$6,800,000
Est. $37,665/mo6 bd•8.5 ba•9,340 sq ft
7909 78th Avenue SE, Mercer Island, WA 98040
• Listed Sep 11, 2026•30 days active · 30 cumulative
Listing Broker: COMPASS; Tere Foster; 425-637-8373; teamfoster@fosterrealty.com
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Listing Broker: COMPASS; Tere Foster; 425-637-8373; teamfoster@fosterrealty.com
About this home
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: October 9, 2026 at 04:15pm
RexMont checked: moments ago
Source: NWMLS as Distributed by MLS Grid #2580194
Around this home
How much should you offer?
7909 78th Avenue SE, Mercer Island, WA 98040
Source:RexMont analysis of Northwest MLS sales data for this ZIP code plus third-party market data (RentCast). The estimates are RexMont's, not Northwest MLS listing data.
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.
Property details
Interior features
- 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 System
- Vaulted Ceiling(s)
- Walk-In Closet(s)
- Water Heater
- Wet Bar
- Wine Cellar
- Wine/Beverage Refrigerator
- Wired for Generator
- 2 fireplaces (gas)
- Daylight, Finished basement
Kitchen
- Dishwasher
- Disposal
- Dryer
- Microwave
- Refrigerator
- Stove(s)/Range(s)
- Washer
Bedrooms
- 6 bedrooms total
- 1 on the main level
- 4 upstairs
- 1 on the lower level
Bathrooms
- 4 full bathrooms
- 4 three-quarter bathrooms (shower, no tub)
- 3 half bathrooms
- 8.5 bathrooms total (NWMLS count)
- 3 on the main level
Layout
- 2 Stories w/Bsmnt
- 9,340 sq ft finished
- 790 sq ft garage
Flooring
- Ceramic Tile
- Hardwood
- Travertine
- Carpet
Heating & cooling
- 90%+ High Efficiency heating
- Forced Air heating
- Heat Pump heating
- 90%+ High Efficiency cooling
- Central Air cooling
Schools
Ratings via SchoolDiggerMercer Island School District
- Lakeridge Elementary SchoolPublic · Grades K-5 · State rank 947 of 1,1382/10
- Islander Middle SchoolPublic · Grades 6-8 · State rank 9 of 51410/10
- Mercer Island High SchoolPublic · Grades 9-12 · State rank 2 of 39610/10
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.
Single-family home facts
As entered by the listing broker on Northwest MLS
Lot & site
- Topography
- Partial Slope,Terraces
- Vegetation
- Fruit Trees, Garden Space
- Lot number
- 3
- Zoning code
- R-15
- Zoning jurisdiction
- City
Systems
- Energy source
- Electric,Natural Gas
- Power production
- Electric, Natural Gas
- Water heater
- Gas
- Water heater location
- Basement
- Power company
- PSE
- Water company
- City of Mercer Island
- Sewer company
- City of Mercer Island
- Gas company
- PSE
- Irrigation water rights
- No
Rooms & extras
- Pool
- Indoor
- Spa
- Yes
- Bathtubs
- 4
- Showers
- 8
- Fireplaces on main
- 1
- Fireplaces upstairs
- 1
New construction
- Square footage source
- Public Records
- Lot size source
- Public Records
- Effective year built source
- Public Records
Manufactured home
- Land lease
- No
Neighborhood mobility
Doorstep, Pedal & Station Scores
Three RexMont scores for this exact address: what is on foot, what is by bike, and what rides past the door.
Ground Truth™
The ground, the slope, the flood zone and the noise at this address
Read from public hazard, flood, terrain and noise maps for this exact home.
Address Insider™
The members' report
Commute, transit, zoning and ADU potential, internet providers and the lifestyle around the home: the nearest grocery, coffee, park, services and transit stop. One free registration opens every home on rexmont.com.
Opens with the report above.
Sales & Tax Records for 7909 78th Avenue SE
NWMLS via MLS Grid · King County AssessorEvery listing, pending, price change and closing filed on this home with the NWMLS, the county’s recorded sales, and its assessed values by tax year.
- Sep 11, 2026ListedNWMLS via MLS Grid · #2580194$6,800,000$728/sq ft
- Aug 25, 2011SoldNWMLS via MLS Grid · #188606$2,330,000$249/sq ft
- Jun 17, 2011PendingNWMLS via MLS Grid · #188606$2,850,000$305/sq ft
- Mar 1, 2011ListedNWMLS via MLS Grid · #188606$2,850,000$305/sq ft
- Jan 31, 1994Recorded saleKing County recorder · Warranty deed$320,000$34/sq ft
Mortgage payment forecast
$42,483 per month
Great rateTakes about 5 minutes & won't affect your credit
Get pre-approvedSource: RexMont estimate, not Northwest MLS listing data. Interest rates from Freddie Mac's Primary Mortgage Market Survey via FRED (Federal Reserve Bank of St. Louis). Property tax and HOA dues from the NWMLS listing where provided, otherwise estimated; insurance estimated at 0.3% of price per year.
Estimate only. Actual payment depends on credit, lender, and program. PMI not included for down payments below 20%.
Ask about this home
A licensed RexMont broker will get back to you, usually in under 5 minutes during business hours.
Listing Broker: COMPASS; Tere Foster; 425-637-8373; teamfoster@fosterrealty.com
Market pulse
Mercer Island is a balanced market.
Supply and demand are roughly in balance. Neither side has a clear edge.
Offer insight: Homes typically sell with one offer near asking price.
List to sale price: The average home sells for about 2% below list price.
Time on market: The average home goes pending in around 60 days.
Recent sales nearby
Within 1 mile · last 6 months$2,650,000 Sold
5 days ago
4 bd•2.75 ba•~3,170 sq ft•Single Family
6543 81st Avenue SE, Mercer Island, WA 98040
2%
Under list
64
Days on market
0.9 mi
Distance
$2,125,000 Sold
1 week ago
3 bd•2.5 ba•~2,810 sq ft•Single Family
8510 SE 72nd Street, Mercer Island, WA 98040
3%
Under list
44
Days on market
0.6 mi
Distance
$2,918,000 Sold
3 weeks ago
5 bd•3 ba•~3,464 sq ft•Single Family
8636 SE 75th Place, Mercer Island, WA 98040
13%
Over list
15
Days on market
0.6 mi
Distance
$2,150,000 Sold
4 weeks ago
4 bd•2.25 ba•~2,510 sq ft•Single Family
8534 SE 79th Place, Mercer Island, WA 98040
2%
Under list
32
Days on market
0.5 mi
Distance
$3,350,000 Sold
5 weeks ago
5 bd•2.25 ba•~3,610 sq ft•Single Family
7580 SE 71st Street, Mercer Island, WA 98040
1%
Under list
34
Days on market
0.6 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 Oct 2026
MLS GRID Disclaimer
Based on information submitted to the MLS GRID as of October 9, 2026 at 04:15pm (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.
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