Somerville-based Arrowstreet has promoted David Bois, Amy Korte, Sean Selby and Larry Spang to principals at the architectural firm.

Bois possesses an extensive understanding of mixed-use development. He is regarded as a specialist with hospitality planning and design.

Korte has a diverse background in architecture, environmental design and interiors. As a principal, she will as an in-house design lead with an expertise in the housing sector.

Spang specializes in the public process, including its intersection with private development. In this new position, Spang will continue to lead the firm’s school work and advise clients on all aspects of complex permitting.

Selby’s experience ranges from mixed-use to housing to retail. Among his most recent work is the first LEED-certified retail building in Maine and the Northeast’s largest rock climbing gym. As an Arrowstreet principal, Selby will evolve the firm’s long-standing core strength in retail design.

Arrowstreet will relocate from its current Somerville location, moving to 10 Post Office Square in downtown Boston at the beginning of 2014.