The new U. S. Headquarters for Bayer Healthcare was constructed in two phases. The first linked two existing office structures with a five-story glass atrium. Each of the structures was renovated; one with a two-story vertical addition. In addition to these Class A office buildings, one of the existing research buildings was rejuvenated as a fitness center. As part of this phase, approximately 2,500 on-grade parking spaces was constructed within parking fields surrounding the buildings.