Every building hereafter erected, structurally altered, or relocated shall be placed on a lot as herein defined.

Except as specifically otherwise provided herein for attached single-family dwellings, apartments, or planned development projects, only one principal residence building shall be permitted on a lot; provided, however, that the Zoning Board of Appeals may grant an exception to permit more than one principal building on a lot where such grant would not be contrary to the spirit or intent of this chapter or to the regulations applicable to the specific district, and provided that a sufficient lot area is provided and the buildings so located as to individually meet the setback, offset, lot size, density and open space requirements of the district in which located.

No lot shall hereafter be created or any building placed on a lot which does not abut on a public street or approved way except as hereinafter provided.

Subject to the approval of the Plan Commission, a building may be permitted on a tract of land which does not abut on a public street or approved way, provided that such tract of land is at least 40,000 square feet in area, and provided further that such tract has access by permanent easement to a public street or approved way and does not conflict with plans for the future development of streets in the area, except that where a future street is possible the Plan Commission may require a sixty-foot street reservation.