| Primary address | 21 Franklin Avenue, Brentwood |
| Zip code | 11717 |
| County | Suffolk |
| Municipality | Islip |
| Parcel ID | 52-2-53 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Sale date | 07/14/2017 |
| Sale price | $357,000 |
| Arm's length | Register |
| Property tax | $9,433 |
| Building sqft | 2,208 |
| Building class | One Family Year-Round Residence (210) |
| Acreage | 0.45 |
| Year built | 1959 |
| 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:
21 Franklin Avenue, Brentwood, NY 11717 was built in 1959 and has a total of 2,208 square feet.
What is the assessed value of 21 Franklin Avenue, Brentwood, NY 11717 and the property tax paid?Assessed at $40,200, the tax amount paid for 21 Franklin Avenue, Brentwood, NY 11717 is $9,432.
When was 21 Franklin Avenue, Brentwood, NY 11717 last sold and what was the last sale price?21 Franklin Avenue, Brentwood, NY 11717 was last sold in 07/14/2017 for $357,000.
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 Franklin 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 Franklin Avenue, Brentwood, NY 11717. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year | 2025-2026 |
| Property tax | $9,433 |
| Market value | $566,197 |
| Assessed value | $40,200 |
Here's the assessment & property tax history for 21 Franklin 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 | $577,464 | $41,000 | 22.743 | $9,325 | +4.85% |
| 2023-2024 | $563,187 | $41,000 | 21.691 | $8,893 | -0.19% |
| 2022-2023 | $495,170 | $41,000 | 21.733 | $8,911 | +2.00% |
| 2021-2022 | $441,810 | $41,000 | 21.306 | $8,735 | +2.65% |
| 2020-2021 | $417,526 | $40,500 | 21.013 | $8,510 | +4.58% |
The complete history of permits filed for 21 Franklin 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 Franklin 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 Franklin 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) |
|---|---|---|---|---|---|
| Northeast Elementary School | 4 | Public | 1-5 | 942 | 0.48 |
| North Elementary School | 4 | Public | 1-5 | 855 | 1.32 |
| East Elementary School | NR | Public | PK, K | 507 | 1.39 |
| East Elementary School | NR | Public | PK, K | 507 | 1.39 |
| Pine Park Elementary School | NR | Public | K-1 | 534 | 1.55 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| East Middle School | 4 | Public | 6-8 | 1,159 | 1.34 |
| North Middle School | 4 | Public | 6-8 | 1,131 | 1.71 |
| Freshman Center | NR | Public | 9 | 1,247 | 1.95 |
| MDQ Academy | NR | Private | PK-12 | 412 | 1.96 |
| Our Lady Of Providence Regional School | NR | Private | PK-8 | 251 | 2.15 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Central Islip Senior High School | 3 | Public | 9-12 | 2,576 | 1.60 |
| Freshman Center | NR | Public | 9 | 1,247 | 1.95 |
| MDQ Academy | NR | Private | PK-12 | 412 | 1.96 |
| Brentwood High School | 3 | Public | 9-12 | 4,641 | 2.17 |
| Hauppauge High School | 9 | Public | 9-12 | 1,079 | 2.33 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 21 Franklin Avenue, Brentwood.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 346 Johnson Ave, Ronkonkoma | 1,501 | 01/23/2020 | $389,990 |
| 62 W Bayberry Rd, Islip | 4,724 | 10/11/2017 | $1,625,000 |
| 183 Twin Lawns Ave, Brentwood | 01/27/2014 | $206,000 | |
| 8 Naples Ave, Central Islip | 09/08/2025 | $575,000 | |
| 1083 Smithtown Ave, Bohemia | 08/12/2024 | ||
| 197 Tahlulah Ln, West Islip | 2,722 | 09/01/2017 | $627,500 |
| 26 Princeton St, Bay Shore | 02/07/2025 | $560,000 | |
| 15 E End Walk, Bay Shore | 09/18/2006 | $550,000 | |
| 234 Candee Ave, Sayville | 08/14/2015 | $525,000 | |
| 2259 Union Blvd, Bay Shore | 07/27/2007 | $4,500,000 | |
| 1559 Lincoln Ave, Bohemia | 01/18/2000 | $205,000 | |
| 57 Grant Ave, Islip | 03/26/2025 | $603,083 | |
| 52 Hamlet Dr, Hauppauge | 2,866 | 03/07/2024 | $925,000 |
| 8 Brightside Ave, Central Islip | 03/06/2006 | $418,000 | |
| 77 W 5th St, Ronkonkoma | 05/15/2012 | $322,000 | |
| 290 Ellery St, Brentwood | 12/08/1999 | $142,000 | |
| 1230 Howells Rd, Bay Shore | 05/08/2013 | $160,000 | |
| 1257 Tuttle St, Holbrook | 12/20/1999 | ||
| 146 Dougherty Ave, Holbrook | 02/18/2011 | $380,000 | |
| 7 E End Walk, Ocean Beach | 09/27/2007 |