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Cambridgeport Mansard

$1,100,000 20 Cottage Street Unit 2, Cambridge, MA 02139

Exquisite 1870s Mansard style home offering beautifully restored period architectural detail—original pine wide plank wood flooring, high ceilings, and large arched windows. This spacious 1250 square foot top floor duplex home has 2+ beds and 1.5 baths. The first living level contains the kitchen, dining room, living room, ½ bath, and two large storage closets. There is a nice sized landing great for an office nook leading to the top floor with two large bedrooms, full bath, washer and dryer closet and a bonus room currently being used as a walk-in closet but could be an office or nursery. Other features include, 2023 heating system, basement storage, attic storage and roof rights. A welcoming front porch and a shared patio along the side garden offers wonderful outdoor spaces. Sited on a Leafy side street, just a few blocks to the Central Square Red Line T, close to Harvard and MIT with easy access to Boston and Longwood Medical—this is an ideal Cambridgeport location.

Unit Details:

  • Living Area: 1,250 square feet
  • Top floor duplex
  • 6 rooms, 2+ bedrooms, 1 full bath, 1 half bath
  • Built approximately 1875, Converted in 1998

The curb appeal of this home is incredible—gorgeous restored 1870s Mansard with an inviting farmers porch.You are welcomed into the building through thick solid wood double doors into a generous central foyer with original carved wood staircase and high ceilings.


  • Upon entering there is a hall coat closet and an additional double storage closet. The living room has four front and side facing windows providing a sunny exposure and views of the beautiful mature neighborhood trees.  There is pine wide plank wood flooring throughout and high ceilings.
  • The dining room has two side facing sunny windows and a french door that opens to a spiral staircase taking you to the shared outside patio.
  • The kitchen has natural wood shaker-style cabinets with granite counters. All appliances are stainless GE, 5-burner gas stove, microwave, dishwasher and french door refrigerator with a bottom freezer.
  • There is a ½ bath/powder room on this level.
  • The landing that leads to the top floor has a large window creating an ideal office nook.
  • The spacious primary bedroom has two large arched windows, ceiling fan and two large closets. 
  • The second bedroom is equally as large also with two arched windows and a double closet.
  • There is a small room with a window that is being used as a walk-in closet but is versatile for an office or nursery. 
  • The full bathroom has a tub/shower with tile surround, pedestal sink, linen closet and large arched window.
  • The hall closet has a stacked Maytag washer/dryer and storage.

Systems & Storage:

  • Heat: New 2023 Carrier forced hot air by gas. Installed and maintained by Sila.
  • Cooling: Ceiling fans and window units (there is duct work for future central A/C)
  • Water Heater: Rheem 10yr 40 gallon, installed in 2019
  • Electrical: 100 amps circuit breakers. 
  • Basement Storage: left half of basement
  • Attic Storage

Exterior and Property:

  • Windows: Original restored “wavy glass” with storm windows and screens
  • Roof: Slate maintained and shingles replaced as needed. One area is flat rubber roofing, age unknown
  • Siding: Wood clapboard, left side and back of house painted in 2021
  • Outdoor Spaces: Landscaped front and right side yard. Shared farmers porch and patio along the side yard.
  • Roof Rights: The condo docs gives unit #2 roof rights to build a roof deck with plan approvals from unit 1.  The City of Cambridge approvals and permits would be needed.

 Condo Association & Financial Information:

  • Owner-Occupancy: 2-unit self-managed association, unit 1 has been rented by the same tenant for the past 3 years.
  • Condo Fee: $300/month, which includes master insurance, water & sewer, exterior maintenance, landscaping, common electric, and capital reserve.
  • Condo Account: $3,700 in the account as of March 1st, 2023.
  • Beneficial Interest: 50%
  • Pets: 1 pet is allowed.
  • Rentals: Cannot be for less than 9 months. 
  • Taxes: $3,429.33 FY23 (which includes a discount of $2,8341 for the Residential Exemption) Assessed value $1,041,900





  • Sold
  • 2
  • 1.5
  • 1,250 Sq.Ft.
    Living Area

Features & Amenities

Area & Lot

  • Status: Sold
  • Living Space: 1,250 Sq.Ft.
  • Type: Condo
  • Neighborhood: Cambridge


  • Total Bedrooms: 2
  • Total Bathrooms: 1.5
  • Laundry Room: in-unit

Exterior & Building

  • Stories: 2


  • Sales Price: $1,100,000
  • HOA Fees: $300/mo
Property Insight

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Cambridgeport Mansard

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