| Primary address | 4 Old Post Road, Mount Sinai |
| Zip code | 11766 |
| County | Suffolk |
| Municipality | Brookhaven |
| Parcel ID | 8710926 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Sale date | 06/05/2018 |
| Sale price | $507,500 |
| Arm's length | Register |
| Property tax | $16,737 |
| Building sqft | 3,731 |
| Building class | One Family Year-Round Residence (210) |
| Acreage | 0.92 |
| Year built | 1820 |
| Rooms | 9 |
| 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).
Create a free account to access valuable data points such as:
4 Old Post Road, Mount Sinai, NY 11766 was built in 1820 and has a total of 3,731 square feet.
What is the assessed value of 4 Old Post Road, Mount Sinai, NY 11766 and the property tax paid?Assessed at $4,070, the tax amount paid for 4 Old Post Road, Mount Sinai, NY 11766 is $16,736.
When was 4 Old Post Road, Mount Sinai, NY 11766 last sold and what was the last sale price?4 Old Post Road, Mount Sinai, NY 11766 was last sold in 06/05/2018 for $507,500.
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 4 Old Post Road, Mount Sinai, 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 4 Old Post Road, Mount Sinai, NY 11766. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year | 2025-2026 |
| Property tax | $16,737 |
| Market value | $767,925 |
| Assessed value | $4,070 |
Here's the assessment & property tax history for 4 Old Post 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 | $767,925 | $4,070 | 411.221 | $16,737 | +4.30% |
| 2024-2025 | $767,925 | $4,070 | 394.249 | $16,046 | +3.18% |
| 2023-2024 | $753,704 | $4,070 | 382.097 | $15,551 | +3.44% |
| 2022-2023 | $656,452 | $4,070 | 369.378 | $15,034 | +2.22% |
| 2021-2022 | $550,000 | $4,070 | 361.352 | $14,707 | +2.37% |
The complete history of permits filed for 4 Old Post 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 4 Old Post 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 4 Old Post 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) |
|---|---|---|---|---|---|
| Mount Sinai Middle School | 5 | Public | 5-8 | 667 | 0.80 |
| Port Jefferson Elementary School | 5 | Public | PK, K-5 | 364 | 1.26 |
| Port Jefferson Elementary School | 5 | Public | PK, K-5 | 364 | 1.26 |
| Maryhaven Center Of Hope | NR | Private | 47 | 1.45 | |
| Mount Sinai Elementary School | 7 | Public | K-4 | 659 | 1.64 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Mount Sinai Middle School | 5 | Public | 5-8 | 667 | 0.80 |
| Maryhaven Center Of Hope | NR | Private | 47 | 1.45 | |
| Our Lady of Wisdom Regional School | NR | Private | PK-8 | 74 | 2.01 |
| North Country Road School | 5 | Public | 6-8 | 534 | 2.07 |
| Port Jefferson Middle School | 7 | Public | 6-8 | 222 | 2.10 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Mount Sinai High School | 9 | Public | 9-12 | 720 | 0.64 |
| Maryhaven Center Of Hope | NR | Private | 47 | 1.45 | |
| Earl L Vandermeulen High School | 9 | Public | 9-12 | 323 | 2.10 |
| Miller Place High School | 9 | Public | 9-12 | 820 | 2.44 |
| Comsewogue High School | 6 | Public | 9-12 | 1,153 | 2.76 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 4 Old Post Road, Mount Sinai.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 140 MT Sinai Ave, Mount Sinai | 2,471 | 10/07/2010 | |
| 60 N Country Rd, Mount Sinai | 751 | ||
| 555 Canal Rd, Mount Sinai | 2,001 | 03/13/2018 | $425,000 |
| 123 MT Sinai Ave, Mount Sinai | 2,774 | 10/12/1995 | $232,500 |
| 48 Birch Hill Rd, Mount Sinai | 1,637 | 01/31/2022 | $650,000 |
| 49 N Country Rd, Mount Sinai | 3,684 | 12/02/2020 | $749,888 |
| 111 N Country Rd, Mount Sinai | 1,649 | 08/18/2021 | $470,000 |
| 47 N Country Rd, Mount Sinai | 1,990 | 07/27/2015 | $469,996 |
| 9 High Hill Rd, Mount Sinai | 2,088 | 01/09/2015 | $310,000 |
| 31 Ashland St, Mount Sinai | 1,527 | 11/01/2021 | |
| 6 Old Post Rd, Mount Sinai | 2,952 | ||
| 8 Old Post Rd, Mount Sinai | 06/27/2007 | ||
| 188 MT Sinai Ave, Mount Sinai | 1,536 | ||
| 179 MT Sinai Ave, Mount Sinai | 09/10/2015 | ||
| 119 MT Sinai Ave N, Mount Sinai | 1,800 | 08/09/2005 | |
| 42 Birch Hill Rd, Mount Sinai | 1,467 | 12/22/2023 | |
| 88 Old Post Rd, Mount Sinai | 08/21/2023 | $484,700 | |
| 559 Canal Rd, Mount Sinai | 1,182 | 08/18/2023 | $515,000 |
| 529 MT Sinai CRM Rd, Mount Sinai | 12/14/2023 | $499,999 | |
| 6 Ashland St, Mount Sinai | 1,429 | 05/11/2022 |