18 Union St
Boston, MA 02129
2 bd 1 ba 776 sqft Built 1905 condos
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 | $564,300 | — | $564,300 | $6,535 |
| 2024 | $542,400 | — | $542,400 | $5,912 |
| 2023 | $516,100 | — | $516,100 | $5,543 |
| 2022 | $496,200 | — | $496,200 | $5,399 |
| 2021 | $486,400 | — | $486,400 | $5,190 |
| 2020 | $513,700 | — | $513,700 | $5,425 |
| 2019 | $479,900 | — | $479,900 | $5,058 |
| 2018 | $457,100 | — | $457,100 | $4,790 |
| 2017 | $443,600 | — | $443,600 | $4,698 |
| 2016 | $422,500 | — | $422,500 | $4,648 |
| 2015 | $346,900 | — | $346,900 | $4,201 |
| 2014 | $308,900 | — | $308,900 | $3,886 |
| 2006 | $264,400 | — | $264,400 | $2,940 |
| 2005 | $270,400 | — | $270,400 | $2,901 |
| 2004 | $245,200 | — | $245,200 | $2,489 |
Property facts
Year built
1905
Property type
condos
Stories
—
Beds
2
Baths
1
Living area
776 sqft
Lot size
—
ZIP code
02129
City
Boston
Street
Union St
Coordinates
42.37448, -71.06439
Comparable properties nearby
Frequently asked questions
When did 18 Union St last sell?
No public-record sale is on file for 18 Union St.
What is the current tax assessment for 18 Union St?
The most recent total assessment for 18 Union St (year 2025) is $564,300 with $6,535 in property tax.
When was 18 Union St built?
18 Union St was built in 1905.
How does 18 Union St compare to others on Union St?
We track 6 other properties on Union St. Browse the list under "Other properties on Union St" to compare beds, baths, and sale history.
What are the property facts for 18 Union St?
18 Union St is a 2 bed, 1 bath, 776 sqft condos.
Is 18 Union St a flip candidate?
No — 18 Union St does not appear in our flips dataset.
Is 18 Union St a tax-appeal candidate?
No — 18 Union 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
-2.0%
Implied 1-yr
-8.2%
2026 Q3
$977.9K
2026 Q4
$954.8K
ZIP 02129 — Median Price History + Forecast
Explore nearby
Geography
Other properties on Union St