$6,800,000
Est. $36,010/mo6 bd•8.5 ba•9,340 sq ft
7909 78th Avenue Se, Mercer Island, WA 98040
• Listed 2026-09-11•3 days on market
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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.
Listed by Tere Foster • COMPASS
Listing updated: September 17, 2026 at 06:03pm
RexMont checked: moments ago
Source: NWMLS as Distributed by MLS Grid #2580194
7909 78th Avenue Se, Mercer Island, WA 98040
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.
Neighborhood mobility
Mercer Island School District
Assigned schools for this property per the listing's MLS data. School district boundaries change — verify the exact assigned schools with the district before purchasing.
$40,828 per month
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Mercer Island 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 for about 1% below list price.
Time on market: The average home goes pending in around 4 days.
$2,450,000 Sold
3 months ago
4 bd•2.25 ba•~3,020 sq ft•Single Family
8440 W Mercer Way, Mercer Island, WA 98040
2%
Under list
—
Days on market
0.4 mi
Distance
$2,825,000 Sold
3 months ago
4 bd•2.75 ba•~4,100 sq ft•Single Family
6749 82nd Avenue Se, Mercer Island, WA 98040
4%
Under list
—
Days on market
0.8 mi
Distance
$7,401,101 Sold
4 months ago
6 bd•7 ba•~6,092 sq ft•Single Family
7439 W Mercer Way, Mercer Island, WA 98040
6%
Under list
—
Days on market
0.4 mi
Distance
$2,700,000 Sold
4 months ago
4 bd•2.5 ba•~3,920 sq ft•Single Family
7830 80th Place Se, Mercer Island, WA 98040
4%
Under list
—
Days on market
0.2 mi
Distance
$3,024,000 Sold
4 months ago
5 bd•3.5 ba•~3,850 sq ft•Single Family
8421 Se 72nd Place, Mercer Island, WA 98040
5%
Over list
—
Days on market
0.7 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 Sep 2026
MLS GRID Disclaimer
Based on information submitted to the MLS GRID as of September 17, 2026 at 06:03pm (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.
© 2026 Northwest Multiple Listing Service. All rights reserved.
Equal Housing Opportunity. RexMont Real Estate is pledged to the letter and spirit of U.S. policy for the achievement of equal housing opportunity throughout the Nation. We encourage and support an affirmative advertising and marketing program in which there are no barriers to obtaining housing because of race, color, religion, sex, handicap, familial status, or national origin.
Open houses
2 dates$6,664,000
-$136,000 under list price
Nearby comparable homes
RexMont uses 3 strongest recent nearby sales, priced between $4.55M and $8M.
Rental earnings
$20,000/mo
Screening estimate from the comp-supported value. Verify with rent comps before underwriting.
$4,550,000Last sold price
7922 E Mercer Way, Mercer Island, WA 98040
$5,100,000Last sold price
6434 E Mercer Way, Mercer Island, WA 98040
Estimate is a comp-supported screen, not an appraisal or broker price opinion. Ask RexMont for a property-specific pricing review before writing or accepting an offer.
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