4102 100th Avenue SE

Mercer Island, WA 98040

A Modern Craftsman has come available on the desirable north end! Offering 90 feet of sparkling waterfront, a boater's dream dock & an unforgettable beachside guest house, this exceptional property is set on a 1/2 acre of richly manicured grounds w/ a pancake flat lawn stretching right to the water's edge. Inside, experience timeless architectural detail...chubby triple crown molding, board-and-batten 3/4 wainscot, an absolute exquisite level of craftsmanship awaits. Entertain in the Epicurean's dream kitchen where a massive island anchors the rm, offering space for gathering, prepping & entertaining. Flow seamlessly into the Great Rm, where an entire window wall & double sets of French doors open, blurring the line between the outdoors & the in. A separate upper wing hosts an expansive office/apartment suite w/ kitchenette ideal for work, guests, or multigenerational living. Retreat to the main flr primary, a sanctuary in itself, w/ stunning views & bath area reminiscent of a Four Seasons spa. 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 1-bdrm beachhouse w/ upper view loft that could be the perfect music rm, office or art studio. 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!

Courtesy of NWMLS
Listing courtesy of Joan C. Bayley of Windermere Real Estate/East



Listing information is provided by Participants of the Northwest MLS. IDX information is provided exclusively for personal, non-commercial use, and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Information is deemed reliable but not guaranteed. Copyright 2026, Northwest MLS.
All data is obtained from various sources and may not have been verified by the 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.
Last checked: 2026-04-10 12:37 AM PDT