Suffolk County and Brookhaven Town property record for 21 Knickerbocker Ave, Holbrook, NY 11741
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1 ba · 1,204 sqft · built 1960 |
| Lot Size | 0.25 acres (10,890 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $285,000 (May 2016) |
| Tax Bill | $9,267 (2024) |
| Deeds & Mortgages | Jul 2023 Line of Credit |
| Flood Zone | Zone X (minimal risk) |
| APN | 0200-801.00-03.00-003.000 |
| Primary APN | 0200-801.00-03.00-003.000 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 5 Rooms |
| Stories | 1 Story |
| Building Area | 1,204 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1960 |
|---|---|
| Effective Year Built | Effective 1960 |
| Architectural Style | Ranch |
| Exterior Material | Brick |
| Lot Area | 10,890 sqft (0.25 acres) |
| View / Lot | Waterfront |
| Heating System | Radiant |
|---|
| Account Number | 8000690 |
|---|---|
| Street Address | 21 KNICKERBOCKER AVE |
| City | HOLBROOK |
| State | NY |
| Zip | 11741-1722 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | N BIANCHI T. S5-24 E MAUCELLI L. S |
| Legal Subdivision | HOLBROOK |
| Legal Block | 1000 |
| Legal Lot Number | 300 |
| Jurisdiction | SUFFOLK NY |
| Township / Civil Division | BROOKHAVEN |
| Census Block Group | 2 |
| Census Block | 2013 |
| Census Tract | 158604 |
21 Knickerbocker Ave is owned and occupied by two individuals who bought it in May 2016.
Source: Suffolk County and Brookhaven Town records, as of August 11, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 21 KNICKERBOCKER AVE, HOLBROOK, NY 11741-1722 |
| 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 | May 6, 2016 · Amount on File |
| Deed Sale | May 6, 2016 · Amount on File |
| Prior Sale | May 6, 2016 · Amount on File |
| Deed Book / Page | 12863 / 642 |
| Record Updated | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SUFFOLK NY |
| Property Address | 21 KNICKERBOCKER AVE, HOLBROOK, NY 11741-1722 |
| Transaction Type | Mortgage |
| Record Updated | Feb 27, 2024 |
| Name | Verified Name |
|---|
| Document Number | 0235230153 |
|---|---|
| Date | Jul 27, 2023 |
| Book Page | 23523/153 |
| Name | MANUFACTURERS & TRADERS TRUST CO |
|---|---|
| Type | Bank |
| Type | Line of Credit |
|---|---|
| Amount | Amount on Record |
| Term | 349 Months |
| Due | Aug 1, 2052 |
| Rate Type | Adjustable Rate |
|---|
Source: Suffolk County and Brookhaven Town assessment roll, as of August 11, 2026
| Type | Name |
|---|---|
| State | New York |
| County | Suffolk County |
| County Subdivision | Brookhaven Town |
| Unified School District | Sachem Central School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $2,550 Land $400 Building $2,150 | $531,250 Land $75,472 Building $405,660 | |
| 2024 | $9,267.00 | ||
| 2023 | $2,550 Land $400 Building $2,150 | $4,722 Land $741 Building $3,981 |
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 Knickerbocker Ave in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective September 18, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
Wildfire risk around 21 Knickerbocker 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 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 87 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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