Within the districts established by this article, or amendments hereto, there exist lots, structures, uses of land and structures, and characteristics of use which were lawful before this article was enacted, amended, or otherwise made applicable to such lots, structures, or uses, but which do not conform to the regulations of the district in which they are located. It is the intent of this division to permit such nonconforming uses to continue, under regulations herein contained, until the same are removed, but not to encourage their survival.