Attempts to build Children's Island quickly became entangled with the stadium deal. On September 10, 1991, the Dixon administration agreed to let the Redskins organization build parking lots on Kingman and Heritage islands. By March 1992, this agreement had been scaled back, so that the Redskins were permitted to build on only a portion of Kingman Island, while additional parking would be built on Langston Golf Course (which would be redesigned to accommodate the lots). The parking deal helped clinch the stadium agreement: On December 7, 1992, Redskins owner Jack Kent Cooke agreed to build his team's new stadium in the District of Columbia. Seven days later, Interior Secretary Lujan agreed to transfer of Kingman Island to the District of Columbia for construction of the children's theme park. By now, National Children's Island, Inc., was advocating a $120 million park which would include science, nature, and geography pavilions; an entertainment building; a plaza that would host fairs, marketplace booths, and outdoor performances; a science center; and formal gardens—while still preserving much of the two islands as a nature preserve. Under terms of the agreement transferring the land to the city, no more than could be utilized for buildings, and no structure could be taller than .