That was hard to read, but it sounds like he commanded the power on takeoff and was unable to perform a power reduction. They turned the plane around and stowed one engine with the emergency shut down and landed OEI and taxiied to the terminal with one engine at WOT, and that it failed to stow on the ESD, the brakes failed to hold and he slammed into the building. My only real operational question is, "WTF did he taxi to the terminal for and place himself in a position where he could hit something?"