Can a 18 yr old high school senior move from the family home without permission

You can do it, but PLEASE DON'T! Maybe you might want to think about college or the armed forces instead.

Can my roommate evict me with no notice?

Yes. She should give you proper notice and if you fail to move, she would have to file in eviction court to have you forcibly removed.

Can a joint owner of a property develop the property without consent of the other owner?

Contact a real estate litigator. This is a very fact-specific situation and those facts will need to be assessed.

Do we have to go to mediation or can we file in small claims?

It would make sense to go to small claims court first. The judge may resolve it then and there, or the judge could order you to go tomediation. I...

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In California, can a joint tenancy be comprised of more than two people? Or is two the maximum number of people two?

More than two can be in joint tenancy, all owners must have the 4 unities: time, title, interest, and possession.

When you have a roommate and he moves out - shouldn't the landlord reduce the rent by 10% of the monthly rent?

Unless it is in the lease, no.

Rental House, Plumber came in about a leak said that all the plumbing in the home needs to be redone but homeowner will not pay

You need to provide written demand to cure the problems to you landlord. I would send by both certified and regular mail. If your landlord...

Do I have to stay if apartment is going to be closed? they have given us till Sept. 30.

I agree with my colleagues.

My townhouse suffered a fire and my unit has water and smoke damage. How can I be sure my unit is rebuilt properly?

I agree with my colleague. You can also hire a consultant to inspect as you advocate.

Does an executor have the right to use liquid assets to purchase real estate assets without consent of the other heirs?

You should contact a local probate lawyer to review the specific facts. You may need to intervene.