The sign, complete with official city and California seals, read: "Official Sanctuary City 'Cheap Nannies and Gardeners Make Malibu Great!' (Boyle Heights Not So Much.)"
Malibu city officials said the sign was not put up by the city.
A California State Parks employee reported the sign to authorities Tuesday, Malibu Councilwoman Laura Rosenthal said. The sign had already been taken down by the time deputies showed up to investigate.