I have started on the first shop building and I gather it will be enough with two stories + loft. It is an expandable design where you can basically divide it into sections lengthwise and height wise. Not saying that all need to keep to this design, but I think for a city center - the buildings should have similar height for the bulk of them.

There can be monument-like buildings which stand out, like a capitol building, cathedrals or towers.
The facade of the n00b hotel could be re-made or made taller (add floors). The interior is too well made for a remake of the entire building.

BTW: We need clay for bricks