| Primary address | 21 9th Avenue, Brentwood |
| Zip code | 11717 |
| County | Suffolk |
| Municipality | Islip |
| Parcel ID | 183-1-36 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Sale date | 06/15/2004 |
| Sale price | $340,000 |
| Arm's length | Register |
| Current property tax | $6,904 |
| Building class | Two Family Year-Round Residence (220) |
| Acreage | 0.26 |
| Units | 2 |
| Zoning district | Register |
| School district | Brentwood |
View more neighborhood information such as transportation, nearby schools and risk designations in the dedicated tab.
Property reports include comprehensive occupancy, improvement and development information (where available).
Create a free account to access valuable data points such as:
Assessed at $32,000, the tax amount paid for 21 9th Avenue, Brentwood, NY 11717 is $7,508.
When was 21 9th Avenue, Brentwood, NY 11717 last sold and what was the last sale price?21 9th Avenue, Brentwood, NY 11717 was last sold in 06/15/2004 for $340,000.
How many residential units does this building have?This building has 2 residential unit(s).
View detailed property contacts like owners, building management, representatives from permits and tenants with a free account.
Create a free account to view the complete sales history for 21 9th Avenue, Brentwood, including title documents, transfer conditions, mortgages and liens.
*Here are the three most recent sales for this property.
To view the complete history of deeds, mortgages, assignments of leases and rents, and more, sign up for free. Available data goes back to 1966.
R: Recorded date
D: Document date
Access detailed property tax data for 21 9th Avenue, Brentwood, NY 11717. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year | 2025-2026 |
| Base tax | $7,509 |
| Current property tax | $6,904 |
| Market value | $450,704 |
| Assessed value | $32,000 |
Here's the assessment & property tax history for 21 9th Avenue, Brentwood, including the evolution of the total tax rate and corresponding property tax.
| Year | Market value | Assessment value | Total tax rate | Property tax | Year over year change |
|---|---|---|---|---|---|
| 2024-2025 | $450,704 | $32,000 | 22.743 | $7,278 | +4.85% |
| 2023-2024 | $439,560 | $32,000 | 21.691 | $6,941 | -0.19% |
| 2022-2023 | $386,473 | $32,000 | 21.733 | $6,955 | +2.00% |
| 2021-2022 | $344,828 | $32,000 | 21.306 | $6,818 | +1.39% |
| 2020-2021 | $329,897 | $32,000 | 21.013 | $6,724 | +4.58% |
The complete history of permits filed for 21 9th Avenue, Brentwood, including new construction or demolition permits, plus any work pertaining to plumbing, heating and sprinkler systems is available with a free account. Available data goes back to 1990.
Create a free account to unlock extended information for 21 9th Avenue, Brentwood, including whether it's located in FEMA flood zones, floodways or special flood hazard areas, as well as the Coastal barriers resources system area (COBRA).
| FEMA flood zone(s) | X (See more on map) |
Access the detailed traffic volume map for 21 9th Avenue, Brentwood to see estimated average daily traffic on streets surrounding the property as well as the types of properties in its vicinity.
| View daily traffic map |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Oak Park Elementary School | 2 | Public | K-5 | 711 | 0.45 |
| MDQ Academy | NR | Private | PK-12 | 412 | 0.54 |
| MDQ Academy | NR | Private | PK-12 | 412 | 0.54 |
| Southeast Elementary School | 5 | Public | 1-5 | 566 | 1.13 |
| Laurel Park Elementary School | 3 | Public | 1-5 | 665 | 1.24 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| South Middle School | 3 | Public | 6-8 | 1,033 | 0.16 |
| MDQ Academy | NR | Private | PK-12 | 412 | 0.54 |
| East Middle School | 4 | Public | 6-8 | 1,159 | 1.25 |
| Freshman Center | NR | Public | 9 | 1,247 | 1.39 |
| North Middle School | 4 | Public | 6-8 | 1,131 | 1.85 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Brentwood High School | 3 | Public | 9-12 | 4,641 | 0.35 |
| MDQ Academy | NR | Private | PK-12 | 412 | 0.54 |
| Freshman Center | NR | Public | 9 | 1,247 | 1.39 |
| Bay Shore Senior High School | 5 | Public | 9-12 | 1,910 | 2.63 |
| Central Islip Senior High School | 3 | Public | 9-12 | 2,576 | 3.06 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 21 9th Avenue, Brentwood.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 426 Washington Ave, Brentwood | 10/09/2023 | ||
| 45 Kemi Ln, Sayville | 07/07/2005 | $975,000 | |
| 69 S Ocean Ave, Bayport | 06/18/2004 | $750,000 | |
| 24 Beverly St, Islip | 10/04/2007 | $335,000 | |
| 17 Stewart St, Bay Shore | 01/10/2012 | $169,000 | |
| 201 Country Village Ln, East Islip | 04/12/2017 | $20,000 | |
| 27 Gladstone Ave, West Islip | 09/10/2010 | ||
| 590 Lincoln Ave, Sayville | 08/20/2015 | $625,000 | |
| 1565 Baldwin Blvd, Bay Shore | 952 | 05/21/2021 | $310,000 |
| 3 Manny Rose CT, Blue Point | 02/11/2006 | ||
| 127 Haynes Ave, West Islip | 1,321 | 08/16/2017 | $371,000 |
| 212 Hilltop Dr, Brentwood | 04/12/2013 | ||
| 149 Connetquot Ave, East Islip | 02/02/2012 | ||
| 190 Cecil Ave, Bay Shore | 04/12/2007 | $484,100 | |
| 21 Peters Blvd, Central Islip | 06/11/2004 | $188,500 | |
| 36 Glide Ln, Holtsville | 07/01/2004 | $360,500 | |
| 206 A Springmeadow Dr, Holbrook | 1,313 | 07/10/2025 | $518,000 |
| 810 Ocean Ave, West Islip | 05/12/2004 | $350,000 | |
| 2145 Louis Kossuth Ave, Ronkonkoma | 06/24/2004 | ||
| 163 Secatogue Ln W, West Islip | 02/14/2025 | $3,925,000 |