5th & Columbia – F5 Tower

Back to Projects

5th & Columbia – F5 Tower

731,000 sf | Seattle, Washington | Highrise, Hospitality & Office | Design-Build Engineering

Hermanson recently completed Design-Build HVAC construction of the 44-story F5 Tower in downtown Seattle, previously known as “The Mark” or “5th & Columbia.” The building includes seven levels of below grade parking, four floors of conference center, and ten luxury hotel floors, including a restaurant, 25 levels of office space, and two floors of penthouse mechanical space. The mechanical system is comprised of multiple water cooled chillers, cooling towers, and pumps in the mechanical penthouse space that serve floor-by-floor chilled water air handlers (VAV) with airside economizer at the office floors and horizontal chilled water fan coils for the hotel floors. Additionally, a condenser water riser serves the building’s 24x7 loads and the lower level conference center heat pumps. Hermanson also completed seismic renovations and shell & core system upgrades to the historic First United Methodist Church next door to provide a venue for banquets and conferences.

Completed in 2017