Property Details
7909 78th Avenue SE, Mercer Island, WA 98040
Mercer Island, WA 98040
$7,580,000
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About This Home
Perched above Lake Washington with expansive views, this custom estate showcases exquisite cherry millwork throughout. The main-level primary suite opens to a private patio, and upstairs, an additional primary suite with its own terrace complements three more ensuites. Entertain effortlessly in the gourmet kitchen with high-end appliances and butler’s pantry. The lower level transforms into a resort-style retreat with indoor pool, spa, sauna, gym, theater, billiards room, and wine cellar. Outside, expansive decks, a sport court, putting green, and professionally landscaped grounds frame the serene lake backdrop. Experience refined luxury living in a singular setting.
Property Details
Property Information
Property Type
Residential
Subtype
Single Family Residence
Status
Active
County
King
Neighborhood
Mercer Island
Listed
Aug 18, 2025
Original Price
$8,488,000
Interior Features
Bedrooms
7
Bathrooms
11.0
Half Baths
3
Living Area
9,340 sq ft
Basement
Daylight, Finished
Entry Level
Main
Interior Features
Second Kitchen, Bath Off Primary, Built-In Vacuum, Dbl Pane/Storm Window, Dining Room, Fireplace, Fireplace (Primary Bedroom), French Doors, High Tech Cabling, Hot Tub/Spa, Indoor Pool, Jetted Tub, Pantry, Sauna, Security System, Sprinkler System, Vaulted Ceiling(s), Walk-In Closet(s), Water Heater, Wet Bar, Wine Cellar
Exterior & Lot
Lot Size
0.54 sqft
Year Built
1996
Exterior Materials
Stone, Stucco
Parking
Attached Garage
Sewer
Sewer Connected
Water Source
Public
Lot Features
Dead End Street, Paved
Exterior Features
Stone, Stucco
Location
City
Mercer Island
County
King
Coordinates
47.53149, -122.23534
Schools
School District
Mercer Island
Elementary School
Lakeridge Elem
Middle School
Islander Mid
High School
Mercer Isl High
Additional Information
Tax Year
2025
Annual Taxes
$32,248
Possession
Array
Inclusions
Dishwasher(s),Dryer(s),Garbage Disposal,Microwave(s),Refrigerator(s),Stove(s)/Range(s),Washer(s)
Mortgage Calculator
Estimated Monthly Payment
$0
Provided by Beyond Real Estate, LLC
Down Payment Assistance Available
This property may qualify for homebuyer assistance programs
Find out if you’re eligible for down payment assistance programs that could help make this home more affordable. Programs can provide thousands of dollars toward your down payment and closing costs.
Check Your EligibilityBased on information submitted to the MLS GRID as of April 2, 2026 5:49 AM. 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.
IDX information is provided exclusively for consumers’ personal, non-commercial use, and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Copyright 2026 NWMLS. All rights reserved.
IDX information is provided exclusively for consumers’ personal, non-commercial use, and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Copyright 2026 NWMLS. All rights reserved.
