| Primary address | 21 Frost Valley Road, Mount Sinai |
| Zip code | 11766 |
| County | Suffolk |
| Municipality | Brookhaven |
| Parcel ID | 1126159 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Current property tax | $19,726 |
| Building sqft | 4,278 |
| Building class | One Family Year-Round Residence (210) |
| Acreage | 0.69 |
| Year built | 1987 |
| Rooms | 8 |
| Bedrooms | 4 |
| Bathrooms | 2 |
| School district | Mount Sinai |
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).
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21 Frost Valley Road, Mount Sinai, NY 11766 was built in 1987 and has a total of 4,278 square feet.
What is the assessed value of 21 Frost Valley Road, Mount Sinai, NY 11766 and the property tax paid?Assessed at $5,330, the tax amount paid for 21 Frost Valley Road, Mount Sinai, NY 11766 is $21,918.
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 Frost Valley Road, Mount Sinai, including title documents, transfer conditions, mortgages and liens.
Access detailed property tax data for 21 Frost Valley Road, Mount Sinai, NY 11766. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year | 2025-2026 |
| Base tax | $21,918 |
| Current property tax | $19,726 |
| Market value | $1,005,661 |
| Assessed value | $5,330 |
Here's the assessment & property tax history for 21 Frost Valley Road, Mount Sinai, 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 | $1,005,661 | $5,330 | 411.221 | $21,918 | +4.30% |
| 2024-2025 | $1,005,661 | $5,330 | 394.249 | $21,013 | +3.18% |
| 2023-2024 | $987,037 | $5,330 | 382.097 | $20,366 | +3.44% |
| 2022-2023 | $859,678 | $5,330 | 369.378 | $19,688 | +2.22% |
| 2021-2022 | $720,270 | $5,330 | 361.352 | $19,260 | -2.56% |
The complete history of permits filed for 21 Frost Valley Road, Mount Sinai, 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.
Access a detailed real estate market overview of Brookhaven so you can assess current trends, home values, types of properties sold and transaction volume. View the median home sale price in Brookhaven and compare it to other neighborhoods in Suffolk County.
Create a free account to unlock extended information for 21 Frost Valley Road, Mount Sinai, 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 Frost Valley Road, Mount Sinai 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) |
|---|---|---|---|---|---|
| Port Jefferson Elementary School | 5 | Public | PK, K-5 | 364 | 0.89 |
| Port Jefferson Elementary School | 5 | Public | PK, K-5 | 364 | 0.89 |
| Mount Sinai Middle School | 5 | Public | 5-8 | 667 | 0.93 |
| Maryhaven Center Of Hope | NR | Private | 47 | 1.07 | |
| Our Lady of Wisdom Regional School | NR | Private | PK-8 | 74 | 1.69 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Mount Sinai Middle School | 5 | Public | 5-8 | 667 | 0.93 |
| Maryhaven Center Of Hope | NR | Private | 47 | 1.07 | |
| Our Lady of Wisdom Regional School | NR | Private | PK-8 | 74 | 1.69 |
| Port Jefferson Middle School | 7 | Public | 6-8 | 222 | 1.71 |
| John F Kennedy Middle School | 4 | Public | 4, 6-8 | 822 | 2.08 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Mount Sinai High School | 9 | Public | 9-12 | 720 | 0.71 |
| Maryhaven Center Of Hope | NR | Private | 47 | 1.07 | |
| Earl L Vandermeulen High School | 9 | Public | 9-12 | 323 | 1.71 |
| Comsewogue High School | 6 | Public | 9-12 | 1,153 | 2.55 |
| Miller Place High School | 9 | Public | 9-12 | 820 | 2.69 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 21 Frost Valley Road, Mount Sinai.