False fronts. The tall wooden walls built onto 1 or 2 story stores that made them look big and impressive. They convey a small city scene -- looking somehow bigger and more important than a small town one with its single-story peaked-roof storefronts. There are a few kits with such fronts but there should be more. Seems like structures available for layouts are either small-town or big city styles, no in-between versions for anything else. And banks -- there should be a bank sized like the brick DPM buildings, with a granite stone front. If you have any kind or size of downtown in real life, there definitely is at least one bank in it. Even when the banks moved to bigger facilities, their distinctive building usually was repurposed.
(Yes, I've looked at almost every laser kit made and know there are a few false fronts, but we could use more. If you know of some in lesser-known or obscure laser kits makers list them)