(A) Length. The maximum length of a block is1,500 feet and the minimum length is 400 feet. Blocks over 900 feet long may require pedestrian ways at least ten feet wide at their approximate center. The use of additional pedestrian ways to schools, parks and other destinations may be required.
(B) Arrangements. A block must be so designed as to provide two tiers of lots unless it adjoins a railroad, collector or arterial street system, or other types of barriers in the form of schools, parks, major developments, corporate limits or other major uses, where it may have a single tier of lots.
('72 Code, § 345:55)