The Chino Hills Historical Society will host a presentation by Chino Hills resident and historian Paul Spitzzeri at 7 p.m. Monday, May 6 at Chino Hills Community Center, 14250 Peyton Drive.

Mr. Spitzzeri will provide a slide-illustrated presentation on the history of the 2,500-acre Tres Hermanos Ranch on both sides of Grand Avenue in Chino Hills and Diamond Bar, the last large piece of undeveloped land in the region.

In February, a historic agreement was made among the cities of Chino Hills, Industry, and Diamond Bar when the ownership of the land was transferred to the revised Tres Hermanos Conservation Authority of which all three cities are members.

Mr. Spitzzeri will talk about how the use of the land during the Spanish and Mexican period, and its usage as a ranch under several owners in the 19th and early 20th centuries, including the three brothers (Tres Hermanos) who weren’t related but shared a genealogy of power and influence in oil, real estate and media.

Mr. Spitzzeri, a 22-year Chino Hills resident, is the museum director at the Workman and Temple Family Homestead Museum in the City of Industry. He maintains a blog on Carbon Canyon history and writes a monthly column for the Champion.

The Chino Hills Historical Society is a non-profit organization funded through memberships and donations.Information: 597-6449 or email

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