(A) Yards shall be measured perpendicular to the property line or from a future street or highway line as shown on the General Plan or established in the setback ordinance.
(B) Yard provisions shall apply to both main and accessory structures unless otherwise specified.
(C) No required yard or other open space around an existing building or any building hereafter erected shall be considered as providing a yard or other open space for any other building on an adjoining lot or building site.
(D) Garage doors shall not, when open or being opened, project beyond the lot line.
(`78 Code, § 17.64.020.)