Hey,
I've been working on a full sim setup of large unique store-fronts. Each sits on land between 512sqm to 1024sqm. There is no weekly rent, but our stores are setup for commission sharing so every sale you make here we would get a percentage to help cover our island tier, etc.
Each building is unique and has its own vendor setup inside. IM me InWorld to come take a look and see if it works for you.