Foreclosed and vacant homes are becoming the spot of choice for some entrepreneurial partiers.

Police around the country are busting young people who either rent vacant houses for a bash or just sneak in.

In San Diego County, California, Sheriff’s Office Detective Jeff Lauhon says some well-organized entrepreneurs were asking real estate professionals for tours of large foreclosed homes in remote places. While touring the property, they would open a window or unlock an outside door, so they could return and throw a party.

“It turned into a business venture. They were charging admission to cover the cost of alcohol and to make a good profit,” Lauhon says.

In Tempe, Ariz., another party town, patrol officers have been assigned lists of foreclosed homes so officers can make sure nothing is going on, says Sgt. Steve Carbajal.