Suffolk County and Islip Town property record for 16 William Ave, Islip, NY 11751 · Last verified August 2026
| Property Type | Residential > Multi-Unit > Duplex |
|---|---|
| Architecture Style | Duplex Single |
| Year Built | Built 1996 |
| Square Footage | 2,479 sqft Living Area |
| Lot Size | 11,326 sqft (0.26 acres) |
| Last Sale | $580,000 (2025) |
| Primary APN | 472889 319.-3-83.10 |
|---|---|
| Alternative APNs |
|
| Units | 2 Units |
|---|---|
| Building Area | 2,479 sqft Living Area |
| 1st Floor | 1,639 sqft 1st Floor |
| Year Built | Built 1996 |
|---|---|
| Effective Year Built | Effective 1996 |
| Architectural Style | Duplex Single Style |
| Lot Area | 11,326 sqft (0.26 acres) |
| Lot Width | 117 ft Width |
| Account Number | 034916 |
|---|---|
| Street Address | 16 WILLIAM AVE |
| City | ISLIP |
| State | NY |
| Zip | 11751-2716 |
| Property Usage | Residential Property Usage |
| Type | Residential > Multi-Unit > Duplex |
| Legal Description | T044H00000000 |
| Legal Block | 9000 |
| Legal Lot Number | 300 |
| Jurisdiction | SUFFOLK NY |
| Minor Civil Division | ISLIP |
| Census Blockgroup | 1 |
| Census Block | 1013 |
| Census Tract | 147401 |
Source: Suffolk County and Islip Town records · APN 472889 319.-3-83.10
Assessment roll updated August 11, 2026 · Last verified August 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 264 VANDERBILT AVE, BRENTWOOD, NY 11717-2521 |
| Owner Type | Owner is an Individual, Couple or Unincorporated Entity |
| Date | Document |
|---|---|
| Nov 15, 2023 | Warranty Deed, Transfer |
| Nov 18, 2021 | Deed of Trust, Mortgage · Stand Alone Refinance CITIBANK NA |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Sale | Jun 05, 2025 · Amount on Record |
| Deed Sale | Jun 05, 2025 · Amount on Record |
| Prior Sale | Aug 04, 1997 · Amount on Record |
| Deed Book / Page | 13297 / 303 |
| Prior Transfer Date | Oct 02, 2020 |
| Prior Transfer Doc | 0130850040 |
| Record Refreshed | Sep 20, 2026 |
| Document Type | Warranty Deed |
|---|---|
| Jurisdiction | SUFFOLK NY |
| Recording Date | Nov 15, 2023 |
| Property Address | 16 WILLIAM AVE, ISLIP, NY 11751-2716 |
| Document Number | 0132250898 |
| Book / Page | 13225 / 898 |
| Instrument Date | Jul 10, 2023 |
| Transaction Type | Transfer |
| Record Updated | Mar 26, 2024 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Zero or No Consideration Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 112 SPRUCE ST # STE5, STE5, CEDARHURST, NY 11516-1901 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SUFFOLK NY |
| Property Address | 16 WILLIAM AVE, ISLIP, NY 11751-2716 |
| Transaction Type | Mortgage |
| Record Updated | Dec 28, 2021 |
| Name | Verified Name |
|---|
| Document Number | 0233470973 |
|---|---|
| Date | Nov 18, 2021 |
| Book Page | 23347/973 |
| Instrument | DM048096 |
| Name | CITIBANK NA |
|---|---|
| Type | Bank |
| Type | Stand Alone Refinance |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Dec 01, 2051 |
Source: Suffolk County and Islip Town records · Assessment roll updated August 11, 2026 · Last verified August 2026
| Type | Name |
|---|---|
| State | New York |
| County | Suffolk County |
| County Subdivision | Islip Town |
| Unified School District | Islip Union Free School District (KG - 12) |
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.
| Year | Assessed Value | Assessed Market Value |
|---|---|---|
| 2025 | $51,000 (-) Land $8,600 Building $42,400 | |
| 2024 | $718,310 (+2.54%) Land $121,127 Building $597,183 | |
| 2023 | $51,000 Land $8,600 Building $42,400 | $700,550 Land $118,132 Building $582,418 |
Source: FEMA National Flood Hazard Layer, Suffolk County (36103C), updated September 18, 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X |
|---|---|
| Flood Hazard | Minimal |
| 500-Year Floodplain | No |
| Special Flood Hazard Area | No |
| Wildfire Risk | Not rated no burnable land in reach |
|---|---|
| Wildfire Likelihood | Negligible |
| Exposure | None beyond ember reach |
Values are read at the parcel center point; lenders make the official flood determination.
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