This is a legal question. I own 50% undivided interest in a house and surrounding land in California. I want to start a business, bringing people to hike, do photography, etc. They would pay a "day fee" of $50/person. I would do a little advertising to get clients. Can I legally do this without involving the other undivided owner? Do I legally have to do some sort of profit sharing or paperwork with the other owner?