St. Louis — Shell construction of the $54 million The Shoppes at Mid Rivers in St. Peters, Mo., is nearly complete, with concrete block and tilt-up walls in place despite weeks of rainy weather. Interior build-out is scheduled to begin in early June. Chesterfield, Mo.-based Knoebel Construction, Inc. is the general contractor on The Shoppes at Mid Rivers, the largest mall to be built in St. Charles County since 2008.