Crews are fighting a 4-alarm fire at an apartment building in downtown Stockton Tuesday morning. The scene is at the Mayfair Apartments along N. El Dorado Street. Stockton Fire crews responded a little before 7:30 a.m. and found heavy smoke and fire showing through the roof of the building. Firefighters battled flames on the third, fourth and attic space of the building. Residents safely evacuated from the building, firefighters say. One resident had to be carried down from the fourth floor. About 15 people were evacuated from the building, crews say.