No building, structure, land, or water shall hereafter be used or developed and no building, structure, or part thereof shall hereafter be located, erected, moved, reconstructed, extended, enlarged, converted, or structurally altered except in conformity with the regulations herein specified for the district in which it is located; except that in residence districts, a lot of record as of 12-1-1964, even though not meeting the requirements of this chapter as to area and width, may be used for single-family residence purposes.