Perched on a shy half-acre private lot, this architecturally significant mid-century modern home is a true masterpiece. Designed by renowned architect Peder H. Knudson, the home is a showcase of design and sophistication. It features striking floor-to-ceiling walls of windows that flood the interiors with natural light, along with multiple decks that seamlessly connect indoors and outdoor living. Its eclectic charm creates a calming, natural vibe. Surrounded by a Zen-like, park-like tranquility, this urban oasis has filtered water views from the main deck, where soaring eagles abound. The peaceful setting, on a dead-end street, secluded from neighbors, provides the perfect space to entertain or embrace a slower, more mindful lifestyle.
Sold
Listed by:
Lilian Bergsma-Lefever,
COMPASS
Bought with: Windermere Real Estate/East
$2,200,000
9505 SE 43rd Street, Mercer Island, WA 98040
4beds
2,850sqft
Single Family Residence
Built in 1969
0.45 Acres Lot
$2,178,500 Zestimate®
$772/sqft
$5,380 Estimated rent
Home value
$2,178,500
$2.00M - $2.35M
$5,380/mo
Zestimate® history
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What's special
Zillow last checked: 8 hours ago
Listing updated: June 12, 2025 at 04:02am
Listed by:
Lilian Bergsma-Lefever,
COMPASS
Bought with:
Christy B Shiers, 23018706
Windermere Real Estate/East
Source: NWMLS,MLS#: 2342751
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 4
- Bathrooms: 3
- Full bathrooms: 2
- 1/2 bathrooms: 1
- Main level bathrooms: 1
Primary bedroom
- Level: Lower
Bedroom
- Level: Lower
Bedroom
- Level: Lower
Bedroom
- Level: Lower
Bathroom full
- Level: Lower
Bathroom full
- Level: Lower
Other
- Level: Main
Den office
- Level: Main
Dining room
- Level: Main
Entry hall
- Level: Main
Other
- Level: Lower
Family room
- Level: Main
Kitchen with eating space
- Level: Main
Living room
- Level: Main
Utility room
- Level: Lower
Heating
- Fireplace, Forced Air, Heat Pump, Electric, Natural Gas, Wood
Cooling
- Central Air, Forced Air
Appliances
- Included: Dishwasher(s), Disposal, Dryer(s), Microwave(s), Refrigerator(s), Stove(s)/Range(s), Washer(s), Garbage Disposal, Water Heater: Gas, Water Heater Location: Lower Level Mechanical Room
Features
- Bath Off Primary, Dining Room
- Flooring: Hardwood, Slate, Carpet
- Windows: Double Pane/Storm Window
- Basement: Daylight,Finished
- Number of fireplaces: 1
- Fireplace features: Gas, Main Level: 1, Fireplace
Interior area
- Total structure area: 2,850
- Total interior livable area: 2,850 sqft
Property
Parking
- Total spaces: 2
- Parking features: Attached Garage
- Attached garage spaces: 2
Features
- Levels: One
- Stories: 1
- Entry location: Main
- Patio & porch: Bath Off Primary, Double Pane/Storm Window, Dining Room, Fireplace, Hot Tub/Spa, Water Heater
- Has spa: Yes
- Spa features: Indoor
- Has view: Yes
- View description: Territorial
Lot
- Size: 0.45 Acres
- Features: Cul-De-Sac, Dead End Street, Drought Resistant Landscape, Paved, Secluded, Cable TV, Deck, Gas Available, High Speed Internet, Hot Tub/Spa, Patio
- Topography: Sloped,Terraces
- Residential vegetation: Garden Space, Wooded
Details
- Parcel number: 0046100013
- Zoning description: Jurisdiction: City
- Special conditions: Standard
Construction
Type & style
- Home type: SingleFamily
- Architectural style: Modern
- Property subtype: Single Family Residence
Materials
- Wood Siding, Wood Products
- Foundation: Poured Concrete
- Roof: Torch Down
Condition
- Year built: 1969
- Major remodel year: 1969
Details
- Builder name: Peder H. Knudson
Utilities & green energy
- Electric: Company: Puget Sound Energy
- Sewer: Sewer Connected, Company: City of Mercer Island
- Water: Public, Company: City of Mercer Island
Community & neighborhood
Location
- Region: Mercer Island
- Subdivision: East Mercer
Other
Other facts
- Listing terms: Cash Out,Conventional
- Cumulative days on market: 3 days
Price history
| Date | Event | Price |
|---|---|---|
| 5/12/2025 | Sold | $2,200,000$772/sqft |
Source:  NWMLS #2342751 | ||
| 4/13/2025 | Pending sale | $2,200,000$772/sqft |
Source: NWMLS #2342751 | ||
| 4/11/2025 | Listed for sale | $2,200,000+63.6%$772/sqft |
Source: NWMLS #2342751 | ||
| 11/10/2015 | Sold | $1,345,000+17%$472/sqft |
Source: NWMLS #845081 | ||
| 9/19/2015 | Listed for sale | $1,150,000+15%$404/sqft |
Source: Ewing & Clark, Inc. #845081 | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2024 | $12,773 +1.2% | $1,949,000 +6.4% |
| 2023 | $12,616 | $1,831,000 -10.6% |
| 2022 | -- | $2,048,000 +37.3% |
Find assessor info on the county website
Neighborhood: 98040
Nearby schools
GreatSchools rating
- 9/10Island Park Elementary SchoolGrades: K-5Distance: 1.1 mi
- 8/10Islander Middle SchoolGrades: 6-8Distance: 2.3 mi
- 10/10Mercer Island High SchoolGrades: 9-12Distance: 0.4 mi
Schools provided by the listing agent
- Middle: Islander Mid
- High: Mercer Isl High
Source: NWMLS. This data may not be complete. We recommend contacting the local school district to confirm school assignments for this home.
Sell for more on Zillow
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$2,178,500
2% more+ $43,570
With Zillow Showcase(estimated)
$2,222,070