 Working closely with developer Gerald T. Halpin, who had purchased more than 100 acres in Tysons in 1962, Hazel was able to get the land rezoned for mid- and high-rise commercial development.The first buildings in Tysons went up soon afterward, mainly catering to defense and national security contractors involved in providing services to the Central Intelligence Agency, which had relocated in 1961 to the Langley area of nearby Mclean, and to the Pentagon in nearby Arlington.Other businesses soon followed their lead.