Can my investor in a co-owned property give notice to the renters to vacate with out my permission?

I am tenents in common with a "friend" on a house. (50/50)(Calif) We are renting out this property. My "friend" has decided he wants to move into the house. Can he give the current renters a 30 day notice without my permission? I do not want him to move into the house, and would rather keep the renters. My name is on the month to month lease agreement with the renters, we own this house 50/50 together as Tenents in Common. I have given a counter to the evition notice that he has served the renters, and stated that he can not give notice without my written consent. Am I correct in this? Any advise on this subject would be greatly appreciated.

In the case of a 50/50 ownership, you can evict the current tenants without both of your approval. If you have thusly informed the tenants, then they have nothing to worry about.
I certainly hope you informed your co-investor of what you did. Think its probably time to find a new partner, or to sell out to him. You two are not going to last long.

Sounds correct to me...
Your name is on the rental agreement and you are a
legitimate owner...

You would have to look at your contract with your partner. Since you have equal interest in the property and if you're splitting the rent 50/50, and your contract is notorized, then he should, by all rights, be in agreement with you.

You can also call an attorney that does not charge consultation fees, or has minimal fees for this consult. It might pay to have him read the written agreement between both of you. If this transaction was on a handshake and there isn't any paperwork filed describing the co/ownership details, then it's going to be a private battle between the two of you.

If this is the case, then tell him if he's going to live on the premisis then all utilities, taxes, home upgrades or repairs will also belong to him. Create a regular lease agreement based on the terms you state, and also follow the regualtions of that particular city, county, state regulation. The public library will have books regarding the laws on the books for signed lease agreements.

Hope this helps a little. But in my own opinion, this person who is co/owner had a lot of $alls doing that without your permission. Just my opinion though.