Horizon House is a nonprofit senior living community in Seattle’s First Hill neighborhood. Consisting of two interconnected high-rise towers and one mid-rise building adjacent to the Lawrence Halprin-designed Freeway Park, the new West Tower will replace the mid-rise wing with 202 independent living units of senior housing in a 33-story tower over a 7-story podium with outdoor terraces, parking, amenity, and support spaces. At 438,000 square feet of Type 1A construction, the West Tower is clad with aluminum window wall, curtain wall, and metal panel systems on a concrete structure. The site is complicated by existing below-grade utilities and a 75-foot grade change from east to west. The project is targeted to achieve LEED Gold certification.
Responsibilities included building envelope detailing for curtain wall, composite metal panel, window wall, green roof, and other building envelope systems. This involved careful integration and coordination with structural, landscape, and interiors within an integrated design-build project delivery framework.
Completed while on workshare at Mithun via Environmental Works, 2025
Owner: Horizon House
Client: Anderson Construction
Project Manager: Ken Boyd
Project Architect: Amanda Bryan
Project Designer: Greg Catron
Renderings: Mithun
