Guide on Restaurant City Exterior Base

Basically,
Starter, Tiny and Small Building Bases have almost the same height but different width.

In contrast,
Small, Medium, Huge and Behemoth Building Bases have the same width, whereas the difference come from the height.

The only Building Bases in which is really different from the others is the Large Building Base (difference shape).

Check this Picture to compare between Starter, Tiny, Small, Medium, Huge and Behemoth Building Bases.