Legal Question in Landlord & Tenant Law in California

Re: Can a lease prohibit parties?

You can contact the local code enforcement office if there are issues under the local zoning, housing or other laws. These might include over-crowding (though two people to a bedroom doesn't hit the mark), and violations of any noise ordinances that exist where you live (I've had clients who had code-enforcement on speed dial for noise problems after 10:00 pm). You can also call the police anytime the noise is excessive; in most cities that would be past 10:00 pm. Finally, you may be able to file a private action for nuisance and potentially other causes of action. There are no really great solutions, and you mention in your post that you are already doing my number one recommendation - working with the property owner. Unfortunately, he can only control their conduct to a degree, after which you will either have to pursue this in court, with the police or code enforcement. The property owner needs to have his tenants sign express Rules and Regulations, and be willing to enforce those rules through lawful means.

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Re: Can a lease prohibit parties?

Yes, but put some teeth into your negotiations. Explore a nuisance abatement suit. Contact me directly.