Crews from Layton Construction Co. work atop the four-level parking terrace under construction at the Salt Lake International Airport. A tree, fastened to a temporary railing in the terrace roof, signals the topping off of the $32.9 million terrace structure. Still left to be completed are the terrace's ramps, access bridges to airport terminals, buildings for car rentals, elevators and escalators. The structure is scheduled for completion in November.