A true one-of-a-kind legacy property, this ultra-custom Timber Frame estate at the base of Mt. Si offers an unparalleled PNW lifestyle with low-bank Middle Fork River frontage perfect for kayaking, fly fishing, and summer tubing. Masterfully built with authentic mortise-and-tenon joinery, the 3,120 SF main home features a 4" old-growth cedar/metal door and polished concrete floors with in-floor hydronic radiant heat. Living spaces blend effortlessly with nature via an 8'x16' collapsing slider in the great room and an 8'x14' glass garage door in the chef's kitchen boasting a 60” Wolf range, Thermador fridge, and gorgeous quartz counters. Seamless entertaining flows from the dedicated theater room to a heated covered patio with Infratech heaters, a gas fireplace, and a built-in Weber grill. Unwind in the primary sanctuary featuring a private deck with unobstructed river views and a marble spa bath. Steps away, the massive 1,675 SF detached 3-car garage offers a lower workshop with built-in air lines, a half bath, second laundry set, plus a completely independent, fully appointed 800 SF luxury living space upstairs. Encompassed by irrigated grounds with automated lighting, an Artesian spa, and a 5' rock crusher fire pit at the water's edge, this irreplaceable masterpiece delivers ultimate alpine charm near world-class hiking and mountain biking, all just minutes from town with an easy commute to Bellevue and Seattle.