In the meantime, it would seem that the developer agreed to only charge the prevailing rate that the local government was charging at the time - 4 baht.
There do not seem to be any documents changing this. But who knows?
Secondly, all projects in Thailand have three stages to them.
I. Planning Application
II. Development (all at the Developer’s expense)
III. Management of Resort
You will see in Attachment 4, a schematic of this.