[Jeff Chandler]

houses were built directly next to each other in every direction

Wow. Not much has changed in 9000 years.

[SunkenCiv]

:^) The houses used their roof smoke-holes for ingress and egress, making the roofs themselves the "streets" and the outer walls of the outermost homes the city wall. They were not only reliant on settled ag, they were big shots in the obsidian trade.