Lime ave. 2 story vacant apartment with smoke and fire visible upon units arrival. E-03,E-01,E-04, and A-01 and C-03. Crews advanced Two lines for inital attack and made quick knock-down. Crews on the scene with No injuries to by-standers or FD personnel. City PD requested due to undetermined origin. Some of these units were on earlier Working Fire. Not the best way to start off the week. Good job by the Brothers and Sister's of the WSFD.