7909 78th Avenue SE Mercer Island, WA $ 6,800,000
7909 78th Avenue SE
$ 6,800,000
Recently Listed
Open House 9/19 11am - 2pm
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7909 78th Avenue SE

Mercer Island, WA, 98040
$ 6,800,000
Bedrooms6 Baths8.3 Sq 9,340

Monthly Estimate*

$ 42,936

Listed by COMPASS
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Single Family Home for sale in Mercer Island, WA

for $6,800,000 with 6 bedrooms and 8 full baths, 3 half baths. This 9,340 square foot home was built in 1996 on a lot size of 0.5411.

Exceptional South Mercer Island living with Lake Washington and Mount Rainier views. Set on an expansive 23,000+ square foot lot, this impressive 9,340-square-foot residence offers remarkable scale, privacy and resort-style amenities designed for both everyday living and unforgettable entertaining. Generous gathering spaces flow throughout the home, while walls of windows capture beautiful views. Enjoy year-round recreation with an indoor swimming pool and private sport court—creating your own retreat without leaving home. Multiple indoor and outdoor entertaining areas provide space to host on any scale, from relaxed gatherings to special celebrations. A separate guest apartment above the garage offers exceptional flexibility for guests, au pair, home office or additional living space. Ideally located on the south end of Mercer Island with convenient access to shopping, dining, parks and highly regarded Mercer Island schools. A rare combination of views, space, recreation and convenience in one extraordinary island property.

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Open House

9/19/2026 11:00 AM - 2:00 PM
7909 78th Avenue SE Mercer Island, WA
* Some states or local ordinances may prohibit Open Houses at this time, please confirm with your Weichert agent or local rep to confirm

Single Family Active

Price

$ 6,800,000

Bedrooms

6

Full Bath

8

Half Bath

3

Property Type

Single Family

Taxes

$ 37,420

Style

2 Stories w/Bsmnt

Lot Size

0.5411

Year Built

1996

Town/City

Mercer Island

County/Region

King

MLS | Web ID

2580194

Features
General
Living Area 9340
Sewer Sewer Connected
Heating 90%+ High Efficiency Forced Air Heat Pump
Cooling 90%+ High Efficiency Central Air
Possession Closing Negotiable
Roof Tile
Appliances Dishwasher Disposal Dryer Microwave Refrigerator Stove(s)/Range(s) Washer
HOA Fee 0
Pool Features Indoor
Security Features Partially Fenced Security System
Year Built 1996
View Lake Mountains Territorial
Topography Partial Slope Terraces
Levels Two
Property Subtype Single Family Residence
Tax Year 2026
County King
New Construction N
Property Type Residential
HOA N
Attached Garage Y
Subdivision Name Mercer Island
Garage Y/N Y
Full Baths 4
Special Listing Conditions None
Status Active
Directions Please call with any questions.
High School Mercer Isl High
City Mercer Island
Entry Location Main
Senior Community Y/N N
High School District Mercer Island
MLS Area 510 - Mercer Island
Lot Size Units Square Feet
Lot Size Square Feet 23571
Carport Y/N N
Listing Terms Cash Conventional
Elementary School Lakeridge Elem
Land Lease Y/N N
Tax Annual Amount 37420.23
Middle/Junior High School Islander Mid
Public Remarks Exceptional South Mercer Island living with Lake Washington and Mount Rainier views. Set on an expansive 23 000+ square foot lot this impressive 9 340-square-foot residence offers remarkable scale pr
Structure Type House
Building Area Units Square Feet
Standard Status Active
Water Company City of Mercer Island
Property Style 18 - 2 Stories w/Bsmnt
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Interior
Interior Amenities Second Kitchen Bath Off Primary Built-In Vacuum Dbl Pane/Storm Window Fireplace Fireplace (Primary Bedroom) High Tech Cabling Hot Tub/Spa Indoor Pool Jetted Tub Pantry Sauna Security System Sprinkler
Basement Daylight Finished
Flooring Ceramic Tile Hardwood Travertine Carpet
Total Fireplaces 2
Fireplace Features Gas
Air Conditioning Y/N Y
Heating Y/N Y
Fireplace Y/N Y
Half Baths 3
3/4 Baths 4
Total Bedrooms 6
Main Level Bedrooms 1
Total Baths 11
Water Heater Type Gas
Water Heater Location Basement
Fireplaces Upper 1
Fireplaces Main 1
Power Production Type Electric Natural Gas
Baths Three Quarter Garage 0
Baths Three Quarter Lower 1
Baths Three Quarter Main 0
Baths Three Quarter Upper 3
Bedrooms Lower 1
Bedrooms Upper 4
Baths Half Upper 0
Baths Half Main 2
Baths Half Lower 1
Baths Half Garage 0
Baths Full Upper 2
Baths Full Main 1
Baths Full Lower 1
Baths Full Garage 0
Bathrooms 8.5
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Exterior
Exterior Amenities Stone Stucco
Vegetation Fruit Trees Garden Space
Parking Features Attached Garage
Lot Features Dead End Street Paved
Water Source Public
Total Parking 4
Inclusions Dishwasher(s) Dryer(s) Garbage Disposal Microwave(s) Refrigerator(s) Stove(s)/Range(s) Washer(s)
Foundation Details Poured Concrete
Spa Y
Building Area Total 9340
Lot Size Acres 0.5411
Waterfront Y/N N
Covered Spaces 4
Irrigation Water Rights Y/N N
Site Features Athletic Court Cable TV Deck Fenced-Partially Gas Available High Speed Internet Hot Tub/Spa Patio Sprinkler System
Pool Type Indoor
Lot Number 3
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Internal Only
OriginalMLSID NWM2580194
Street Number 1 7909
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* Excluded Features
List By
Tere Foster

Listing Agent

Compass

Broker

teamfoster@fosterrealty.com

Email

Affordability Calculator

$46,054
Per Month
93%
7%
0%
Monthly Principal & Interest
$42,936
Monthly Property Taxes
$3,118
Monthly Home Insurance
--
Default based on a 30-year fixed rate of 6.49% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.
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Nearby
257830 Elementary School
1853914 Middle School
Mercer Isl High High School
Pricing History
DatePricePrice ChangeDescription
9/11/2026$6,800,000 Listed Price

Map


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7909 78th Avenue SE, Mercer Island, WA, 98040 is a Single Family Home for sale at $6,800,000 with 9,340 sqft and a lot size of 0.5411. 7909 78th Avenue SE has 6 bedrooms, 8.3 baths, and was built in 1996. The property's zip code is 98040 which is in Mercer Island, WA