All buildings or structures erected hereafter, all uses of land, buildings, or structures established hereafter, all structural alteration, relocation, or substantial improvement of existing buildings, or structures occurring hereafter shall be subject to all regulations of this chapter which are applicable to the zoning districts in which such building, structure, use, or land shall be located; except in a Residence District and the Agriculture District, a single-family detached dwelling may be erected on a lot of record existing on or before February 11, 1974, even though such lot does not conform with width and area requirements for the district in which it is located, and provided that there is compliance with all other regulations contained in this chapter and other applicable McLean County ordinances, regulations and codes.