I have a few questions about this prerequisite:

b. How is a block length defined? Is the block length a total for all frontage length of a building or a test for each individual frontage?
c. How is the width of a sidewalk defined? From the face of the building to the back of curb?
d. Just want to confirm for this one that it's no more than 20% of the block length faced by garage opening and service bay only, not a parking garage, right?! We will have buildings with retail at the bottom, parking garage for a few floors and then offices above. So here, want to confirm that they are talking about the openings to the garage, but not the garage itself that will wrap around the block?
Thanks