The six-story base along the street front was needed to maintain the cornice of the surrounding six-story buildings was dictated by historic and design considerations. The decision to fill out the block to the maximum met economic goals. The housing, proposed as one corner tower cascading to the base, was instead split between two towers. The taller one, the Jackson Tower, falls just under Federal Aviation Administration limits at . The lower one, the Sibley Tower, is located back of the Mears Park facade.