Nassau County and Oyster Bay Town property record for 313 Underhill Blvd, Syosset, NY 11791
| Property Type | Commercial Office |
|---|---|
| Details | 63,400 sqft · built 2003 |
| Lot Size | 4.36 acres (190,357 sqft) |
| Owner | Company Name on Record |
| Last Sale | $17,694,245 (Nov 2006) |
| Deeds & Mortgages | Mar 2019 Mortgage Mar 2019 Mortgage + 1 more |
| Flood Zone | Zone X (minimal risk) |
| APN | 15-169-00-0022 |
| Primary APN | 15-169-00-0022 |
|---|---|
| Alternative APNs |
|
| Stories | 1 Story |
|---|---|
| Building Area | 63,400 sqft Gross Area |
| 1st Floor Area | 63,400 sqft |
| Interior Walls | Finished/Painted |
| Fire Sprinklers | Fire Sprinklers |
| Elevator | Elevator |
| Year Built | Built 2003 |
|---|---|
| Effective Year Built | Effective 2003 |
| Exterior Material | Brick Veneer |
| Construction Type | Steel Frame |
| Fire Resistance | Masonry Walls, Wood Interior |
| Lot Area | 190,357 sqft |
| View / Lot | Commercial/Industrial |
| Cooling System | Central |
|---|---|
| Heating System | HVAC |
| Sewer | Municipal |
| Water Source | Commercial |
| Account Number | 15169 00220 |
|---|---|
| Street Address | 313 UNDERHILL BLVD |
| City | SYOSSET |
| State | NY |
| Zip | 11791-3411 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Commercial Office |
| Legal Description | TOWN #3 SCH DIST 014 |
| Legal Block | 169 |
| Legal Lot Number | 22 |
| Jurisdiction | NASSAU NY |
| Township / Civil Division | OYSTER BAY |
| Census Block Group | 2 |
| Census Block | 2022 |
| Census Tract | 518300 |
Source: Nassau County and Oyster Bay Town records, as of June 17, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Company Name on Record |
|---|---|
| Mailing Address | 1100 FRANKLIN AVE, 300, GARDEN CITY, NY 11530-1601 |
| Owner Type | Company |
| Date | Document |
|---|---|
| Mar 7, 2019 | Grant Deed, Mortgage TD BK NA |
| Mar 13, 2019 | Grant Deed, Mortgage SYOSSET PROP PTRS LLC |
| Jan 9, 2017 | Loan Modification, Consolidation and Extension, Mortgage TD BK NA |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Nov 1, 2006 · Amount on Record |
| Deed Sale | Nov 1, 2006 · Amount on Record |
| Prior Sale | May 7, 2003 · Amount on Record |
| Deed Book / Page | 12191 / 735 |
| Prior Transfer Date | May 9, 2002 |
| Prior Transfer Doc | 1148000656 |
| Record Updated | Sep 20, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | NASSAU NY |
| Recording Date | Mar 7, 2019 |
| Property Address | 313 UNDERHILL BLVD, SYOSSET, NY 11791-3411 |
| Document Number | 0433300114 |
| Book / Page | 043330 / 000114 |
| Instrument Date | Feb 19, 2019 |
| Instrument | 20582 |
| Transaction Type | Mortgage |
| Record Updated | Mar 25, 2019 |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|---|
| Relationship | Company |
| Address | 345 UNDERHILL BLVD SYOSSET NY 117913425, SYOSSET, NY 11791-3425 |
| Document Number | 433300114 |
|---|---|
| Date | Mar 7, 2019 |
| Book Page | 043330/000114 |
| Instrument | 20582 |
| Name | TD BK NA |
|---|---|
| Type | Bank |
| Address | 324 S SERVICE RD # 4, MELVILLE, NY 11747-3270 |
| Amount | Amount Recorded |
|---|
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | NASSAU NY |
| Recording Date | Mar 13, 2019 |
| Property Address | 313 UNDERHILL BLVD, SYOSSET, NY 11791-3411 |
| Document Number | 0433400881 |
| Book / Page | 043340 / 000881 |
| Instrument Date | Feb 1, 2019 |
| Instrument | 22498 |
| Transaction Type | Mortgage |
| Record Updated | Apr 16, 2019 |
| Title Company | NOT AVAILABLE |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|---|
| Relationship | Company |
| Address | 1 WEST ST MINEOLA NY 115014813, MINEOLA, NY 11501-4813 |
| Document Number | 433400881 |
|---|---|
| Date | Mar 13, 2019 |
| Book Page | 043340/000881 |
| Instrument | 22498 |
| Name | SYOSSET PROP PTRS LLC |
|---|---|
| Address | SYOSSET, NY 11791-9034 |
| Amount | Amount Recorded |
|---|---|
| Term | 24 Months |
| Due | Mar 12, 2021 |
| Document Type | Loan Modification, Consolidation and Extension |
|---|---|
| Jurisdiction | NASSAU NY |
| Recording Date | Jan 9, 2017 |
| Property Address | 313 UNDERHILL BLVD, SYOSSET, NY 11791-3411 |
| Document Number | 0418260780 |
| Book / Page | 04182 / 000780 |
| Instrument Date | Dec 23, 2016 |
| Instrument | 2263 |
| Transaction Type | Mortgage |
| Record Updated | Jan 13, 2020 |
| Title Company | ATTORNEY ONLY |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|---|
| Relationship | Company |
| Address | 1550 FRANKLIN AVE #235 MINEOLA NY 115014801, 235, MINEOLA, NY 11501-4801 |
| Document Number | 418260780 |
|---|---|
| Date | Jan 9, 2017 |
| Book Page | 041826/000780 |
| Instrument | 2263 |
| Name | TD BK NA |
|---|---|
| Type | Bank |
| Address | 324 S SERVICE RD, MELVILLE, NY 11747-3270 |
| Amount | Amount Recorded |
|---|
Source: Nassau County and Oyster Bay Town assessment roll, as of June 17, 2026
| Type | Name |
|---|---|
| State | New York |
| County | Nassau County |
| County Subdivision | Oyster Bay Town |
| Unified School District | Syosset Central School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $91,836 (-) Land $42,830 Building $49,006 | $9,183,600 (-) | |
| 2023 | Additional exemption filed | $91,836 Land $42,830 Building $49,006 | $9,183,600 |
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 April 5, 2023 · 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 | 1 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 | Not rated no burnable land within 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 | JERICHO WD public/private · serves 58,000 people · EPA ID NY2902831 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Oct 2023 |
| Lead | 2 ppb (2026) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | Corrosion control Jul 2023 |
| 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 323 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 |
| T-Mobile Fixed Wireless | 100 / 20 |
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