That is why you stick buildings with high production times in the inner ring and storehouses outside the buff zone. The outer buildings will be right by the storehouses and the inner ones will have a slightly longer walk, but an extra 10-20 seconds means nothing to a building with a 20-30 minute production time. Alternatively if you want all fast buildings, a storehouse placed at the corners of the market allows for what is essentially 4 honeycomb placements for fast delivery times for all.