The minimum setback requirements apply only to the entire tract, and no buildings shall be located within such setback areas. The minimum distance between buildings in an apartment development shall be 25 feet, except that no wall containing an entrance to an apartment shall be closer to another apartment building than 50 feet. No apartment building shall be closer to a preexisting single-family or two-family dwelling than 50 feet. For each foot that the height of a building exceeds 35 feet, these dimensions will be increased by a foot. Every apartment building shall have a minimum setback of 20 feet from all interior roads, driveways and parking areas. A wall of an apartment structure or parallel walls of adjacent apartment structures shall not continue in the same plane for a length of more than 75 feet without an offset of at least four feet.