4102 100th Avenue SE, Mercer Island, WA 98040

• 5 beds |
• 5 baths |
• 5,535 sqft

Property Description

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!

Listing Status:

Active

Data Last Updated:

August 27, 2026 at 12:21AM

Listing Office:

Windermere Real Estate/East : 425-643-5500

Listing Agent:

Joan C. Bayley : 425-643-5500

MLS ID:

2572498

Interior

• General: Second KitchenSecond Primary BedroomBath Off PrimaryDbl Pane/Storm WindowFireplacePantrySecurity SystemVaulted Ceiling(s)Walk-In Closet(s)Wine Cellar
• Appliances: DishwasherDisposalDouble OvenDryerMicrowaveRefrigeratorStove(s)/Range(s)Washer
• Basement: Finished
• Flooring: Ceramic TileHardwoodStoneCarpet
• A/C: Central Air
• Heating: Forced Air
• Fireplace: GasFireplaceFireplaces: 2

Exterior

• General: StoneWood
• Style: Craftsman
• Parking: Attached GarageRV ParkingParking spaces: 3

Construction

• Roofing: Flat
• General: 25 - 3 StoryPoured Concrete

Location

• HOA Amenities: 0.0
• Originating MLS: nwmls
• School District: Mercer Island
• County: King

Lot

• Topography: LevelPartial Slope
• Zoning: 4131900045
• View: LakeMountainsView
• Waterfront: 80

Utilities

• Water: Public
• Sewer: Sewer Connected

Financial

• Source: nwmls