Yes, if it is a lawful use/structure. Uses/Structures established in conformance with the rules in place at the time, but that are not consistent with the Land Use Code are considered lawful (aka legal nonconforming). A legal nonconforming use/structure may be continued and maintained in reasonable repair, but shall not be altered or expanded.
No, if it is an unlawful use/structure. Uses/Structures that were not consistent with the rules in place and are not consistent with the Land Use Code are considered unlawful (nonconforming). The Code does not allow for the perpetuation of unlawful development.