CHICAGO (AP) — Officials in Chicago have chosen a real estate firm to run a $1 billion overhaul of Union Station. Chicago-based Riverside Investment & Development is calling redevelopment of the iconic building a “transformative” project for the city. The total development will run 3.1 million square feet. Amtrak says it’ll negotiate final terms of the development agreement by the end of this year. Riverside says the project will create thousands of jobs.