Donald Bren helped protect 57,500 acres of California’s historic Irvine Ranch

Billionaire real-estate developer Donald Bren helped turn a significant portion of California’s historic Irvine Ranch into a vast network of protected public lands, with 57,500 acres now preserved as open space and parklands. The scale of the conservation effort has been documented by the Irvine Ranch Conservancy, the City of Irvine and the National Park Service, while historical reporting by the Los Angeles Times traces the federal landmark designation and the later expansion of protected land. The protected acreage represents roughly 60% of the original 93,000-acre Irvine Ranch, a sprawling property that extends across parts of Orange County from the Santa Ana Mountains toward the Pacific coast. Rather than remaining a privately controlled expanse, much of the land was transferred to public agencies to be preserved for recreation, wildlife and conservation.The transformation unfolded over decades.