This, with and without window:
This, but double (Instead of 5x (Will end into 10x) do it 4x (8x) because the last part is where the brick connector is):
This, double too
And if you can, make the default doors so they have decals, for example for shops, or making them worn out.
And for the first and third one, do some sort of magic so we can put arch bricks on them
Also you could do some windows (The ones who open) and 2 manhole covers: Circle and Square shaped