| Primary address | 21 Knolltop Road, Elmsford |
| Zip code | 10523 |
| County | Westchester |
| Municipality | Greenburgh |
| Parcel ID | 5.50-96-23 |
View detailed information on past sales, title documents and property taxes, including the assessed market value, in their dedicated tabs.
| Sale date | 12/21/2018 |
| Sale price | $740,000 |
| Arm's length | Register |
| Current property tax | $17,610 |
| Building class | One Family Year-Round Residence (210) |
| Acreage | 0.54 |
| Zoning district | Register |
| School district | Greenburgh |
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 $1,016,500, the tax amount paid for 21 Knolltop Road, Elmsford, NY 10523 is $27,783.
When was 21 Knolltop Road, Elmsford, NY 10523 last sold and what was the last sale price?21 Knolltop Road, Elmsford, NY 10523 was last sold in 12/21/2018 for $740,000.
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 Knolltop Road, Elmsford, including title documents, transfer conditions, mortgages and liens.
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 Knolltop Road, Elmsford, NY 10523. Tax information included: property tax, market value and assessed value, exemptions, abatements, and assessment history.
| Tax year | 2025 |
| Base tax | $27,784 |
| Current property tax | $17,610 |
| Market value | $1,016,500 |
| Assessed value | $1,016,500 |
Here's the assessment & property tax history for 21 Knolltop Road, Elmsford, 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 | $1,016,500 | $1,016,500 | 27.333 | $27,784 | +3.35% |
| 2024 | $950,000 | $950,000 | 28.2994 | $26,884 | +10.61% |
| 2023 | $856,000 | $856,000 | 28.3942 | $24,305 | +0.15% |
| 2022 | $827,100 | $827,100 | 29.3433 | $24,270 | -2.42% |
| 2021 | $820,000 | $820,000 | 30.3302 | $24,871 | +10.89% |
Create a free account to unlock extended information for 21 Knolltop Road, Elmsford, 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 Knolltop Road, Elmsford 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) |
|---|---|---|---|---|---|
| Our Lady Of Mount Carmel School | NR | Private | PK, K-8 | 185 | 0.50 |
| Our Lady Of Mount Carmel School | NR | Private | PK, K-8 | 185 | 0.50 |
| NY School for the Deaf | NR | Private | PK, K-12 | 0 | 0.50 |
| NY School for the Deaf | NR | Private | PK, K-12 | 0 | 0.50 |
| New York School for the Deaf | NR | Private | PK-12 | 135 | 0.54 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| Our Lady Of Mount Carmel School | NR | Private | PK, K-8 | 185 | 0.50 |
| NY School for the Deaf | NR | Private | PK, K-12 | 0 | 0.50 |
| New York School for the Deaf | NR | Private | PK-12 | 135 | 0.54 |
| Alexander Hamilton High School | 5 | Public | 7-12 | 485 | 0.62 |
| Blythedale School | NR | Public | K-12 | 123 | 1.44 |
| Name | Rating | Type | Grade range | No of students | Distance to school (mi) |
|---|---|---|---|---|---|
| NY School for the Deaf | NR | Private | PK, K-12 | 0 | 0.50 |
| New York School for the Deaf | NR | Private | PK-12 | 135 | 0.54 |
| Alexander Hamilton High School | 5 | Public | 7-12 | 485 | 0.62 |
| Blythedale School | NR | Public | K-12 | 123 | 1.44 |
| Solomon Schechter-Upper School | NR | Private | 6-12 | 0 | 1.48 |
Data provided by GreatSchools.org © 2025. All rights reserved.
Here are the neighbors for 21 Knolltop Road, Elmsford.
| Address | Square feet | Purchase date | Purchase price |
|---|---|---|---|
| 10 Old Rd, Elmsford | 6,190 | 08/07/2017 | $1,300,000 |
| 17 Old Knollwood Rd, Elmsford | 04/29/2019 | $10,000 | |
| 18 Old Knollwood Rd, Elmsford | 03/18/2021 | $375,000 | |
| 8 Old Rd, Elmsford | |||
| 6 Old Rd, Elmsford | |||
| 2 Crescent Dr, Elmsford | 2,094 | 08/11/2022 | $775,000 |
| 19 Knolltop Rd, Elmsford | 01/09/2025 | ||
| 21 Old Knollwood Rd, Elmsford | 3,250 | 12/03/2019 | $800,000 |
| 16 Old Knollwood Rd, Elmsford | 10/15/2021 | $460,000 | |
| 22 Knolltop Rd, Elmsford | 2,830 | 10/17/2008 | $755,000 |
| 25 Old Knollwood Rd, Elmsford | 01/28/2020 | $555,000 | |
| 16 Crescent Dr, Elmsford | 3,606 | 09/13/2019 | $999,999 |
| 3 Crescent Dr, Elmsford | 01/30/2023 | $850,000 | |
| 10 Salk Dr, Elmsford | 06/24/1999 | $353,000 | |
| 9 Salk Dr, Elmsford | 1,775 | ||
| 23 Old Knollwood Rd, Elmsford | 1,252 | 05/13/2025 | $150,000 |
| 19 Old Knollwood Rd, Elmsford | 1,488 | 09/14/2016 | $650,000 |
| 20 Knolltop Rd, Elmsford | 1,593 | 01/14/2013 | $500,000 |
| 2 Old Rd, Elmsford | 03/14/2019 | ||
| 4 Old Rd, Elmsford | 2,930 | 09/08/2021 | $820,000 |