21 Knox St
Belmont, MA 02478
4 bd 5 ba 2,670 sqft Built 2005 Lot 4,987 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 | $706,000 | $663,000 | $1,369,000 | $15,593 |
| 2024 | $580,000 | $781,000 | $1,361,000 | $14,372 |
| 2023 | $463,000 | $758,000 | $1,221,000 | $13,724 |
| 2022 | $433,000 | $733,000 | $1,166,000 | $13,479 |
| 2021 | $458,000 | $864,000 | $1,322,000 | $15,256 |
| 2020 | $458,000 | $659,000 | $1,117,000 | $12,287 |
| 2019 | $491,000 | $559,000 | $1,050,000 | $12,254 |
| 2018 | $491,000 | $485,000 | $976,000 | $11,858 |
| 2016 | $488,000 | $424,000 | $912,000 | $11,455 |
| 2015 | $565,000 | $310,000 | $875,000 | $11,288 |
| 2014 | $565,000 | $266,000 | $831,000 | $11,219 |
| 2006 | $204,000 | $234,000 | $438,000 | $4,560 |
| 2005 | $196,000 | $203,000 | $399,000 | $4,265 |
| 2004 | $182,000 | $203,000 | $385,000 | $4,123 |
| 2003 | $146,000 | $190,000 | $336,000 | $3,622 |
Property facts
Year built
2005
Property type
single_family
Stories
—
Beds
4
Baths
5
Living area
2,670 sqft
Lot size
4,987 sqft
ZIP code
02478
City
Belmont
Street
Knox St
Coordinates
42.40951, -71.18053
Comparable properties nearby
Frequently asked questions
When did 21 Knox St last sell?
No public-record sale is on file for 21 Knox St.
What is the current tax assessment for 21 Knox St?
The most recent total assessment for 21 Knox St (year 2025) is $1,369,000 with $15,593 in property tax.
When was 21 Knox St built?
21 Knox St was built in 2005.
How does 21 Knox St compare to others on Knox St?
We track 1 other property on Knox St. Browse the list under "Other properties on Knox St" to compare beds, baths, and sale history.
What are the property facts for 21 Knox St?
21 Knox St is a 4 bed, 5 bath, 2,670 sqft, 4,987 sqft lot single_family.
Is 21 Knox St a flip candidate?
No — 21 Knox St does not appear in our flips dataset.
Is 21 Knox St a tax-appeal candidate?
No — 21 Knox 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
-2.9%
Implied 1-yr
-11.6%
2026 Q2
$1.2M
2026 Q3
$1.16M
ZIP 02478 — Median Price History + Forecast
Explore nearby
Geography
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