US former President Barack Obama has unveiled the vision for his presidential library in Chicago, a modern, 500 million dollars project he hopes will be a training ground for future leaders housed in the city that launched his career.<br/><br/>Speaking on the city's south side near the center's future site, the former President Obama revealed drawings and a 3-D rendering of a three-structure complex with a public plaza and surrounding park land near the shores of Lake Michigan.<br/><br/>The site is slated to be upwards of 225,000 square feet in size and house a library, museum and forum – as well as classrooms, meeting spaces, a community garden and a recreational area. Obama said a packed audience, the goal is to create an institution that will train the next generation of leadership.