The incident was reported near Uptown Park Boulevard and the West Loop.
Because there were propane tanks in the empty space, contractors ran to Flower Child restaurant and another restaurant to evacuate people.
“I ran in there yelling, ‘Everybody get out, everybody get out.’ There’s going to be an explosion. We (were) waiting for the fire department and then heard, boom, boom, boom. Just like that,” said contractor Luke Marsh.