District Office

The District Office is a 90,400sf, 6-story building with a single level of below grade parking constructed of mass timber and concrete located in the central eastside of Portland, Oregon. The primary feature of the project is its exposed mass timber structure consisting of cross-laminated timber (CLT) floor panels with long-span glued laminated timber (glulam) beams supported on glulam columns at 10 feet on-center. Optimization of the structure was among early efforts to make the mass timber building a reality. Pricing studies were performed to determine optimum floor assembly; the final selected assembly consists of a 3-inch concrete topping slab over 3-ply CLT panels. One interesting design criterion considered was flexibility for future tenants. This was an early consideration since exposed timber construction cannot be modified as easily as a hidden structure while still maintaining the architectural intention.