Guests staying at three city hotels found their car windows smashed overnight.
Witnesses at the Drury Inn at Interstate 44 and Hampton say at least eight cars were broken into.
Cars parked in lots at the Millennium and Hyatt hotels in downtown St. Louis were also targeted.
The St. Louis Post-Dispatch reports that the project had been scheduled to begin this fall, but was pushed up to spring instead. Hotel officials aren't saying why they changed the dates of the planned redo.
The St. Louis Convention and Visitors Commission told the paper they'll work with the hotel to relocate some meetings that had been scheduled for the Millennium.