Utah-based Mountain America Credit Union has broken ground on a new and visually dramatic 11-story corporate headquarters next to Interstate 15 in Sandy. In a landmark addition to the already-booming corridor that includes the Silicon Slopes, the glass-clad building at 9800 S. Monroe St. just east of I-15 will be among the state’s tallest office towers outside Salt Lake City’s urban core. Sandy Mayor Tom Dolan called the 327,000-square-foot office block, slated to open in early summer 2018, “eve... <iframe src="http://www.sltrib.com/csp/mediapool/sites/sltrib/pages/garss.csp" height="1" width="1" > </frame>