Infrastructure design and construction firm HNTB has signed a lease for three floors of new office space in downtown Bellevue as part of the company’s growth and expansion plans in the Puget Sound region.

Previously at 600 108th Ave. NE in Bellevue, HNTB is moving down the street to the Symetra Center building at 777 108th Ave. NE, suite 1000. The new space is located near the upcoming East Link light rail station in downtown Bellevue, providing current and future employees with public transportation commuting options.

HNTB first expanded into the Seattle area in 1960 and opened its Bellevue office 41 years ago. In the last 24 months, HNTB says the company has grown its workforce from 215 to 275 employees to meet the demands for transportation planning, engineering, program management and construction management services in the Puget Sound region.

HNTB has been involved in some of the region’s most high-profile infrastructure programs.

The firm’s signature infrastructure projects in the region include Sound Transit’s East Link Extension and Lynnwood Link Extension projects, the Alaskan Way Viaduct Replacement Program, Mercer Corridor improvements in Seattle, the third runway at Seattle-Tacoma International Airport, the second Tacoma Narrows Bridge, Washington State Department of Transportation General Engineering Consultant Services for I-405, SR 509/SR 167 Gateway Program and the Northwest Region General Engineering Consultant Services, the South Park Bascule Bridge Replacement in Seattle, the Mount Baker Ridge Tunnel, historic work on I-5 dating back to the 1960s, and the Tilikum Crossing Bridge in Portland, Oregon.

The firm has experienced substantial growth in the last 24 months largely due to the robust projects of its Puget Sound clients, which include the Washington State Department of Transportation, Sound Transit, the City of Bellevue, the Port of Seattle, and the Seattle Department of Transportation, among others.

The firm anticipates continued aggressive growth in future years.