Primary APN | 472889 99.-1-27 |
|---|---|
| Alternative APNs |
|
| Building Area | 1,270 sqft Living Area |
|---|---|
| 1st Floor Area | 870 sqft |
| Year Built | Built 1949 |
|---|---|
| Effective Year Built | Effective 1949 |
| Lot Area | 13,939 sqft (0.32 acres) |
| Lot Width | 80 ft Width |
| Garage Type | Detached |
| Garage Area | 280 sqft |
| Account Number | 369430 |
|---|---|
| Street Address | 40 WILLIAM AVE |
| City | CENTRAL ISLIP |
| State | NY |
| Zip | 11722-2335 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | B |
| Legal Description | X2221997Y208509 T012H00000000 |
| Legal Subdivision | ISLIP EATATES |
| Legal Block | 9000 |
| Legal Lot Number | 100 |
| Jurisdiction | SUFFOLK NY |
| Township / Civil Division | ISLIP |
| Census Block Group | 2 |
| Census Block | 2007 |
| Census Tract | 145706 |
Source: Suffolk County and Islip Town records, as of October 21, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Individual Names on Record |
|---|---|
| Mailing Address | 40 WILLIAM AVE, CENTRAL ISLIP, NY 11722-2335 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Date | Document |
|---|---|
| May 20, 2021 | Deed of Trust, Mortgage · Stand-Alone Refinance TEACHERS FCU |
| Jul 27, 2023 | Deed, Transfer · FHA Mortgage NATIONWIDE MORTGAGE BANKERS |
| Dec 7, 2020 | Deed, Transfer |
| Apr 13, 2017 | Grant Deed, Transfer EAGLE ABSTRACT CORPORATION, EAGLE ABSTRACT CORP |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Jul 27, 2023 · Amount on Record |
| Deed Sale | Jul 27, 2023 · Amount on Record |
| Prior Sale | Apr 13, 2017 · Amount on Record |
| Deed Book / Page | 13211 / 366 |
| Prior Transfer Date | Oct 13, 2020 |
| Prior Transfer Doc | 0130810138 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SUFFOLK NY |
| Property Address | 40 WILLIAM AVE, CENTRAL ISLIP, NY 11722-2335 |
| Transaction Type | Mortgage |
| Record Updated | Feb 27, 2024 |
| Name | Verified Name |
|---|---|
| Investor | Possibly a Property Investor |
| Document Number | 0232770724 |
|---|---|
| Date | May 20, 2021 |
| Book Page | 23277/724 |
| Instrument | DM011936 |
| Name | TEACHERS FCU |
|---|---|
| Type | Credit Union |
| Type | Stand-Alone Refinance |
|---|---|
| Amount | Amount Recorded |
| Document Type | Deed |
|---|---|
| Jurisdiction | SUFFOLK NY |
| Recording Date | Jul 27, 2023 |
| Property Address | 40 WILLIAM AVE, CENTRAL ISLIP, NY 11722-2335 |
| Document Number | 0132110366 |
| Book / Page | 13211 / 366 |
| Instrument Date | Apr 14, 2023 |
| Transaction Type | Transfer |
| Record Updated | Feb 27, 2024 |
| Amount | Amount Recorded |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $0.00 |
| Amount Accuracy | Full Amount Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 312 WICKS RD, BRENTWOOD, NY 11717-1131 |
| Document Number | 0002352325 |
|---|---|
| Date | Jul 27, 2023 |
| Instrument | 23523/25 |
| Name | NATIONWIDE MORTGAGE BANKERS |
|---|
| Type | FHA Mortgage |
|---|---|
| Amount | Amount Recorded |
| Document Type | Deed |
|---|---|
| Jurisdiction | SUFFOLK NY |
| Recording Date | Dec 7, 2020 |
| Property Address | 40 WILLIAM AVE, CENTRAL ISLIP, NY 11722-2335 |
| Document Number | 0130810138 |
| Book / Page | 13081 / 138 |
| Instrument Date | Oct 13, 2020 |
| Transaction Type | Transfer |
| Record Updated | Aug 20, 2021 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | No Consideration Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | SUFFOLK NY |
| Recording Date | Apr 13, 2017 |
| Property Address | 40 WILLIAM AVE, CENTRAL ISLIP, NY 11722-2335 |
| Document Number | 0129080467 |
| Book / Page | 012908 / 000467 |
| Instrument Date | Apr 13, 2017 |
| Transaction Type | Transfer |
| Record Updated | Aug 29, 2017 |
| Title Company | EAGLE ABSTRACT CORPORATION, EAGLE ABSTRACT CORP |
| Amount | Amount Recorded |
|---|---|
| Tax | $972.00 |
| Amount Accuracy | Confirmed |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 40 WILLIAM AVE CENTRAL ISLIP NY 117222335, CENTRAL ISLIP, NY 11722-2335 |
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 | $33,700 (-) Land $6,900 Building $26,800 | $474,648 (-) Land $97,183 Building $377,465 | |
| 2024 | $10,700.00 | $474,648 (+2.54%) Land $97,183 Building $377,465 | |
| 2023 | $33,700 Land $6,900 Building $26,800 | $462,912 Land $94,780 Building $368,132 |
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.
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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 99.1% of the US · lower than 99.2% 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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