Under federal law, the National Capital Planning Commission, the United States Commission of Fine Arts, and the D.C. Historic Preservation Commission all have review and approval rights over construction in the metropolitan D.C. area. As the design went through these agencies for approval, it was slightly revised. The building was moved toward the southern boundary of its plot of land, to give a better view of the Washington Monument from Constitution Avenue. The size of the upper floors were shrunk by 17 percent. Although three upper floors were permitted (instead of just two), the ceiling height of each floor was lowered so that the overall height of the building was lowered. The large, box-like first floor was largely eliminated. Added to the entrance on Constitution Avenue were a pond, garden, and bridge, so that visitors would have to "cross over the water" like slaves did when they came to America.