AEP MEMCO, a dry cargo barge operator will be growing its business in a new Class A office building emerging at Chesterfield Village in Chesterfield, Mo. AEP MEMCO LLC will more that double the size of its headquarters by taking two floors in the five-story, 100,600-sq. ft. Central Park Square Office I being developed by Sachs Properties. AEP MEMCO, based at Chesterfield Village since 1995, will occupy 42,000 square feet when the new building opens next year. The start of Central Park I marks the 40th anniversary of Chesterfield Village and opens the next chapter – Downtown Chesterfield – in the 1,500-acre development. Downtown Chesterfield will include a second six-story, 150,000-square-foot office structure and four pedestrian-oriented retail buildings totaling 26,000 square feet.