I would recommend going with a token and a platform that does not take too much time to process a transaction. Being that you are looking to implement the blockchain to real estate you should know that those buyers and sellers look to process paper work fast, which is why they still use fax machines. As to what can be saved on the blockchain, depending what you go with, anything. Literally! Look into library credits and what they are doing.
You can later even add an investment platform for people to invest through the blockchain and than later get rewarded. I can share better details about this through pm.