Seal Harbor
3 Seal Harbor Rd, Winthrop, MA 02152
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Independent brokerage page. BMN Boston Real Estate compiles public MLS listing and sales data for Seal Harbor; it is not the building's management company, leasing office, or HOA. Contact Seal Harbor directly for management, rental, or maintenance questions.
About Seal Harbor
Seal Harbor is Winthrop's landmark waterfront condominium community on Seal Harbor Road, where one- to three-bedroom residences range from about 840 to 2,240 square feet and recent prices run from $500K to the low $900Ks. The complex is among the most actively traded on the peninsula — twenty-six units tracked, with sales averaging about two and a half months on market. Fees ($588–$1,404) cover sewer, master insurance, and structure, with under-building and deeded parking. Winthrop delivers shoreline living minutes from Logan and downtown Boston.
Seal Harbor is a residential building built in 1983, located at 3 Seal Harbor Rd in Winthrop, MA 02152. The building features 1 to 3-bedroom residences ranging from 838 to 2,236 square feet , with prices from $490K to $1.2M . There are currently 7 units available for sale. 22 units have sold in the last two years at an average price of $643K .
Monthly HOA fees at Seal Harbor range from $588 to $1,798 per month and commonly include Sewer, Insurance, Maintenance Structure . Parking is typically under, off street, common, averaging 1.7 spaces per unit.
Last updated: 2026-08-21
7 Units For Sale at Seal Harbor
Unit Types at Seal Harbor
| Unit Type | Beds | Baths | Sq Ft | Price Range | Available |
|---|---|---|---|---|---|
| 1 Bedroom | 1 | 1 | 838 - 1,005 sqft | $265K - $630K | 1 for sale |
| 1 Bedroom | 1 | 2 | 1,033 - 1,263 sqft | $320K - $650K | 1 for sale |
| 2 Bedroom | 2 | 2 | 1,124 - 1,674 sqft | $385K - $860K | 5 for sale |
| 2 Bedroom | 2 | 3 | 1,634 - 1,809 sqft | $550K - $929K | 5 for sale |
| 3 Bedroom | 3 | 3 | 1,674 - 2,236 sqft | $508K - $1.2M | 1 for sale |
1 Unit Under Agreement
Recently Sold at Seal Harbor
| Address | Beds/Baths | Sq Ft | List Price | Sold Price | Change | Sold Date |
|---|---|---|---|---|---|---|
| 1 Seal Harbor Rd # 401, Winthrop MA 02152 | 1bd / 1ba | 1,005 | $575K | $575K | +0% | Jun 22, 2026 |
| 3 Seal Harbor Rd # 133, Winthrop MA 02152 | 1bd / 1ba | 910 | $650K | $630K | -3.1% | May 18, 2026 |
| 1 Seal Harbor Rd # 701, Winthrop MA 02152 | 1bd / 1ba | 1,005 | $549K | $549K | +0% | May 14, 2026 |
| 3 Seal Harbor # 344, Winthrop MA 02152 | 2bd / 2ba | 1,302 | $649K | $632K | -2.6% | May 6, 2026 |
| 3 Seal Harbor Rd # 634, Winthrop MA 02152 | 1bd / 1ba | 840 | $525K | $515K | -1.9% | Apr 2, 2026 |
| 3 Seal Harbor Rd # 137, Winthrop MA 02152 | 2bd / 2ba | 1,327 | $686K | $670K | -2.3% | Mar 1, 2026 |
| 3 Seal Harbor Rd # 736, Winthrop MA 02152 | 3bd / 2.5ba | 1,674 | $900K | $850K | -5.6% | Dec 7, 2025 |
| 1 Seal Harbor Rd # 215, Winthrop MA 02152 | 2bd / 2ba | 1,203 | $599K | $550K | -8.2% | Oct 27, 2025 |
| One Seal Harbor Rd # 604, Winthrop MA 02152 | 2bd / 2ba | 1,124 | $649K | $650K | +0.2% | Sep 29, 2025 |
| 3 Seal Harbor Road # 744, Winthrop MA 02152 | 2bd / 2ba | 1,302 | $796K | $725K | -8.9% | Aug 6, 2025 |
| 3 Seal Harbor # 242, Winthrop MA 02152 | 2bd / 2ba | 1,302 | $668K | $660K | -1.2% | Jul 24, 2025 |
| 3 Seal Harbor, Winthrop MA 02152 | 2bd / 2.5ba | 1,777 | $929K | $929K | +0% | Jul 23, 2025 |
| 1 Seal Harbor Rd # 104, Winthrop MA 02152 | 2bd / 2ba | 1,230 | $619K | $595K | -3.9% | Apr 27, 2025 |
| 3 Seal Harbor Rd # 234, Winthrop MA 02152 | 1bd / 1ba | 890 | $525K | $523K | -0.5% | Apr 17, 2025 |
| 3 Seal Harbor # 846, Winthrop MA 02152 | 1bd / 1.5ba | 1,106 | $575K | $550K | -4.3% | Mar 9, 2025 |
| 3 Seal Harbor # 635, Winthrop MA 02152 | 2bd / 2ba | 1,306 | $600K | $590K | -1.7% | Feb 18, 2025 |
| 3 Seal Harbor # 733, Winthrop MA 02152 | 2bd / 2ba | 1,286 | $675K | $675K | +0% | Feb 3, 2025 |
| 1 Seal Harbor Rd # 514, Winthrop MA 02152 | 2bd / 2ba | 1,327 | $599K | $560K | -6.5% | Jan 30, 2025 |
| 3 Seal Harbor Rd # 232, Winthrop MA 02152 | 1bd / 2ba | 1,263 | $638K | $650K | +1.9% | Dec 22, 2024 |
| 3 Seal Harbor # 644, Winthrop MA 02152 | 2bd / 2ba | 1,302 | $689K | $711K | +3.2% | Dec 18, 2024 |
| 1 Seal Harbor # 513, Winthrop MA 02152 | 2bd / 2ba | 1,205 | $630K | $624K | -1% | Aug 30, 2024 |
| 1 Seal Harbor Rd # 403, Winthrop MA 02152 | 2bd / 2ba | 1,190 | $718K | $725K | +1% | Aug 21, 2024 |
Frequently Asked Questions About Seal Harbor
Is BMN Boston Real Estate the management company or leasing office for Seal Harbor?
No. BMN Boston Real Estate is an independent real estate brokerage. We compile public MLS listing and recent-sales data for Seal Harbor to help buyers and sellers make informed decisions. We do not manage the building, lease units on behalf of the owner, or handle HOA matters. For management, leasing, or maintenance inquiries, please contact Seal Harbor directly.
How many units are for sale at Seal Harbor?
There are currently 7 condos for sale at Seal Harbor in Winthrop, MA. Prices range from $490K - $1.2M.
What is the price range at Seal Harbor?
Prices at Seal Harbor range from $490K to $1.2M based on recent listings and sales. Prices vary by unit size, floor, and finishes.
What are the unit sizes at Seal Harbor?
Units at Seal Harbor range from 838 to 2,236 square feet, with 1 to 3 bedroom configurations.
How much do condos sell for at Seal Harbor?
22 units have sold at Seal Harbor in the last two years at an average price of $643K. The average time on market was 74 days.
When was Seal Harbor built?
Seal Harbor was built in 1983 and is located at 3 Seal Harbor Rd in Winthrop, MA 02152.
What are the HOA fees at Seal Harbor?
Monthly HOA fees at Seal Harbor $588 to $1,798 per month. Based on 30 listings with HOA data on file. Fees commonly include Sewer, Insurance, Maintenance Structure. Actual fees vary by unit; confirm with the listing agent.
Is parking available at Seal Harbor?
Parking at Seal Harbor is typically described as under, off street, common. On average, listings include 1.7 parking spaces. Specific arrangements (deeded, assigned, garage vs. surface) vary by unit.
Looking to Buy or Tour at Seal Harbor?
BMN Boston Real Estate is a real estate brokerage that tracks every MLS listing at Seal Harbor. Schedule a tour, ask about a specific unit, or get instant alerts when new listings hit the market — download the app or browse all listings below.
Trying to reach the building's management or leasing office? Search "Seal Harbor Winthrop management" — we are not affiliated with the building's management.
