21 Frederick St
Mahopac, NY 10541
2 bd — ba 640 sqft Built 1921 Lot 30,928 sqft single_family
No recorded sales
Location
Timeline: Sale, Listing & Tax History
Recorded events
No recorded events
No sale or listing events are on file for this property.
Tax assessment history
| Year | Building | Land | Total assessed | Tax paid |
|---|---|---|---|---|
| 2025 | $35,600 | $116,400 | $152,000 | $4,240 |
| 2024 | $18,100 | $116,400 | $134,500 | $3,980 |
| 2023 | $7,400 | $105,800 | $113,200 | $3,857 |
| 2022 | $4,100 | $105,800 | $109,900 | $3,786 |
| 2021 | — | $70,500 | $70,500 | $3,387 |
| 2020 | — | $70,500 | $70,500 | $2,527 |
| 2017 | — | $70,500 | $70,500 | $2,538 |
| 2016 | — | $70,500 | $70,500 | $3,983 |
| 2015 | $37,900 | $28,000 | $65,900 | $3,971 |
| 2014 | $37,900 | $28,000 | $65,900 | $3,816 |
| 2013 | $37,900 | $28,000 | $65,900 | $3,749 |
| 2012 | $37,900 | $28,000 | $65,900 | $3,303 |
| 2011 | $37,900 | $28,000 | $65,900 | $776 |
| 2010 | $37,900 | $28,000 | $65,900 | $765 |
| 2009 | $37,900 | $28,000 | $65,900 | $722 |
| 2007 | $37,900 | $28,000 | $65,900 | $699 |
Property facts
Year built
1921
Property type
single_family
Stories
1
Beds
2
Baths
—
Living area
640 sqft
Lot size
30,928 sqft
ZIP code
10541
City
Mahopac
Street
Frederick St
Coordinates
41.38237, -73.74940
Comparable properties nearby
Block-level micro-comps
Same street, ±3 house numbers, sold in the last 24 monthsFrequently asked questions
When did 21 Frederick St last sell?
No public-record sale is on file for 21 Frederick St.
What is the current tax assessment for 21 Frederick St?
The most recent total assessment for 21 Frederick St (year 2025) is $152,000 with $4,240 in property tax.
When was 21 Frederick St built?
21 Frederick St was built in 1921.
How does 21 Frederick St compare to others on Frederick St?
We track 2 other properties on Frederick St. Browse the list under "Other properties on Frederick St" to compare beds, baths, and sale history.
What are the property facts for 21 Frederick St?
21 Frederick St is a 2 bed, — bath, 640 sqft, 30,928 sqft lot single_family.
Is 21 Frederick St a flip candidate?
No — 21 Frederick St does not appear in our flips dataset.
Is 21 Frederick St a tax-appeal candidate?
No — 21 Frederick St is not currently flagged as a tax-appeal candidate.
Forecast for this area
ZIP-area linear projection — not a per-property automated valuationQuarterly trend
+3.2%
Implied 1-yr
+12.8%
2026 Q3
$696.8K
2026 Q4
$715.3K
ZIP 10541 — Median Price History + Forecast
Explore nearby
Geography
Other properties on Frederick St