Very good and fair for the most part, but there are a number of things i felt could have definitely have been more thought out.
For example, a Planar Travel dock, for some reason, is the least profitable out of all the docks. Furthermore, the Mill seems to be the most profitable expansion for some reason? Also, a number of structures which don't have an income rate feel like they should, such as the dining hall, theater, battle ring, garden, poisoner's grotto, stables, and animal pens.
While this was a very good basis for me to make my own set of homebrew rules, it didn't really cover everything I was hoping it would. In my opinion, change "room points" back to "expansion points" and then just give a simple modifier to the building itself if it's meant more as a business than a home.