| Primary address | 15 William Street, Central Islip |
| Zip code | 11722 |
| County | Suffolk |
| Municipality | Islip |
| Parcel ID | 99-2-26 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Sale date | 09/27/2001 |
| Sale price | $214,000 |
| Arm's length | Register |
| Property tax | $11,278 |
| Building class | Three Family Year-Round Residence (230) |
| Acreage | 0.29 |
| Units | 3 |
| Zoning district | Register |
| School district | Central Islip |
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 $37,000, the tax amount paid for 15 William Street, Central Islip, NY 11722 is $11,277.
When was 15 William Street, Central Islip, NY 11722 last sold and what was the last sale price?15 William Street, Central Islip, NY 11722 was last sold in 09/27/2001 for $214,000.
How many residential units does this building have?This building has 3 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 15 William Street, Central Islip, including title documents, transfer conditions, mortgages and liens.
| Purchase date | Purchase price | Buyer name | Seller name |
|---|---|---|---|
| 09/27/2001 | $214,000 | Register | Register |
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 15 William Street, Central Islip, NY 11722. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year | 2025-2026 |
| Property tax | $11,278 |
| Market value | $521,127 |
| Assessed value | $37,000 |
Here's the assessment & property tax history for 15 William Street, Central Islip, 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 | $521,127 | $37,000 | 29.569 | $10,941 | +5.71% |
| 2023-2024 | $508,242 | $37,000 | 27.973 | $10,350 | -1.12% |
| 2022-2023 | $446,860 | $37,000 | 28.29 | $10,467 | +0.97% |
| 2021-2022 | $398,707 | $37,000 | 28.019 | $10,367 | -2.89% |
| 2020-2021 | $381,443 | $37,000 | 28.854 | $10,676 | +3.66% |
The complete history of permits filed for 15 William Street, Central Islip, 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 15 William Street, Central Islip, 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 15 William Street, Central Islip 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) |
|---|---|---|---|---|---|
| Charles A Mulligan School | 4 | Public | K-6 | 981 | 0.13 |
| Francis J O Neill School | 5 | Public | K-6 | 614 | 0.32 |
| Anthony Alfano Elementary School | 5 | Public | PK, K-6 | 586 | 0.55 |
| Anthony Alfano Elementary School | 5 | Public | PK, K-6 | 586 | 0.55 |
| Our Lady Of Providence Regional School | NR | Private | PK-8 | 251 | 0.56 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Ralph Reed School | 3 | Public | 7-8 | 1,149 | 0.36 |
| Our Lady Of Providence Regional School | NR | Private | PK-8 | 251 | 0.56 |
| Gersh Academy | NR | Private | 6-12 | 0 | 1.55 |
| Hauppauge Middle School | 6 | Public | 6-8 | 748 | 2.13 |
| East Middle School | 4 | Public | 6-8 | 1,159 | 2.20 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Central Islip Senior High School | 3 | Public | 9-12 | 2,576 | 0.65 |
| Gersh Academy | NR | Private | 6-12 | 0 | 1.55 |
| Hauppauge High School | 9 | Public | 9-12 | 1,079 | 1.99 |
| MDQ Academy | NR | Private | PK-12 | 412 | 2.85 |
| Connetquot High School | 8 | Public | 9-12 | 1,757 | 3.05 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 15 William Street, Central Islip.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 28 Seafield Ln, Bay Shore | 1,842 | 12/10/2020 | $542,500 |
| 955 Grundy Ave, Holbrook | 04/01/2024 | $715,995 | |
| 161 Lawrence Ave, Hauppauge | 05/01/2001 | $278,000 | |
| 1 Privet Pl, Bay Shore | 05/01/2001 | $180,000 | |
| 42 Opal St, Holbrook | 04/30/2001 | $200,000 | |
| 298 Montauk Hwy, Bay Shore | 07/20/2016 | $725,000 | |
| 2263 1st Ave, Ronkonkoma | 05/25/2005 | ||
| 1450 Richland Blvd, Bay Shore | 04/26/2004 | $295,500 | |
| 33 Magnolia St, Central Islip | 06/22/2005 | $323,000 | |
| 211 San Juan Dr, Hauppauge | 05/23/2014 | ||
| 224 Foster Ave, Sayville | 04/06/2001 | ||
| 9 Sunburst Ter, Central Islip | 10/15/2010 | $207,500 | |
| 11 Pine Wild Rd, Brentwood | 06/10/2016 | $236,000 | |
| 10 Carolyn CT, Bohemia | 04/11/2001 | ||
| 12 Bradish Ln, Bay Shore | 2,892 | 09/01/2020 | $645,000 |
| 28 Snedecor Ave, Bayport | 07/06/2001 | $270,000 | |
| 62 Washington Ave, Brentwood | 1,530 | 10/05/2018 | $354,999 |
| 17 Goldenwood Cir, Central Islip | 1,400 | 04/12/2022 | |
| 236 Loeffler St, Brentwood | 03/29/2013 | $319,000 | |
| 44 Prospect Ave, Brentwood | 04/26/2001 | $176,000 |