§ 212-20.   Blocks.
   A.   Length. In general, all in a shall have a minimum length of 500 feet and a maximum length of 1,200 feet, unless special conditions warrant a variance.
   B.   Width. Whenever practicable, shall be of such width as to provide two tiers of of the minimum size permitted under the applicable zoning classification, except in the case of along a major thoroughfare where the fronts on an interior .
   C.   Through . Double-   are to be avoided and generally will not be permitted except where reversed is desired away from a major thoroughfare to a of lesser traffic volume.
   D.    . for commercial and industrial areas may vary from the elements of design contained in this section if the nature of the requires other treatment. In such cases, off-street parking for employees and customers will be required along with safe and convenient access to the system. Space for off-street loading will also be required with similar access. Extension of , railroad access and utilities shall be provided. The amount of shall be as required by Chapter 255, Zoning.