Consumer Protection Law
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The noise ordinance in San Francisco runs from 10pm until 7am and prohibits unreasonable noise levels between those times. So your simplest recourse is to just call the police immediately once it gets past 10 o'clock and they are being noisy. The police have a duty to respond and after a few times will start handing out citations and fines for violations of the noise ordinance. The neighbors will quickly learn that it gets very expensive to have loud parties when they are paying fines and court costs a few times.
I had a property where I lived in a college town and went through the same thing every semester. After a few times of calling the police on them, they got the message that they couldn't be loud there or the police would show up every time and they eventually took the party elsewhere..