Suffolk County and East Hampton Town property record for 21 Flagg Ave, Montauk, NY 11954
| Property Type | Single Family Home |
|---|---|
| Lot Size | 0.17 acres (7,405 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $2,520,000 (Nov 2025) |
| Tax Bill | $5,149 (2024) |
| Deeds & Mortgages | Nov 2025 Sale Sep 2023 Sale & Mortgage |
| Flood Zone | Zone AE (high risk) |
| APN | 472489 30.-4-6 |
| Primary APN | 472489 30.-4-6 |
|---|---|
| Alternative APNs |
|
| Lot Area | 7,405 sqft (0.17 acres) |
|---|
| Street Address | 21 FLAGG AVE |
|---|---|
| City | MONTAUK |
| State | NY |
| Zip | 11954-5208 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | BLK LOT 94 |
| Legal Subdivision | OCEANSIDE AT MONTAUK |
| Legal Block | 4 |
| Legal Lot Number | 6 |
| Jurisdiction | SUFFOLK NY |
| Township / Civil Division | EAST HAMPTON |
| Census Block Group | 1 |
| Census Block | 1018 |
| Census Tract | 201007 |
21 Flagg Ave is held in a trust since November 2025.
Source: Suffolk County and East Hampton Town records, as of August 11, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 420 LEXINGTON AVE, NEW YORK, NY 10170-0002 |
| Owner Type | Individual |
| Vesting | Trust |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Nov 10, 2025 | Deed, Transfer |
| Sep 7, 2023 | Deed, Transfer · Stand-Alone First Mortgage COMMUNITY SAVINGS BANK |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Nov 10, 2025 · Amount on File |
| Deed Sale | Nov 10, 2025 · Amount on File |
| Prior Sale | Sep 7, 2023 · Amount on File |
| Deed Book / Page | 13316 / 47 |
| Prior Transfer Date | Jan 23, 1997 |
| Record Updated | Sep 20, 2026 |
| Document Type | Deed |
|---|---|
| Jurisdiction | SUFFOLK NY |
| Recording Date | Nov 10, 2025 |
| Property Address | 21 FLAGG AVE, MONTAUK, NY 11954-5208 |
| Document Number | 0133160047 |
| Book / Page | 13316 / 47 |
| Instrument Date | Nov 5, 2025 |
| Transaction Type | Transfer |
| Record Updated | Jan 14, 2026 |
| Amount | Amount on Record |
|---|---|
| Tax | $0.00 |
| Amount Accuracy | Full Amount Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 420 LEXINGTON AVE, NEW YORK, NY 10170-0002 |
| Document Type | Deed |
|---|---|
| Jurisdiction | SUFFOLK NY |
| Recording Date | Sep 7, 2023 |
| Property Address | 21 FLAGG AVE, MONTAUK, NY 11954 |
| Document Number | 0132170270 |
| Book / Page | 13217 / 270 |
| Instrument Date | Jul 28, 2023 |
| Transaction Type | Transfer |
| Record Updated | Mar 5, 2024 |
| Amount | Amount on Record |
|---|---|
| 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 | 54 BLEECKER ST APT 2A, 2A, NEW YORK, NY 10012-2447 |
| Document Number | 0023533653 |
|---|---|
| Date | Sep 7, 2023 |
| Instrument | 23533/653 |
| Name | COMMUNITY SAVINGS BANK |
|---|
| Type | Stand-Alone First Mortgage |
|---|---|
| Amount | Amount on Record |
Source: Suffolk County and East Hampton Town assessment roll, as of August 11, 2026
| Type | Name |
|---|---|
| State | New York |
| County | Suffolk County |
| County Subdivision | East Hampton Town |
| Unified School District | Montauk Union Free School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $4,500 (-) Land $400 Building $4,100 | $1,406,250 (+10,837.62%) Land $125,000 Building $1,281,250 | |
| 2024 | $5,149.00 | $4,500 (-) Land $400 Building $4,100 | $12,857 (+5.71%) Land $1,143 Building $11,714 |
| 2023 | $4,500 Land $400 Building $4,100 | $12,162 Land $1,081 Building $11,081 |
Assessed value is set for property tax purposes, not a market price estimate; it is a fraction of this property's market value.
FEMA maps place 21 Flagg Ave in Zone AE, a high-risk flood area; flood insurance is required for federally backed loans.
Source: FEMA National Flood Hazard Layer, effective September 18, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone AE high risk |
|---|---|
| 100-Year Floodplain | Yes 1% annual chance |
| Floodway | No |
| Base Flood Elevation | 11.0 ft |
| Flood Insurance Requirement | Required federally backed loans |
| Flood Insurance Cost | Premium on File median of 216 individual policies |
| Nearby Flood Policies | 224 units insured incl. 8 condo units |
| Nearby Flood Claims | 14 (2005–2024) |
| Claims Outside the SFHA | 5 of 14 |
| Most Recent Claim | Jan 2024 · rainfall accumulation |
| Claims by Event |
|
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 21 Flagg Ave is low, with 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 80% of the US · above 54% of New York |
|---|---|
| Wildfire Likelihood | 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 446 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Optimum Fiber · Cable | 8,000 / 8,000 |
| Starlink Satellite | 280 / 30 |
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