The Florida-based company that designed Boeing South Carolina's 1.2-million-square-foot final assembly plant in North Charleston will also design the aerospace giant's 1 million square feet of facilities for the new 777X twin-engine passenger jet in Everett, Wash.

BRPH, an international architecture, engineering design and construction services firm with a regional office in Charleston, has been selected by the Chicago-based aircraft manufacturer to design the facilities over the next five years, according to BRPH spokeswoman Kimberly Eye.

The program will be managed out of BRPH's Renton, Wash., office with minimal support from the Charleston office.

Initial plans will focus on the design of a composite-wing fabrication facility and related supporting infrastructure.

Boeing decided to build the 777X in Everett after the International Association of Machinists and Aerospace Workers in the Pacific Northwest voted in January for huge contract concessions, including the elimination of a long-fought-for pension program that will be replaced by a 401(k)-style savings plan. The move followed a threat by Boeing to move 777X production elsewhere unless the union agreed to concessions. That led to a nationwide competition that Boeing scuttled after the union vote.

Reach Warren L. Wise at 937-5524 or twitter.com/warrenlancewise.