Police were spat on while dispersing a party involving more than 150 people in short-term rental accommodation at Arncliffe.
The incident is one of many "large, loud, or out-of-control events" at this type of accommodation across Sydney in recent months, police say.
A police statement said, about 12.45am on Saturday October 30, officers from St George Police Area Command were called to reports of a large party appearing to get out of hand at a home on Somerville Street, Arncliffe.
"Police were met with a hostile crowd, which included a 20-year-old man spitting at police," the statement said.
"More than 150 people were dispersed from the three-bedroom home with the assistance of the Central Metropolitan Region Operations Support Group and the Dog Unit.
"The inside of the property sustained damage and was left in disarray."
Police said owners of short-term rental accommodation were encouraged to do their due diligence when accepting bookings.
"While many online short-term rental or homestay booking websites have banned the use of properties for parties, police across the state have been called to numerous large, loud, or out-of-control events hosted at these types of rentals in recent months," the statement said.
"With the festive and end-of-year party season in full swing, police are reminding property owners to take extra measures to ensure their rental isn't misused.
NSW Police Corporate Sponsor for Alcohol-related Crime, Assistant Commissioner Peter Thurtell, appealed to owners and managers of short-term accommodation to assist in preventing unauthorised parties.
"Police are concerned about the increasing number of public disorder incidents, where homes are being seriously damaged, and the safety of attendees and the broader community is being threatened," he said.
"Anyone who would be disrespectful enough to trash another person's property would obviously not care about a corporation-imposed party ban, so the onus for protecting the property lies mostly with the owner.
"If you are renting out your property, we encourage you to build strong relationships with neighbours who can keep you notified of concerning activity.
"We also suggest you make sure your house rules are clear and guests know what is off-limits and consider extra insurance for any unforeseen circumstances."
Mr Thurtell said, where criminal offences were detected, police would not hesitate to take action.
"Violent behaviour will not be tolerated, and we remind people to act sensibly and respectfully. If you are breaking the law, you will be arrested," he said.
""If you are concerned about a gathering in your neighbourhood or building, please contact your local police. Of course, in an emergency, call Triple Zero.
"Finally, if you are hosting a party at your own property or a public venue, register the details with local police and make sure you have sufficient security measures in place to ensure your event is not targeted by gate crashers."
Information about planning a safe party, including registering the event with local police, is available on the NSW Police Force website: https://www.police.nsw.gov.au/online_services/party_safety/safe_party_tips.
