William K. Nakamura U.S. Federal Courthouse

This GSA federal courthouse is located in downtown, Seattle, WA. Built in 1939, this courthouse is listed on the National Register of Historic Places. Hinman provided blast consulting services which included a risk assessment, perimeter security and large scale modernization. Hinman was responsible for providing blast mitigation analysis and design for the renovation and seismic upgrade for this $74-million, 178,000-s.f. courthouse.

KPFF provided civil and structural engineering services for the $80-million upgrade of this historically significant US Courthouse, designed to achieve LEED certification. Under the direction of the GSA and Federal Courts, work included the seismic rehabilitation and upgrade of the building, addition of a new underground parking structure, and a rehabilitation of the terra cotta cladding. The new underground garage features a secured entry portal for parking and a landscaped plaza on the lid of the garage.

In addition to strengthening measures a new blast resistant exterior façade and perimeter anti-ram barrier system were also provided.

KPFF’s project scope included civil engineering services which included erosion and sedimentation control, grading for site work and ADA accessibility, drainage, stormwater detention, and the foundation drainage system for the parking garage. Street improvements included a vehicle barrier system located in the public right-of-way for building security, signal and channelization modifications, and bus stop relocation.

Hinman's project scope included blast mitigating measures for primary and secondary entrance lobbies, new mailroom, loading dock and US Marshal spaces. Hinman performed site observation, documented existing conditions and designed strengthening measures of existing building elements in accordance with the ISC Security Design Criteria. In addition to strengthening measures a new blast resistant exterior façade and perimeter anti-ram barrier system were also provided. Hinman collaborated closely with the Architect and Structural Engineer to develop design solutions that were sensitive to the historic fabric while delivering a design within the project budget goals.