PHILADELPHIA - A man police say set a fire that spread on a Center City street last month is being sought for arson.The fire ignited on the 300 block of North Broad Street on May 13, then spread to a commercial theater company nearby.The building suffered significant damage, according to authorities.MORE HEADLINES:Police say they are seeking a man, age 30-35, in connection with the fire.He was spotted on surveillance footage with a beard and multiple tattoos.