DIED. Paul Ylvisaker, 70, educator and urban planner who chaired President Lyndon Johnson's Task Force on Cities in the mid-1960s; of a heart attack; in Washington. As a government official and as an educator at Harvard, Princeton and Yale, Ylvisaker advocated funneling federal funds to social programs that helped ameliorate poverty in cities. He served as New Jersey's first state commissioner of community affairs from 1967 through 1970, and helped plan and administer the construction of the revolutionary Meadowlands sports complex, which includes a stadium, an arena and a racetrack in the heart of a marshland.