Get ANY Wall Or Floor:
Firstly, go to Walls/Floors. Pick any Wall or Floor that need Cafe Cash to purchase, then put it in your cafe and select not now. Hit the check and select Save.
Utilising this simple trick allows you to serve the tables without having to walk to the table. Move the counters or plants so that the waiter can't walk out, and be certain that the drawer side is facing the waiter.