An additional dwelling on a lot may be permitted on lots used for single family residential purposes subject to the following conditions;
(a) A secondary dwelling unit may be permitted in the rear or side yard of a permitted dwelling if it conforms and is pursuant to conditional use procedures set forth in Section 1111.06.
(b) There must be provided for any such dwellings, an unoccupied and unobstructed accessway of not less than eight feet wide, to a public street for the rear dwelling unit.
(c) The secondary family dwelling unit shall be occupied only by members of the family occupying the primary dwelling on the lot.
(d) The secondary family dwelling unit shall not exceed seventy-five percent (75%) of the footprint square footage of the principal dwelling.
(e) Secondary dwelling shall be metered by a separate water meter.