Four of the signs, three of which resemble green directional freeway signs used by the California Department of Transportation, have been removed from two freeways, The Los Angeles Times reported Friday.
Mike van der Goes, general manager of the Rancho Palos Verdes club, told the Times that Trump and his company had no knowledge of the signs.
Local art group Heavy Trash, which caused a ruckus several years ago with signs advertising a fake subway route, also denied involvement, the newspaper said. The group, via e-mail, said that it advocates "urban solutions like housing, schools, public transportation, parks and pedestrian-friendly commercial development.
"We would never support something as wasteful as a new golf course within the Los Angeles Basin," the group's message said.