The Obama Foundation released plans last week for the presidential center it plans to build in Chicago’s Jackson Park, but behind the scenes, a battle is taking place to keep the former Democratic president from building on that specific lot of land, and there’s still a chance that it gets delayed when it seeks federal approval.

What initially started out as a library has morphed into a 20-acre private “center,” and some environmentalists and historians are unhappy with the Obama Foundation’s plans to swoop in and take over a national historic place.