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$6,880,000
4102 100th Avenue SE, Mercer Island, WA 98040
Mercer Island, WA, 98040
Active · 137 days on market
5Beds
5Baths
5,535Sq Ft
2002Year built
0.505Lot (acres)
Single Family ResidenceType

About this home

Undeniably the best waterfront value of the summer! Invest in not one home but two: a 5 bedrm main residence with an apartment/office suite plus a separate 1 bedrm guest house right at the water’s edge. This Northend Retreat showcases 90 ft of shoreline, a pancake flat lawn, a newer dock. Inside, craftsmanship reigns w/triple crown molding + rich millwork & board & batten details. An epic Great Room awaits, flowing effortlessly through a fully opening retractable window wall & triple sets of French doors to multiple deck spaces & a covered outdoor living area w/ TV, frplc and built in BBQ. At its heart sits an Epicurean kitchen—a true command center for serious cooking & unforgettable gatherings. Private upper wing hosts an apartment suite w/ kitchenette ideal for work or multigenerational living. Retreat to the main flr primary, a sanctuary in itself, w/ soaring ceilings, stunning views, his/hers closets & its own laundry. The lower level unfolds into a wonderland of space w/ 3 bdrms (1 an ensuite), exercise + big bonus/billiard rm. At the shoreline, discover a charming beach house w/ upper view loft that could be the perfect art studio or massive storage space for all of the outdoor toys. Control 4 smart home. 3 laundry rms. 5 bdrm/4.5 bth, 5,535 sf main house, 1 bdrm/1bth, 950 sf casita. With a 3-car garage, generous auto court & newer boat ready dock, you'll never want to leave. Welcome home to the ultimate in wtrfrnt living!

Interior features

Second Kitchen
Second Primary Bedroom
Bath Off Primary
Dbl Pane/Storm Window
Fireplace
Pantry
Security System
Vaulted Ceiling(s)
Walk-In Closet(s)
Wine Cellar

Exterior features

Stone
Wood

Appliances

Dishwasher
Disposal
Double Oven
Dryer
Microwave
Refrigerator
Stove(s)/Range(s)
Washer

Parking

Attached Garage
RV Parking

Schools

Elementary: Northwood Elem
Middle: Islander Mid
High: Mercer Isl High
District: Mercer Island

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Courtesy of Windermere Real Estate/East. The data relating to real estate for sale on this site comes in part from the Northwest Multiple Listing Service (NWMLS). Listings held by brokerage firms other than this brokerage are marked by the three-tree symbol; detailed information about such listings includes the name of the listing brokerage. This information is provided for consumers’ personal, non-commercial use and may not be used for any purpose other than to identify prospective properties. All information is deemed reliable but not guaranteed and should be independently verified.

Based on information from the Northwest Multiple Listing Service as of August 22, 2026.

ARAgencyOne RealtyAgencyOne Realty · Questions about this home?