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South Boston, Boston · Condominium Association

Castle Bay Condominiums

A 20-unit condominium community in South Boston, Boston.

Median Sale
$5k
Price / Sq Ft
$368
Avg Days on Mkt
26 days
Sold
25
HOA Range
$172–476/mo
Total Units
20

Market figures reflect closed sales over the last 12 months. Data sourced from MLS PIN.

Homes for Sale in Castle Bay

Overview

Castle Bay Condominium is a 20-unit condominium association in Boston, Massachusetts (South Boston). Over recent sales, units sold at a median of $825,000 (about $442 per square foot).

Contact Justin Rollo for the latest availability, recent sales, and condo-fee details for Castle Bay Condominium.

Recent Sales

Sold Oct 2026784 East 4th
$1.0m
784 East 4th #1
3 bd2 ba1,545 sqft
22 days on market
Compass
Sold Oct 2026656 E 7th St
$3,900
656 E 7th St #3
1 bd1 ba714 sqft
4 days on market
Compass
Sold Sep 20261 Leonard Place
$1.0m
1 Leonard Place #3
2 bd2 ba1,163 sqft
85 days on market
RE/MAX Platinum
Sold Sep 2026150-1/2 M St
$3,750
150-1/2 M St #3
2 bd1 ba771 sqft
16 days on market
Boston Green Realty
Sold Aug 2026150 M St
$730,000
150 M St #2
2 bd2 ba873 sqft
39 days on market
Real Broker MA, LLC
Sold Aug 20265 Flint Pl
$950,000
5 Flint Pl #1
2 bd2 ba1,421 sqft
23 days on market
Coldwell Banker Realty - Boston

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About Your Castle Bay Expert

JR

Justin Rollo

Castle Bay Condominium Specialist · Signal Real Estate

Justin Rollo is a Massachusetts real estate expert with over a decade of experience and hundreds of South Shore transactions. He tracks every sale, pending, and price movement inside Castle Bay — so whether you're buying into the community or thinking about selling, you're working with someone who knows this specific association inside and out.

Ask Justin about Castle Bay →

Frequently Asked Questions

How much are condos at Castle Bay Condominium selling for?

Over recent sales, units at Castle Bay Condominium sold at a median of $825,000, about $442 per square foot.

How many units are in Castle Bay Condominium?

Castle Bay Condominium is a 20-unit condominium association in Boston, MA.

How fast do condos sell at Castle Bay Condominium?

Recent sales at Castle Bay Condominium averaged about 19 days on market, with 1 closings in the period.