A coalition of environmental groups and a developer have agreed on a landmark plan to conserve 90% of the largest chunk of privately owned wilderness remaining in Southern California.

The agreement ends years of debate over the fate of an untrammeled tableau of mountains, wildflower fields, twisted oaks and Joshua trees in the historic Tejon Ranch in the Tehachapi Mountains, about 60 miles north of Los Angeles.

The developer, the Tejon Ranch Co., has agreed to set aside 178,000 acres and provide an option for public purchase of 62,000 additional acres — 49,000 to create a state park, 10,000 to realign a 37-mile segment of the Pacific Crest Trail through the heart of the wild lands and the rest to provide docent-led tours of sensitive habitat. It also will pull back development plans along some ridgelines considered crucial to the California condor.

In exchange, a coalition led by the Natural Resources Defense Council, the Sierra Club, Audubon California, the Planning and Conservation League and the Endangered Habitats League will not oppose the company’s plans to build three urban centers, including more than 26,000 homes as well as hotels, condominiums and golf courses at the western and southwestern edge of the ranch.

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