21 Walnut St
Watertown, MA 02472
7 bd 3 ba 5,000 sqft Built 1917 Lot 12,197 sqft multi_family
Most recent sale
$1,850,000
May 31, 2022
Location
Timeline: Sale, Listing & Tax History
Recorded events
| Date | Event | Price | Source |
|---|---|---|---|
| Oct 22, 2024 | Listing removed | $4,500,000 | MLSPIN |
| Jul 18, 2024 | Listed | $4,500,000 | MLSPIN |
| May 31, 2022 | Sold | $1,850,000 | MLS #72959570 |
| Mar 30, 2022 | Listed | $1,675,000 | MLS #72959570 |
| Mar 24, 2006 | Sold | $1,041,000 | MLS #70285145 |
| Oct 27, 2005 | Listed | $1,150,000 | MLS #70285145 |
| Jun 2, 1997 | Sold | $108,000 | Public Record |
Tax assessment history
| Year | Building | Land | Total assessed | Tax paid |
|---|---|---|---|---|
| 2025 | $1,122,700 | $663,100 | $1,785,800 | $20,858 |
| 2024 | $1,019,300 | $648,200 | $1,667,500 | $19,510 |
| 2023 | $758,500 | $539,900 | $1,298,400 | $17,632 |
| 2022 | $765,100 | $489,800 | $1,254,900 | $16,627 |
| 2021 | $738,700 | $473,600 | $1,212,300 | $14,851 |
| 2020 | $723,300 | $457,300 | $1,180,600 | $14,332 |
| 2019 | $606,200 | $457,300 | $1,063,500 | $13,698 |
| 2018 | $550,000 | $424,900 | $974,900 | $13,132 |
| 2017 | $550,000 | $372,200 | $922,200 | $12,809 |
| 2016 | $550,000 | $351,900 | $901,900 | $12,338 |
| 2015 | $413,500 | $311,300 | $724,800 | $10,894 |
| 2013 | $413,500 | $291,000 | $704,500 | $10,342 |
| 2006 | $402,200 | $305,000 | $707,200 | $7,899 |
| 2005 | $472,600 | $200,300 | $672,900 | $7,341 |
| 2004 | $436,500 | $194,100 | $630,600 | $6,527 |
| 2003 | $316,400 | $160,500 | $476,900 | $6,033 |
Property facts
Year built
1917
Property type
multi_family
Stories
3
Beds
7
Baths
3
Living area
5,000 sqft
Lot size
12,197 sqft
ZIP code
02472
City
Watertown
Street
Walnut St
Coordinates
42.36821, -71.17384
Comparable properties nearby
Investment analysis
Estimates based on local averages — not personalized adviceEstimated monthly rent
$14,500
Gross rental yield
9.41%
Implied cap rate
6.11%
Trend-extrapolated value
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Frequently asked questions
When did 21 Walnut St last sell?
21 Walnut St most recently sold on May 31, 2022 for $1,850,000.
What is the current tax assessment for 21 Walnut St?
The most recent total assessment for 21 Walnut St (year 2025) is $1,785,800 with $20,858 in property tax.
How does 21 Walnut St's assessment compare to its last sale price?
The current assessment is 3.5% below the last sale price of $1,850,000.
When was 21 Walnut St built?
21 Walnut St was built in 1917.
How does 21 Walnut St compare to others on Walnut St?
We track 7 other properties on Walnut St. Browse the list under "Other properties on Walnut St" to compare beds, baths, and sale history.
What are the property facts for 21 Walnut St?
21 Walnut St is a 7 bed, 3 bath, 5,000 sqft, 12,197 sqft lot multi_family.
Is 21 Walnut St a flip candidate?
No — 21 Walnut St does not appear in our flips dataset.
Is 21 Walnut St a tax-appeal candidate?
No — 21 Walnut 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
+0.8%
Implied 1-yr
+3.2%
2026 Q3
$1.01M
2026 Q4
$1.02M
ZIP 02472 — Median Price History + Forecast
Explore nearby
Geography
Other properties on Walnut St