Echelon Seaport
Seaport, Boston · 133 + 135 Seaport Blvd
Echelon Seaport in Seaport, Boston has 515 recorded condominium sales dating back to 2019, a median sale price of $1.6M and an average of $1,691 per square foot. Every figure below is drawn from recorded deeds — not listings, not estimates.
Echelon Seaport is one of 6 condo buildings CURVE covers in Seaport, where the median recorded price is $1,690 per square foot. By that measure it ranks #4 of 6 in the neighborhood.
The record
Sales activity
Recorded sales by year
Every deed recorded in Echelon Seaport, by year, with that year's median price.
Sales by price point
How 515 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 |
|---|---|---|---|---|---|---|
| 133-1510 | 8/6/2026 | 1 Bed | Resale 1 | $1.3M | $1,630 | -7% |
| 133-1510 | 8/6/2026 | 1 Bed | Resale 1 | $1.3M | $1,630 | -7% |
| 135-1203 | 7/31/2026 | 1 Bed | Resale 2 | $1.3M | $1,459 | -3% |
| 135-1203 | 7/31/2026 | 1 Bed | Resale 2 | $1.3M | $1,459 | -3% |
| 133-2003 | 7/28/2026 | 1 Bed | Developer Sale | $1.3M | $1,629 | — |
| 133-2003 | 7/28/2026 | 1 Bed | Developer Sale | $1.3M | $1,629 | — |
| 133-803 | 7/10/2026 | 2 Beds | Resale 1 | $1.7M | $1,571 | +7% |
| 133-1112 | 5/22/2026 | 1 Bed | Resale 1 | $1.1M | $1,570 | -8% |
| 133-1017 | 5/18/2026 | 2 Beds | Resale 1 | $1.5M | $1,447 | -4% |
| 135-1718 | 5/14/2026 | Studio | Developer Sale | $899K | $1,777 | — |
The full Echelon Seaport 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 Echelon Seaport?
515 recorded sales, going back to 2019, of which 77 are resales. This page shows the 10 most recent; members see all of them.
What has Echelon Seaport done over time?
Resales in the building have changed hands at an average of +1.8% against their prior recorded price, after an average hold of 3.7 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.