Restoration work on the trading floor and surrounding building began in the early 1980s after decades of deterioration. Architectural features that were lost, with the exception of the trading pit, were rebuilt. The suspended ceiling was removed and new frescoes were added to replace it by Conrad Schmitt Studios of New Berlin, Wisconsin. The original canvas mural, located above the room's entrance and created by local artist John S. Conway, was the only piece of artwork that was completely intact in the 1980s. It only needed light cleaning.
In 2016, Joshua Jeffers bought the Mackie Building, and a large portion of the offices were converted to apartments and commercial spaces. The new Mackie building now has six floors and is half residential and half commercial property, with the Grain Exchange room available for special event rental. Renovation work has maintained the historical integrity of the original architecture.