The tallest mass timber structure in the world upon completion, Ascent rises 25 stories in Milwaukee. The UK's largest Passivhaus school which features cross laminated timber as its main structural element and has brought many benefits to the school.The Keller Center is an adaptive reuse of 60-year-old structural concrete beams, columns, floors, exterior limestone facade, and existing windows. It's the size of a soccer field, so we knew we had to carve into it. Wisconsin city already home to world's tallest wooden building announces proposal for tower with 55 floors. The Keller Center, Harris's home, offers a world-class destination on Chicago's South Side.