(a) In a Class U4 District, where the side line of the lot adjoins a Class U1, U2 or U3 District, no building, unless located fifty feet or more back from the street line, shall be erected within ten feet of such adjoining Class U1, U2 or U3 District.
(b) In a Class U4 District, where the rear line of the lot adjoins a Class U1, U2 or U3 District, every building erected shall have a rear yard. The least dimension of such yard shall be at least twenty percent (20%) of the depth of the lot, but such least dimension need not be more than forty feet, provided such least dimension shall in no case be less than one-half of the height of the principal building thereon.
(c) Forty percent (40%) of the area of such rear yard may be occupied by a one-story accessory building, but on a corner lot no such accessory building, if detached from the main building, shall be erected within twenty feet of the street line and no such accessory building, unless located fifty feet or more back from the street line, shall be erected within ten feet of the rear lot line. (Ord. 121-1962. Passed 12-17-62.)