| Primary address | 21 William Street, Sparkill |
| Zip code | 10976 |
| County | Rockland |
| Municipality | Orangetown |
| Parcel ID | 77.8-5-25 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Sale date | 04/23/2021 |
| Sale price | $330,000 |
| Arm's length | Register |
| Property tax | $4,326 |
| Building sqft | 540 |
| Building class | One Family Year-Round Residence (210) |
| Acreage | 0.27 |
| Year built | 1933 |
| Stories | 1 |
| Bedrooms | 2 |
| Bathrooms | 1 |
| Kitchen | 1 |
| Water supply | Comm/public |
| Sewer type | Comm/public |
| Building style | Old style |
| Condition | Normal |
| Basement type | Full |
| Exterior wall material | Composition |
| Heat | Hot water/steam |
| Fuel | Gas |
| First story sqft | Register |
| Zoning district | Register |
| School district | South Orangetown |
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:
21 William Street, Sparkill, NY 10976 was built in 1933 and has a total of 540 square feet.
What is the assessed value of 21 William Street, Sparkill, NY 10976 and the property tax paid?Assessed at $85,000, the tax amount paid for 21 William Street, Sparkill, NY 10976 is $4,325.
When was 21 William Street, Sparkill, NY 10976 last sold and what was the last sale price?21 William Street, Sparkill, NY 10976 was last sold in 04/23/2021 for $330,000.
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 William Street, Sparkill, 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 William Street, Sparkill, NY 10976. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year | 2025-2026 |
| Property tax | $4,326 |
| Market value | $266,541 |
| Assessed value | $85,000 |
Here's the assessment & property tax history for 21 William Street, Sparkill, 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 | $248,975 | $85,000 | 50.8921 | $4,326 | +100.84% |
| 2024 | $238,563 | $85,000 | 25.34 | $2,154 | -3.91% |
| 2023 | $226,788 | $85,000 | 26.37 | $2,241 | -9.63% |
| 2022 | $199,343 | $85,000 | 29.18 | $2,480 | +1.53% |
| 2021 | $202,140 | $85,000 | 28.74 | $2,443 | -1.41% |
Create a free account to unlock extended information for 21 William Street, Sparkill, 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) | 0.2, AE, X (See more on map) |
Access the detailed traffic volume map for 21 William Street, Sparkill 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) |
|---|---|---|---|---|---|
| William O Schaefer Elementary School | NR | Public | K-2 | 576 | 1.60 |
| Northvale Public School | 9 | Public | K-8 | 533 | 1.71 |
| St Dominic's School | NR | Private | 1-11 | 77 | 2.23 |
| Preschool Play House/Funland | NR | Private | PK-K | 88 | 2.78 |
| Preschool Play House/Funland | NR | Private | PK-K | 88 | 2.78 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Northvale Public School | 9 | Public | K-8 | 533 | 1.71 |
| St Dominic's School | NR | Private | 1-11 | 77 | 2.23 |
| Rockland Children's Psych Center | NR | Public | 7-12 | 16 | 2.53 |
| Northern Valley Region Iii | NR | Public | PK, K-12 | 197 | 2.83 |
| Clark Academy | NR | Public | 7-12 | 103 | 2.88 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Tappan Zee High School | 9 | Public | 9-12 | 953 | 2.01 |
| St Dominic's School | NR | Private | 1-11 | 77 | 2.23 |
| Rockland Children's Psych Center | NR | Public | 7-12 | 16 | 2.53 |
| Northern Valley Region Iii | NR | Public | PK, K-12 | 197 | 2.83 |
| Clark Academy | NR | Public | 7-12 | 103 | 2.88 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 21 William Street, Sparkill.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 45 Dederer St, Tappan | 1,260 | 04/11/2003 | $357,500 |
| 3 Park Pl, Sparkill | 1,578 | ||
| 40 Polhemus St, Tappan | 2,840 | 11/11/2025 | |
| 80 Dederer St, Sparkill | 2,022 | ||
| 11 William St #A, Sparkill | 2,119 | 01/28/2022 | $600,000 |
| 8 William St, Sparkill | 1,227 | 09/16/2014 | $300,000 |
| 70 Dederer St, Sparkill | 1,876 | 02/10/2011 | $10 |
| 26 Polhemus St, Tappan | 1,896 | 06/25/2007 | $10 |
| 17 William St, Sparkill | 836 | 05/27/2025 | $10 |
| 13 William St, Sparkill | 804 | 03/28/2016 | $290,000 |
| 16 William St, Sparkill | 2,408 | 05/20/2005 | $570,000 |
| 19 William St, Sparkill | 1,122 | 06/29/2021 | $420,000 |
| 32 Polhemus St, Tappan | 1,040 | 06/30/2005 | $425,000 |
| 23 William St, Sparkill | 1,070 | 07/27/2020 | $300,000 |
| 78 Dederer St, Sparkill | 1,708 | 04/25/2023 | $486,000 |
| 1 Park Pl, Sparkill | 1,832 | 10/01/2018 | $10 |
| 15 William St, Sparkill | 2,042 | 11/25/2014 | $325,900 |
| 11 William St, Sparkill | 1,082 | 06/12/2017 | $340,000 |
| 25 William St, Sparkill | |||
| 74 Dederer St, Sparkill | 1,724 | 06/22/2023 | $465,000 |