The Cosmopolitan
South End, Boston · 771 Harrison Ave
The Cosmopolitan in South End, Boston has 47 recorded condominium sales dating back to 2021, a median sale price of $900K and an average of $864 per square foot. Every figure below is drawn from recorded deeds — not listings, not estimates.
The Cosmopolitan is one of 578 condo buildings CURVE covers in South End, where the median recorded price is $699 per square foot. By that measure it ranks #128 of 577 in the neighborhood.
The record
Sales activity
Recorded sales by year
Every deed recorded in The Cosmopolitan, by year, with that year's median price.
Sales by price point
How 47 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 |
|---|---|---|---|---|---|---|
| 308 | 4/3/2025 | 1 Bed | Resale 1 | $949K | $1,015 | +3% |
| 103 | 3/4/2025 | 1 Bed | Resale 1 | $668K | $796 | -1% |
| 101 | 8/1/2024 | 1 Bed | Developer Sale | $730K | $853 | — |
| 109 | 6/12/2024 | 1 Bed | Resale 1 | $885K | $941 | +14% |
| G7 | 5/30/2024 | 1 Bed | Developer Sale | $695K | $753 | — |
| PH-9 | 2/27/2024 | 2 Beds | Developer Sale | $1.6M | $668 | — |
| PH-3 | 10/18/2023 | 2 Beds | Developer Sale | $1.6M | $629 | — |
| PH-10 | 8/17/2023 | 2 Beds | Developer Sale | $1.6M | $637 | — |
| PH-2 | 8/17/2023 | 2 Beds | Developer Sale | $1.6M | $637 | — |
| 208 | 7/18/2023 | 1 Bed | Resale 1 | $855K | $914 | 0% |
The full Cosmopolitan 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 The Cosmopolitan?
47 recorded sales, going back to 2021, of which 4 are resales. This page shows the 10 most recent; members see all of them.
What has The Cosmopolitan done over time?
Resales in the building have changed hands at an average of +4.0% against their prior recorded price, after an average hold of 3.3 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.