A once-buzzing steel mill off Saddle Creek in the heart of Omaha is one step closer to getting new life. But before researchers, investors and startup founders can occupy the space, construction crews need to build it. Sign up for our Newsletters UNMC announced the development team Tuesday that it chose to spearhead the project: Omaha-based GreenSlate and Denver-based Koelbel. It's a $45 million investment that takes advantage of the site's tax.