| Primary address | 21 Madison Avenue, Brentwood |
| Zip code | 11717 |
| County | Suffolk |
| Municipality | Islip |
| Parcel ID | 137-1-33 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Sale date | 10/06/2009 |
| Sale price | $292,000 |
| Arm's length | Register |
| Current property tax | $7,843 |
| Building class | Two Family Year-Round Residence (220) |
| Acreage | 0.21 |
| 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 $36,000, the tax amount paid for 21 Madison Avenue, Brentwood, NY 11717 is $8,447.
When was 21 Madison Avenue, Brentwood, NY 11717 last sold?21 Madison Avenue, Brentwood, NY 11717 was last sold in 04/10/2013.
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 Madison 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 Madison 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 | $8,447 |
| Current property tax | $7,843 |
| Market value | $507,042 |
| Assessed value | $36,000 |
Here's the assessment & property tax history for 21 Madison 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 | $507,042 | $36,000 | 22.743 | $8,187 | +4.85% |
| 2023-2024 | $494,505 | $36,000 | 21.691 | $7,809 | -0.19% |
| 2022-2023 | $434,782 | $36,000 | 21.733 | $7,824 | +2.00% |
| 2021-2022 | $387,931 | $36,000 | 21.306 | $7,670 | +1.39% |
| 2020-2021 | $371,134 | $36,000 | 21.013 | $7,565 | +4.58% |
The complete history of permits filed for 21 Madison 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 Madison 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 Madison 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) |
|---|---|---|---|---|---|
| Pine Park Elementary School | NR | Public | K-1 | 534 | 0.48 |
| Twin Pines Elementary School | 4 | Public | 1-5 | 744 | 0.56 |
| MDQ Academy | NR | Private | PK-12 | 412 | 0.81 |
| MDQ Academy | NR | Private | PK-12 | 412 | 0.81 |
| Northeast Elementary School | 4 | Public | 1-5 | 942 | 1.04 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| MDQ Academy | NR | Private | PK-12 | 412 | 0.81 |
| Freshman Center | NR | Public | 9 | 1,247 | 0.84 |
| East Middle School | 4 | Public | 6-8 | 1,159 | 0.92 |
| South Middle School | 3 | Public | 6-8 | 1,033 | 1.06 |
| North Middle School | 4 | Public | 6-8 | 1,131 | 1.10 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Brentwood High School | 3 | Public | 9-12 | 4,641 | 0.68 |
| MDQ Academy | NR | Private | PK-12 | 412 | 0.81 |
| Freshman Center | NR | Public | 9 | 1,247 | 0.84 |
| Central Islip Senior High School | 3 | Public | 9-12 | 2,576 | 2.59 |
| Brentwood Res Center | NR | Public | 9-10, 12 | 11 | 2.78 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 21 Madison Avenue, Brentwood.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 42 Millay Ln, Bay Shore | 1,966 | 04/21/2017 | $369,900 |
| 253 3rd Ave, Bay Shore | 08/28/2025 | $605,000 | |
| 238 Woodhollow Rd, Great River | 09/20/2012 | ||
| 128 Merrill St, Brentwood | 2,112 | 07/26/2022 | $505,000 |
| 41 Hamilton Ave, Brentwood | 05/04/1998 | $24,000 | |
| 109 Bishop Ln, Holbrook | 06/11/2009 | $410,000 | |
| 37 Montauk Dr, Bay Shore | 1,559 | 11/07/2017 | $280,000 |
| 54 Miller CT, Holbrook | 04/28/1998 | $89,000 | |
| 14 Cheyenne Dr, Bay Shore | 1,584 | 09/30/2021 | $535,000 |
| 24 Prospect Ave, Brentwood | 04/28/1998 | $66,500 | |
| 31 Grahn Dr, Brentwood | 07/06/2005 | $334,000 | |
| 181 Pawnee St, Ronkonkoma | 03/04/2013 | ||
| 60 Percy Williams Dr, East Islip | 4,659 | 06/15/2023 | |
| 23 Pamela Rd, Brentwood | 04/12/2005 | ||
| 116 Cleveland St, Bay Shore | 06/22/2015 | $283,250 | |
| 32 Lawrence Ln, Bay Shore | 4,170 | 03/22/2019 | $1,100,000 |
| 544 Walnut Ave, Bohemia | 1,684 | 11/20/2018 | $370,000 |
| 151 Gibson Ave, Brentwood | 01/05/2026 | $690,000 | |
| 130 Merrill St, Brentwood | 08/19/2005 | $350,000 | |
| 499 St Johns St, Central Islip | 2,112 | 08/26/2023 |