Ok now this is akward.
My house, the shrine, + the first temple i built are in your suburban territory.
I guess the house and the shrine can fit into the whole thing, but can you tell me how deep you want to dig in the average house next to your city?
The temple lies about 20 Blocks below sea level, and parts of it reach in your city territory.
I am really sorry, i just didn't realize this is going to be your city.
The suburbs will probably have just have single basements in houses that probably will not go farther than 10 blocks underground. Also, wlollpop, I have another idea for house design here.