Port45
South Boston, Boston · 45 W 3rd St
Port45 in South Boston, Boston has 137 recorded condominium sales dating back to 2018, a median sale price of $940K and an average of $967 per square foot. Every figure below is drawn from recorded deeds — not listings, not estimates.
Port45 is one of 1,024 condo buildings CURVE covers in South Boston, where the median recorded price is $510 per square foot. By that measure it ranks #20 of 1024 in the neighborhood.
The record
Sales activity
Recorded sales by year
Every deed recorded in Port45, by year, with that year's median price.
Sales by price point
How 137 recorded sales distribute across the price ladder.
Unit mix sold
Bedroom count across recorded sales.
10 most recent sales
| Unit | Date | Beds | Type | Price | $/SF | Change |
|---|---|---|---|---|---|---|
| 305 | 8/14/2026 | 1 Bed | Resale 2 | $760K | $1,164 | +7% |
| 406 | 6/30/2026 | 1 Bed | Resale 1 | $830K | $1,072 | +12% |
| 313 | 6/24/2026 | 2 Beds | Resale 1 | $1.4M | $960 | +5% |
| 402 | 6/15/2026 | 2 Beds | Resale 1 | $1.2M | $1,047 | +7% |
| 223 | 4/6/2026 | 2 Beds | Resale 1 | $329K | $328 | +45% |
| 415 | 3/13/2026 | 2 Beds | Resale 1 | $1.2M | $986 | +3% |
| 512 | 9/19/2025 | 2 Beds | Resale 1 | $1.4M | $996 | +4% |
| 324 | 7/10/2025 | 2 Beds | Resale 1 | $1.1M | $1,053 | +12% |
| 504 | 6/9/2025 | 1 Bed | Resale 2 | $865K | $1,137 | +3% |
| 214 | 5/30/2025 | 2 Beds | Resale 1 | $1.2M | $983 | +4% |
The full Port45 record
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About this record
Where does this data come from?
Every sale shown is a deed recorded with the Boston registry — the legal record of the transaction, not a listing or an estimate. CURVE assembles, verifies and reconciles each one to the building and the unit.
How many sales are in Port45?
137 recorded sales, going back to 2018, of which 40 are resales. This page shows the 10 most recent; members see all of them.
What has Port45 done over time?
Resales in the building have changed hands at an average of +7.8% against their prior recorded price, after an average hold of 4.1 years.
What do members see that I don't?
The complete sales table, each unit's full chain of title, buyer and seller names, financing detail, the deed book and page behind every figure, the condo documents, and reports you can send to a client.