It took more than a decade of planning, a messy court battle with preservationists and years of plodding construction, but the Obama Presidential Center will finally be unveiled on the South Side of Chicago on Thursday.

The opening itself will be a star-studded party, concert and celebration, the rare event that is expected to draw four former presidents — George W. Bush, Bill Clinton and Joseph R. Biden Jr., along with Barack Obama himself.

An invitation was not extended to Trump, who recently compared the center to a trash heap.