The most recent renderings of Amazon's skyscraper headquarters submitted to the city's design review board show the buildings with bold exterior colors, including a 500-foot tall green façade made of metal and glass.

Amazon hopes to commence construction next year on the first building of the group of three NBBJ-designed skyscrapers. It will reportedly be the largest urban campus of any tech company in the nation, according to the Seattle Times.

"The design board will discuss the project at its September 25 meeting, the fifth and perhaps final review session before the project moves into the permitting process," the Times reports.

Find previous CTBUH coverage of the project here.