The National Capital Planning Commission quickly approved of the transfer. However, various other groups were opposed to the theme park development, including several Advisory Neighborhood Commissions, the Anacostia Watershed Society, the Capitol Hill Restoration Society, and the Committee of 100 on the Federal City (a highly influential businesspersons' and civic leaders' organization). The D.C. City Council nonetheless approved the land transfer on July 13, 1993, although it also required that any plans for the islands be submitted to the council for approval. The Council also required the company to complete an environmental impact assessment and more than a dozen other studies and present them to the Council before any development could proceed. Meanwhile, the loss of parking space to the children's theme park and rising Congressional opposition to the stadium deal (primarily due to the impact it would have on local residents and its high costs) imperiled the D.C. stadium deal. Congressional opposition rose significantly after the stadium's chief proponent, D.C. City Council Chairman John A. Wilson, committed suicide on May 19, 1993. By December, Redskins owner Jack Kent Cooke had pledged to build his stadium in Maryland.