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7909 78th Avenue SE Mercer Island, WA $ 7,800,000
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$ 7,800,000 Get more info
7909 78th Avenue SE
$ 7,800,000
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Share Save

7909 78th Avenue SE

Mercer Island, WA, 98040
$ 7,800,000
Bedrooms7 Baths8.3 Sq 9,340

Monthly Estimate*

$ 48,662

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

for $7,800,000 with 7 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.

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 two 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 waterfront living in a singular setting.

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Single Family Active

Price

$ 7,800,000

Bedrooms

7

Full Bath

8

Half Bath

3

Property Type

Single Family

Taxes

$ 32,247

Style

2 Stories w/Bsmnt

Lot Size

0.5411

Year Built

1996

Town/City

Mercer Island

County/Region

King

MLS | Web ID

2420036
Features
General
Living Area 9340
Sewer Sewer Connected
Heating 90%+ High Efficiency Forced Air Heat Pump
Cooling 90%+ High Efficiency Central A/C
Possession Closing
Roof Tile
Appliances Dishwasher(s) Disposal Dryer(s) Microwave(s) Refrigerator(s) Stove(s)/Range(s) Washer(s)
HOA Fee 0
Garage Spaces 4
Pool Features Indoor
Security Features Security System
Year Built 1996
View Lake Mountain(s) Territorial
Topography Partial Slope Terraces
Levels Two
Property Subtype Single Family Residence
Tax Year 2025
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 GPS is accurate
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 Out Conventional
Elementary School Lakeridge Elem
Land Lease Y/N N
Tax Annual Amount 32247.72
Middle/Junior High School Islander Mid
Public Remarks 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
Virtual Tour https://my.matterport.com/show/?m=eZ1B2uPkJQF&brand=0&mls=1&
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 Double Pane/Storm Window Dining Room Fireplace Fireplace (Primary Bedroom) French Doors High Tech Cabling Hot Tub/Spa Indoor Pool Jetted Tub Sauna Secu
Basement Daylight Finished
Flooring Ceramic Tile Hardwood 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 7
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 5
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 Gas Available Hot Tub/Spa
Pool Type Indoor
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Internal Only
OriginalMLSID NWM2420036
Street Number 1 7909
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* Excluded Features
List By
Helena Chen

Listing Agent

Exp Realty

Broker

Affordability Calculator

$51,349
Per Month
95%
5%
0%
Monthly Principal & Interest
$48,662
Monthly Property Taxes
$2,687
Monthly Home Insurance
--
Default based on a 30-year fixed rate of 6.375% 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
See complete school information
Pricing History
DatePricePrice ChangeDescription
11/26/2025$7,800,000 -2.26% Price Down
9/10/2025$7,980,000 -5.98% Price Down
8/19/2025$8,488,000 Listed Price

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7909 78th Avenue SE, Mercer Island, WA, 98040 is a Single Family Home for sale at $7,800,000 with 9,340 sqft and a lot size of 0.5411. 7909 78th Avenue SE has 7 bedrooms, 8.3 baths, and was built in 1996. The property's zip code is 98040 which is in Mercer Island, WA

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