Discover this timeless residence perched above Onset Harbor, offering panoramic bay views and unmatched tranquility. Proudly built and owned by one family, this legacy estate was crafted to endure for generations. Sited on over an acre with 6,000+ sq ft of living space, this nostalgic Cape features a grand wrap around porch, an open floor plan ideal for entertaining, plus a sunroom to relax and soak in the scenery. The chef's kitchen boasts dual stoves, sinks, and refrigerators, with a walk-in pantry for ultimate convenience. The main level offers a spacious primary ensuite, while upstairs you'll find three additional bedrooms, a guest bath, laundry room, office, and a second primary suite with private deck and dual cedar-lined walk-in closets. Every bedroom showcases captivating water views. A third-floor flex space is perfect for fitness, studio, or playroom with endless views. The 3,000 sq ft garage below offers soaring ceilings for boats, cars, or a workshop. Fenced yard, two car detached garage, steps to private beach, minutes to quaint Onset village and full service marina--this is a rare coastal retreat.
For sale
$2,990,000
12 Groveland Street, Onset, MA 02558
3beds
6,450sqft
Est.:
Single Family Residence
Built in 1997
1.07 Acres Lot
$2,867,200 Zestimate®
$464/sqft
$-- HOA
What's special
- 22 days
- on Zillow |
- 305 |
- 4 |
Zillow last checked: 7 hours ago
Listing updated: July 15, 2025 at 02:34pm
Listed by:
Danielle Rokosz 774-487-8818,
Sotheby's International Realty,
Kerrie A Marzot 508-274-2236,
Sotheby's International Realty
Source: CCIMLS,MLS#: 22503205

Travel times
Tour with a buyer's agent
Tour with a buyer's agent
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 3
- Bathrooms: 5
- Full bathrooms: 3
- 1/2 bathrooms: 2
Heating
- Has Heating (Unspecified Type)
Cooling
- Other
Appliances
- Included: Gas Water Heater
Features
- Flooring: Hardwood, Tile
- Basement: Interior Entry
- Has fireplace: No
Interior area
- Total structure area: 6,450
- Total interior livable area: 6,450 sqft
Property
Parking
- Total spaces: 6
- Parking features: Basement
- Garage spaces: 6
Features
- Stories: 3
- Has view: Yes
- Has water view: Yes
- Water view: Bay/Harbor
- Body of water: Onset Bay
Lot
- Size: 1.07 Acres
Details
- Parcel number: 398B
- Zoning: MR30
- Special conditions: Standard
Construction
Type & style
- Home type: SingleFamily
- Property subtype: Single Family Residence
Materials
- Foundation: Concrete Perimeter, Poured
- Roof: Asphalt, Pitched
Condition
- Approximate
- New construction: No
- Year built: 1997
Utilities & green energy
- Sewer: Public Sewer
Community & HOA
HOA
- Has HOA: No
Location
- Region: Buzzards Bay
Financial & listing details
- Price per square foot: $464/sqft
- Tax assessed value: $2,048,300
- Annual tax amount: $17,512
- Date on market: 7/8/2025
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