St. Petersburg Fire & Rescue crews continued securing the building Sunday afternoon after a structure fire at Prime Market Media Corp., 2260 Fifth Ave. S, St. Petersburg. It started in the back of the building, traveling under the floor toward Fifth Avenue. One firefighter was hospitalized and treated for dehydration. Prime Market Media is a video duplicating business and has been in the building for seven years. "It was actually a good day for us," said company co-owner Richard Lewis, left, knowing that he could have lost the entire business. He said firefighters told him the interior was not damaged and the blaze may have been started by a homeless person trying to create a fire.