Is it okay for my roommate to throw a party at my apartment without my okay?

We have seperate leases with the front office and it's by the bedroom. The apartment is 50% his and 50% mine. His parties usually have underage drinking and like 30 people in this tiny apartment, some of which are high (but they don't use the drugs here). Do I have the authority to stop the party?

Rather than get all caught up in your ego, why not just sit down with your roommate, have an adult conversation, and mutually agree to some groundrules?

nope

Yes, because if the cops show up at the door, you are going to get arrested too. I would also be complaining to the apartment manager.

M

Of course, and if he doesn't like it, I'd let the landlord know why you'll be looking for a different roommate.

The police ain't gonna give a crap about you having "seperate bedroom leases"...if you're in the same house/apartment when a raid happens, you will be one of the first ones hauled off in handcuffs. YES, stop the partying there if you want to continue to be a free man.

the answer to your question is no,you don't have the authority to stop the party, but it should have been agreed between the two of you before the party started. so you could have made arrangements to be somewhere else and not be involved with the party animals.

No, as long as he and his guests are in his half of the space. Now if they go into your bedroom, then they are doing something illegal.
I would speak to the front office and explain your problem. I am certain they are against underage drinking and loud parties where drugs may be involved. Good luck!
If that doesn't work, call the police yourself and make a noise complaint, even if you leave it anonymous, after several times of being called out, your complex should be moved to do something.

next time call your local police and let them sort it out dont try to tell him anything you possibly could get hurt