What you do is you hire an attorney to research this and, if it is legal as you want it structured, set it up for you. What you ask is very involved, and implictes among other things, both federal and state securities laws you may need to register and conform to requiements about disclosures and reporting--it's also possible you don't, but with  up to 100k members investing, it's certainly possible that you do, FTC rules about advertising,  state laws about acting as a real estate broker, state and federal tax law, etc. Again, it could be that at the end of the day, this will be simple to do--but there are two many areas of law that could be involved, including ones that are very technical e.g. securities and tax law and which have very high penalties for violations, for you to not have this reviewed and structured professionally. If you feel you won't make enough money to justify the cost of an attorney, then you shouldn't do this it's too potentially risky to do if you have a very low expectation of return.