Charming 3-bedroom Cape in a convenient Portland location! Sun-filled rooms highlight gleaming hardwood floors throughout, with a desirable first-floor bedroom option. The finished basement offers flexible space for a family room, office, or guest area. Enjoy a shaded backyard perfect for relaxing or entertaining, plus a one-car garage for added storage and convenience. Close to shopping, dining, and easy access to Westbrook.
Closed
$425,000
21 Castine Avenue, Portland, ME 04103
3beds
1,735sqft
Single Family Residence
Built in 1955
5,662.8 Square Feet Lot
$450,900 Zestimate®
$245/sqft
$3,191 Estimated rent
Home value
$450,900
$428,000 - $473,000
$3,191/mo
Zestimate® history
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What's special
Zillow last checked: 8 hours ago
Listing updated: December 14, 2025 at 07:44am
Listed by:
The Maine Real Estate Group
Bought with:
F.O. Bailey Real Estate
Source: Maine Listings,MLS#: 1639706
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 3
- Bathrooms: 1
- Full bathrooms: 1
Bedroom 1
- Level: First
Bedroom 2
- Level: Second
Bedroom 3
- Level: Second
Bonus room
- Level: Basement
Dining room
- Level: First
Kitchen
- Level: First
Living room
- Level: First
Heating
- Baseboard, Hot Water, Zoned, Wood Stove
Cooling
- None
Features
- Flooring: Carpet, Laminate, Wood
- Basement: Bulkhead,Interior Entry
- Has fireplace: No
Interior area
- Total structure area: 1,735
- Total interior livable area: 1,735 sqft
- Finished area above ground: 1,032
- Finished area below ground: 703
Property
Parking
- Total spaces: 1
- Parking features: Garage
- Garage spaces: 1
Features
- Levels: Multi/Split
- Patio & porch: Patio
- Has view: Yes
- View description: Trees/Woods
Lot
- Size: 5,662 sqft
Details
- Parcel number: PTLDM309BD007001
- Zoning: Residential
Construction
Type & style
- Home type: SingleFamily
- Architectural style: Cape Cod
- Property subtype: Single Family Residence
Materials
- Roof: Pitched,Shingle
Condition
- Year built: 1955
Utilities & green energy
- Electric: Circuit Breakers
- Sewer: Public Sewer
- Water: Public
Community & neighborhood
Location
- Region: Portland
Price history
| Date | Event | Price |
|---|---|---|
| 12/8/2025 | Sold | $425,000-7.4%$245/sqft |
Source:  Maine Listings #1639706 | ||
| 10/23/2025 | Pending sale | $459,000$265/sqft |
Source: Maine Listings #1639706 | ||
| 10/11/2025 | Price change | $459,000-4.4%$265/sqft |
Source: Maine Listings #1639706 | ||
| 10/3/2025 | Listed for sale | $480,000+166.8%$277/sqft |
Source: Maine Listings #1639706 | ||
| 4/22/2014 | Listing removed | $179,900$104/sqft |
Source: Coldwell Banker Residential Brokerage - Portland #1128105 | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2024 | $4,163 | $288,900 |
| 2023 | $4,163 +5.9% | $288,900 |
| 2022 | $3,932 -1.9% | $288,900 +68.1% |
Find assessor info on the county website
Neighborhood: Riverton
Nearby schools
GreatSchools rating
- 3/10Gerald E Talbot Community SchoolGrades: PK-5Distance: 0.4 mi
- 6/10Lincoln Middle SchoolGrades: 6-8Distance: 1.9 mi
- 5/10Casco Bay High SchoolGrades: 9-12Distance: 1.1 mi
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Sell for more on Zillow
Get a free Zillow Showcase℠ listing and you could sell for .
$450,900
2% more+ $9,018
With Zillow Showcase(estimated)
$459,918