$1,600,000
Est. $8,862/mo6,260 sq ft
13204 12th Avenue SW, Burien, WA 98146
• Listed Sep 18, 2026•30 days active · 30 cumulative
Listing Broker: Kidder Mathews; Max Frame; 360-705-2800; max.frame@kidder.com
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Listing Broker: Kidder Mathews; Max Frame; 360-705-2800; max.frame@kidder.com
About this home
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.
Listed by Max Frame • Kidder Mathews
Listing updated: September 18, 2026 at 04:17pm
RexMont checked: moments ago
Source: NWMLS as Distributed by MLS Grid #2584770
Around this home
How much should you offer?
13204 12th Avenue SW, Burien, WA 98146
Source:RexMont analysis of Northwest MLS sales data for this ZIP code plus third-party market data (RentCast). The estimates are RexMont's, not Northwest MLS listing data.
Estimates only and not guaranteed. Consult a RexMont agent for accurate, personalized guidance before making an offer. RexMont OfferEdge™ · © 2026 RexMont Real Estate. Proprietary tool.
Property details
Layout
- 5-9 Units
Flooring
- Vinyl Plank
- Carpet
Heating & cooling
- Forced Air heating
- None cooling
Schools
Ratings via SchoolDigger- Hazel Valley ElementaryPublic · Grades PK-5 · 0.4 mi · State rank 954 of 1,1382/10
- Cascade Middle SchoolPublic · Grades 6-8 · 1.2 mi · State rank 459 of 5142/10
- Highline Open Doors 1418Public · Grades 9-12 · 0.9 mi—
Schools shown are the nearest public Elementary, Middle, and High school for this property and may not be the assigned schools. Verify attendance boundaries with the district before purchasing.
Multi-family facts
As entered by the listing broker on Northwest MLS
Units
- Total units
- 4
- Units in building
- 8
- Units below grade
- false
- Building square feet
- 6,260 sq ft
Income & expenses
- Gross scheduled income
- $168,495
- Total monthly income
- $14,040
- Gross adjusted income
- $160,070
- Net operating income
- $107,950
- Cap rate
- 6.7%
- Gross rent multiplier
- 15
- Vacancy rate
- 5%
- Total expenses
- $52,120
- Insurance
- $2,012
- Electric
- $5,793
- Fuel
- $5,793
- Other expenses
- $15,344
- Water / sewer / garbage paid by
- 5793
Parking & storage
- Parking spaces
- 8
- Uncovered parking
- 8
Taxes & assessment
- Annual taxes
- $17,385
- Tax year
- 2026
- Financing
- Cash, Conventional
Neighborhood mobility
Doorstep, Pedal & Station Scores
Three RexMont scores for this exact address: what is on foot, what is by bike, and what rides past the door.
Ground Truth™
The ground, the slope, the flood zone and the noise at this address
Read from public hazard, flood, terrain and noise maps for this exact home.
Address Insider™
The members' report
Commute, transit, zoning and ADU potential, internet providers and the lifestyle around the home: the nearest grocery, coffee, park, services and transit stop. One free registration opens every home on rexmont.com.
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Sales & Tax Records for 13204 12th Avenue SW
NWMLS via MLS Grid · King County AssessorEvery listing, pending, price change and closing filed on this home with the NWMLS, the county’s recorded sales, and its assessed values by tax year.
- Sep 18, 2026ListedNWMLS via MLS Grid · #2584770$1,600,000$256/sq ft
Mortgage payment forecast
$10,711 per month
Great rateTakes about 5 minutes & won't affect your credit
Get pre-approvedSource: RexMont estimate, not Northwest MLS listing data. Interest rates from Freddie Mac's Primary Mortgage Market Survey via FRED (Federal Reserve Bank of St. Louis). Property tax and HOA dues from the NWMLS listing where provided, otherwise estimated; insurance estimated at 0.3% of price per year.
Estimate only. Actual payment depends on credit, lender, and program. PMI not included for down payments below 20%.
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Listing Broker: Kidder Mathews; Max Frame; 360-705-2800; max.frame@kidder.com
Market pulse
Burien is a seller's market.
Inventory is low and competition is high. Sellers have more negotiating power.
Offer insight: Well-priced homes draw multiple offers; others sell close to asking.
List to sale price: The average home sells very close to list price.
Time on market: The average home goes pending in around 58 days.
Recent sales nearby
Within 1 mile · last 6 months$650,000 Sold
3 days ago
4 bd•1 ba•~1,531 sq ft•Single Family
12286 Shorewood Drive SW, Seattle, WA 98146
6%
Under list
36
Days on market
0.8 mi
Distance
$620,000 Sold
3 weeks ago
4 bd•1.75 ba•~1,620 sq ft•Single Family
906 SW 130th Street, Burien, WA 98146
3%
Under list
47
Days on market
0.2 mi
Distance
$699,000 Sold
3 weeks ago
3 bd•1.75 ba•~1,366 sq ft•Single Family
1102 SW 124th Street, Burien, WA 98146
0%
Over list
32
Days on market
0.5 mi
Distance
$835,000 Sold
4 weeks ago
3 bd•1.75 ba•~2,470 sq ft•Single Family
11834 18th Avenue SW, Burien, WA 98146
2%
Under list
36
Days on market
0.9 mi
Distance
$499,950 Sold
4 weeks ago
2 bd•1 ba•~1,060 sq ft•Single Family
859 SW 132nd Street, Burien, WA 98146
0%
Over list
71
Days on market
0.1 mi
Distance
Closed sales from MLS GRID / NWMLS within the past 6 months, matched on property type and within 1 mile. Comps approximate.
Want a deeper read on this market?
Ask a RexMont agentMarket data from MLS GRID / NWMLS · Updated Oct 2026
Information and statistics derived from Northwest Multiple Listing Service. Source: Northwest Multiple Listing Service, as distributed by MLS GRID.
MLS GRID Disclaimer
Based on information submitted to the MLS GRID as of October 18, 2026 at 5:07 AM PT (date and time MLS GRID Data was obtained). All data is obtained from various sources and may not have been verified by broker or MLS GRID. Supplied Open House Information is subject to change without notice. All information should be independently reviewed and verified for accuracy. Properties may or may not be listed by the office/agent presenting the information.
Listing information courtesy of Northwest Multiple Listing Service (NWMLS). The listing data relating to real estate for sale on this web site comes in part from the Northwest Multiple Listing Service. Real estate listings held by brokerage firms other than RexMont Real Estate are marked with the “Listing courtesy of NWMLS” designation. Information provided is for the consumer’s personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.
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