Observer
Building report · Winthrop Highlands, Winthrop

3 Seal Harbor Rd

Winthrop, MA 02152

6 condos sold at 3 Seal Harbor Rd in the past 12 months, for a typical $631K, or $506 a square foot. Right now, 3 are for sale.

  • 1987 built
  • 117 units
  • 9 floors with homes
  • #109 in Greater Boston by condo sales
3 Seal Harbor Rd, Unit PH33: listing photo
Unit PH33, for sale at $1,230,000. Listed by Cathie Curran, Charlesgate Realty Group, llc. MLS #73560746.
$631K
typical sale price, past 12 months
$506
per square foot
37 days
typical time to an accepted offer
0%
sold for asking or more
3
for sale now
$842
typical monthly condo fee

For sale now3 units, 2.6% of the building

  • Unit PH33: listing photo

    $1,230,000

    Unit PH33, floor 9

    3 bed · 3 bath · 1,913 sq ft

    $643/sq ft · 95 days listed · $1,798/mo fee

    Active · Condo · MLS #73560746
    3 Seal Harbor Rd #PH33, Winthrop, MA
    Listed by Cathie Curran, Charlesgate Realty Group, llc

  • Unit 336: listing photo

    $789,900Cut $70K

    Unit 336, floor 3

    2 bed · 1.5 bath · 1,674 sq ft

    $472/sq ft · 109 days listed

    Active · Condo · MLS #73554136
    3 Seal Harbor #336, Winthrop, MA
    Listed by Cathie Curran, Charlesgate Realty Group, llc

  • Unit 632: listing photo

    $639,000

    Unit 632, floor 6

    1 bed · 2 bath · 1,263 sq ft

    $506/sq ft · 61 days listed · $835/mo fee

    Active · Condo · MLS #73573980
    3 Seal Harbor Rd #632, Winthrop, MA
    Listed by Mark Carangelo, Mark Carangelo

What soldPast 12 months, newest first

ClosedUnitSizePrice$/sq ftvs. first ask
Oct 23Unit 342MLS #73506354 · Redfin Corp.2 bed, 1,302 sq ft$623,000$478−8.2%
May 19Unit 133MLS #73485345 · Lyv Realty1 bed, 910 sq ft$630,000$692−3.1%
May 7Unit 344MLS #73480701 · Mark Carangelo2 bed, 1,302 sq ft$632,000$485−2.6%
Apr 3Unit 634MLS #73495543 · Mark Carangelo1 bed, 840 sq ft$515,000$613−1.9%
Mar 2Unit 137MLS #73446481 · Lyv Realty2 bed, 1,327 sq ft$670,000$505−10.7%
Dec 8Unit 736MLS #73452959 · Lyv Realty3 bed, 1,674 sq ft$850,000$508−5.6%

Where it isWith nearby buildings we track

Questions people ask

How much do condos cost at 3 Seal Harbor Rd?
In the past 12 months, 6 condos sold at 3 Seal Harbor Rd (3 Seal Harbor Rd, Winthrop) for a typical $631,000, or $506 per square foot. Sales ranged from $515,000 to $850,000.
How fast do condos sell at 3 Seal Harbor Rd?
Units that sold in the past 12 months took a typical 37 days to get an accepted offer, and 0% sold for their first asking price or more. In Winthrop Highlands overall, it took 30 days.
What are the condo fees at 3 Seal Harbor Rd?
The typical monthly condo fee at 3 Seal Harbor Rd is $842, about $0.71 per square foot a month, based on the fees filed with its listings.
How many condos are for sale at 3 Seal Harbor Rd right now?
3 units are for sale, asking from $639,000 to $1,230,000.
When was 3 Seal Harbor Rd built, and how many units does it have?
3 Seal Harbor Rd was built in 1987 and has 117 units, with homes up to the 9th floor, according to its listings.

About these numbers

Every figure on this page comes from verified market data for 3 Seal Harbor Rd, Winthrop, refreshed November 8, 2026, and updates every morning. “Typical” means the median. Price per square foot uses the living area filed with each listing. Condo fees are monthly. Sales history in our data starts in late 2025.

Cite as: “3 Seal Harbor Rd building report,” Boston Real Estate Observer, https://bostonrealestateobserver.com/buildings/winthrop/3-seal-harbor-rd/ (data as of November 8, 2026).