523 Union St
Portsmouth, NH 03801
3 bd 2 ba 1,239 sqft Built 1900 condo
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 | $672,900 | — | $672,900 | $7,745 |
| 2023 | $424,700 | — | $424,700 | $6,850 |
| 2022 | $424,700 | — | $424,700 | $6,455 |
| 2021 | $424,700 | — | $424,700 | $6,383 |
| 2020 | $424,700 | — | $424,700 | $6,243 |
| 2019 | $420,300 | — | $420,300 | $6,246 |
Property facts
Year built
1900
Property type
condo
Stories
3
Beds
3
Baths
2
Living area
1,239 sqft
Lot size
—
ZIP code
03801
City
Portsmouth
Street
Union St
Coordinates
43.06660, -70.76220
Comparable properties nearby
Frequently asked questions
When did 523 Union St last sell?
No public-record sale is on file for 523 Union St.
What is the current tax assessment for 523 Union St?
The most recent total assessment for 523 Union St (year 2025) is $672,900 with $7,745 in property tax.
When was 523 Union St built?
523 Union St was built in 1900.
How does 523 Union St compare to others on Union St?
We track 8 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 523 Union St?
523 Union St is a 3 bed, 2 bath, 1,239 sqft condo.
Is 523 Union St a flip candidate?
No — 523 Union St does not appear in our flips dataset.
Is 523 Union St a tax-appeal candidate?
No — 523 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
+0.5%
Implied 1-yr
+2.1%
2026 Q3
$1.3M
2026 Q4
$1.31M
ZIP 03801 — Median Price History + Forecast
Explore nearby
Geography
Other properties on Union St