TechTown plans to seek close to $500 million in public and private support to completely redevelop its 12-block area in Detroit by 2020. Tech Town is collaborating on the project with the University of Michigan School of Architecture and Urban Planning, 75 architecture students from Cass Technical High School and the University City Science Center in Philadelphia, the oldest research and technology park in the country, said Howard Bell, executive director of TechTown. Final plans for the project are expected to be released in October.