Board up your vacant buildings, please.

Police are asking property owners in The City to do whatever it takes to keep members of the Occupy SF movement from squatting.

The global Occupy movement against economic disparity has apparently changed tactics in San Francisco, police say, as rumors swirl about a May 1 takeover of an undisclosed property.

“So please help us out by fencing, boarding, covering, etc your vacant property,” Northern Police Station Capt. Ann Mannix said in a community newsletter released Friday.

The warning comes after 75 demonstrators were arrested earlier this month for taking over a Turk Street building owned by the Archdiocese of San Francisco. They put up banners and scrawled anti-corporate and anti-police slogans on walls, police said.

Police spokesman Sgt. Michael Andraychak has said thousands of dollars in damage was done to the building.

On Jan. 20, Occupy demonstrators took over an empty Cathedral Hill hotel, leading to 20 arrests. A nearby Lamborghini dealership also was vandalized.

maldax@sfexaminer.com