West Coyote Hills is a ridge lying mostly in northern Fullerton, including owned by Pacific Coast Homes (a land development division of the Chevron Corporation) that are the largest remaining tract of undeveloped land in north Orange County. The current development agreement calls for building houses on some of the land while donating the remainder to the city as a nature preserve. A group that supports keeping the entire area as open space/nature preserve qualified a referendum for a November 2012 election. In the election, voters approved Measure W, which would prevent development in the area. Ongoing lawsuits between the City of Fullerton (pro-development) and local conservationists (anti-development) have resulted over the interpretation of the measure. In February 2019, the California State Supreme Court denied a petition to review a lower court pro-development decision against Measure W. The City of Fullerton and The Friends of Coyote Hills are currently in competing negotiations with Chevron over either purchasing the land for development or donating the land for conservation with Chevron receiving tax credits and conservation funds in exchange for the donation.