Gov. Bruce Rauner wants to sell the Thompson Center, located in downtown Chicago, to a private developer via a public auction. 

Speaking at a Tuesday press conference about the plan, the governor said the state of Illinois building, which opened in 1985, is "ineffective and inefficient for taxpayers."

"For the people who work here, all of whom are eager to move somewhere else, it's noisy. It's hard to meet with your colleagues. It's hard to move through the building, very ineffective, noise from downstairs, smells from the food court all get into the offices," he said.

"From a pure financial point of view," the governor added, "this is a compelling opportunity for the people of Illinois."

Rauner said the city of Chicago could see some $20 million in new tax revenue if a private development comes to the property, located at 100 W. Randolph St. The building could be demolished and replaced once sold to a private developer.

The Thompson Center's architect, Helmut Jahn, said the state has allowed the building to fall into disrepair over the years. He said the building should be repurposed and upgraded.