Discover Castlemonte Apartments, an 8-unit investment opportunity located at 13204 12th Ave SW in Burien. Built in 1988, the property features 6,260 rentable square feet across two structures on a 13,350 SF lot zoned MU-1. The unit mix includes a studio, six spacious two-bedroom apartments, and a detached 2-bedroom single-family rental with a private yard. One unit is non-conforming. Property amenities include private balconies and patios, 14 off-street parking stalls, common laundry, and select units with territorial views. Recent improvements include a composition roof installed in 2021. Offered at a 6.75% in-place cap rate, Castlemonte presents an opportunity to increase NOI through rental upside and operational improvements. The two-structure configuration also offers potential to explore subdividing and selling the single-family home separately, subject to buyer verification and municipal approval. Conveniently located near Downtown Burien, Sea-Tac Airport, and major employment centers throughout the Puget Sound region.
Active
Listed by: Kidder Mathews • Max Frame
$1,600,000
13204 12th Avenue SW, Burien, WA 98146
6beds
5baths
6,260sqft
Multi Family
Built in 1988
-- sqft lot
$-- Zestimate®
$256/sqft
$-- HOA
What's special
Common laundryTwo structuresPrivate balconies and patios
- --
- on Zillow
- 43
- views
- 2
- saves
Zillow last checked:
Listing updated:
Listed by:
Max Frame,
Kidder Mathews
Source: NWMLS as distributed by MLS GRID,MLS#: 2584770
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 6
- Bathrooms: 5
Heating
- Forced Air, Electric
Cooling
- None
Features
- Flooring: Vinyl Plank, Carpet
- Has fireplace: No
Interior area
- Total structure area: 6,260
- Total interior livable area: 6,260 sqft
Video & virtual tour
Property
Parking
- Total spaces: 8
- Uncovered spaces: 8
Features
- Has view: Yes
- View description: Bay
- Has water view: Yes
- Water view: Bay
Lot
- Size: 0.31 Acres
Details
- Parcel number: 1823049146
- Special conditions: Standard
Construction
Type & style
- Home type: MultiFamily
- Architectural style: 5-9 Units
- Property subtype: Multi Family
Materials
- Wood Products
- Foundation: Poured Concrete
- Roof: Composition
Condition
- Good
- Year built: 1988
- Major remodel year: 1988
Utilities & green energy
- Electric: Company: Seattle City Light
- Sewer: Sewer Connected, Company: Southwest Suburban Sewer District
- Water: Company: King County Water
Community & HOA
Community
- Subdivision: Burien
Location
- Region: Seattle
Financial & listing details
- Price per square foot: $256/sqft
- Annual tax amount: $17,385
- Date on market: 9/18/2026
- Listing terms: Conventional
Estimated market value
Not available
Estimated sales range
Not available
Not available
Price history
| Date | Event | Price |
|---|---|---|
| 9/18/2026 | Listed for sale | $1,600,000$256/sqft |
Source: | ||
Public tax history
Tax history is unavailable.
Monthly payment
Est. payment






