| Primary address | 21 Ralph Avenue, Brentwood |
| Zip code | 11717 |
| County | Suffolk |
| Municipality | Islip |
| Parcel ID | 95-2-22 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Sale date | 01/26/2004 |
| Sale price | $235,870 |
| Arm's length | Register |
| Current property tax | $5,145 |
| Building class | One Family Year-Round Residence (210) |
| Acreage | 0.45 |
| 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 $24,500, the tax amount paid for 21 Ralph Avenue, Brentwood, NY 11717 is $5,748.
When was 21 Ralph Avenue, Brentwood, NY 11717 last sold?21 Ralph Avenue, Brentwood, NY 11717 was last sold in 12/09/2005.
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 Ralph 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 Ralph 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 | $5,749 |
| Current property tax | $5,145 |
| Market value | $345,070 |
| Assessed value | $24,500 |
Here's the assessment & property tax history for 21 Ralph 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 |
|---|---|---|---|---|---|
| 2025-2026 | $345,070 | $24,500 | 23.465 | $5,749 | +3.17% |
| 2024-2025 | $345,070 | $24,500 | 22.743 | $5,572 | +4.85% |
| 2023-2024 | $336,539 | $24,500 | 21.691 | $5,314 | -0.19% |
| 2022-2023 | $295,894 | $24,500 | 21.733 | $5,325 | +2.00% |
| 2021-2022 | $264,009 | $24,500 | 21.306 | $5,220 | +1.39% |
The complete history of permits filed for 21 Ralph 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 Ralph 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 Ralph 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 | 0.61 |
| East Elementary School | NR | Public | PK, K | 507 | 0.62 |
| East Elementary School | NR | Public | PK, K | 507 | 0.62 |
| MDQ Academy | NR | Private | PK-12 | 412 | 1.25 |
| MDQ Academy | NR | Private | PK-12 | 412 | 1.25 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| East Middle School | 4 | Public | 6-8 | 1,159 | 0.58 |
| MDQ Academy | NR | Private | PK-12 | 412 | 1.25 |
| Our Lady Of Providence Regional School | NR | Private | PK-8 | 251 | 1.77 |
| North Middle School | 4 | Public | 6-8 | 1,131 | 1.77 |
| Freshman Center | NR | Public | 9 | 1,247 | 1.78 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| MDQ Academy | NR | Private | PK-12 | 412 | 1.25 |
| Central Islip Senior High School | 3 | Public | 9-12 | 2,576 | 1.53 |
| Brentwood High School | 3 | Public | 9-12 | 4,641 | 1.63 |
| Freshman Center | NR | Public | 9 | 1,247 | 1.78 |
| Hauppauge High School | 9 | Public | 9-12 | 1,079 | 2.77 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 21 Ralph Avenue, Brentwood.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 29 Evergreen Ave, Brentwood | 1,222 | 12/13/2021 | $380,000 |
| 33 Matinecock Ave, East Islip | 4,014 | 12/21/2017 | $312,000 |
| 1 Puritan Rd, Sayville | 04/01/2002 | $465,000 | |
| 139 Riddle St, Brentwood | 08/06/2002 | $260,000 | |
| 219 Seminole St, Ronkonkoma | 02/27/2024 | ||
| 53 E Lighthouse Walk, Bay Shore | 11/06/2009 | $510,000 | |
| 416 Asharoken Blvd, Bay Shore | 1,666 | 08/27/2020 | $360,000 |
| 238 Breeze Ave, Ronkonkoma | 12/28/1998 | $159,000 | |
| 322 Aster Rd, West Islip | 12/23/1998 | $155,000 | |
| 209 Loop Dr, Sayville | 08/26/2025 | $545,000 | |
| 29 Ashford Dr, Bohemia | 01/13/1999 | $236,500 | |
| 67 Buckingham Dr, Holbrook | 12/04/1998 | $325,000 | |
| 94 Herbert St, Islip | 01/27/2025 | ||
| 430 Renee Dr, Bayport | 01/08/1999 | ||
| 62 C Cedar Dr, Bay Shore | 2,412 | 04/21/2020 | |
| 361 Thrift St, Ronkonkoma | 08/12/2004 | $423,000 | |
| 115 Weichers Ave, Ronkonkoma | 590 | 03/04/2020 | $260,000 |
| 72 Beatrice Ave, West Islip | 07/07/2009 | $340,000 | |
| 25 Cooper Ln, Bay Shore | 04/18/2013 | $380,000 | |
| 646 Nichols Rd, Hauppauge | 1,060 | 02/08/2019 | $335,000 |