20 Union Park
South End, Boston · 20 Union Park
20 Union Park in South End, Boston has 19 recorded condominium sales dating back to 1978, a median sale price of $469K and an average of $498 per square foot. Every figure below is drawn from recorded deeds — not listings, not estimates.
20 Union Park 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 #557 of 577 in the neighborhood.
The record
Sales activity
Recorded sales by year
Every deed recorded in 20 Union Park, by year, with that year's median price.
Sales by price point
How 19 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 |
|---|---|---|---|---|---|---|
| 5 | 3/31/2025 | 1 Bed | Resale 7 | $1.3M | $1,291 | +20% |
| 1 | 9/29/2020 | 1 Bed | Resale 2 | $1.2M | $1,038 | +302% |
| 5 | 7/30/2018 | 1 Bed | Resale 6 | $1.1M | $1,072 | +81% |
| 3 | 4/21/2015 | 1 Bed | Resale 1 | $779K | $959 | +1631% |
| 4 | 8/15/2014 | 2 Beds | Resale 3 | $772K | $941 | +44% |
| 5 | 1/21/2010 | 1 Bed | Resale 5 | $607K | $591 | -5% |
| 4 | 6/30/2009 | 2 Beds | Resale 2 | $537K | $655 | +114% |
| 5 | 8/13/2004 | 1 Bed | Resale 4 | $638K | $622 | +23% |
| 5 | 1/26/2004 | 1 Bed | Resale 3 | $520K | $507 | +11% |
| 5 | 8/16/2000 | 1 Bed | Resale 2 | $469K | $457 | +55% |
The full 20 Union Park record
You are seeing the summary. Members see the deeds.
No credit card required.
More buildings in South End
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 20 Union Park?
19 recorded sales, going back to 1978, of which 14 are resales. This page shows the 10 most recent; members see all of them.
What has 20 Union Park done over time?
Resales in the building have changed hands at an average of +291.9% against their prior recorded price, after an average hold of 12.6 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.