Tres Hermanos Conservation Authority

The Cities of Chino Hills, Diamond Bar, and Industry, after reaching a settlement on six outstanding lawsuits in February of 2019, now work jointly to protect the 2,445-acre Tres Hermanos Ranch located in Chino Hills and Diamond Bar. 

Ownership of Tres Hermanos Ranch

Tres Hermanos Ranch is owned by the Tres Hermanos Conservation Authority, a joint powers authority with the cities of Chino Hills, Diamond Bar and Industry.  The City of Industry transferred to property to the Authority on February 11, 2019 as part of the settlement agreement between the three cities.

Tres Hermanos JPA

According to the terms of the Settlement Agreement approved February 5, 2019, the existing Tres Hermanos Conservation Authority Joint Powers Agreement was amended and restated to create a newly re-constituted Tres Hermanos Conservation Authority pursuant to the Joint Powers Act, Government Code sections 6500 et seq., (the "Tres Hermanos JPA"), which Authority will, among other things:

  • Include the cities of Chino Hills, Diamond Bar and Industry as Members of the Authority;
  • Create a seven (7) member governing Board of Directors comprised of two (2) Members from Chino Hills, two (2) Members from Diamond Bar and three (3) Members from Industry;
  • Provide that any proposed use of the property must be approved by the Board of Directors and be consistent with the Deed Restriction and applicable land use regulations of the cities of Chino Hills and Diamond Bar; and
  • Include additional provisions for administration, voting rights, budgeting, and distribution of operating revenue and expenses concerning the Authority.
  • For additional information, review documents from February 5, 2019 City of Chino Hills Special Meeting.

About the Tres Hermanos Conservation Authority

The Tres Hermanos Conservation Authority (Authority) is a joint powers agency with representatives from the cities of Chino Hills, Diamond Bar, and Industry. The purpose of the Authority is to coordinate the overall ownership, maintenance and use of the 2,445-acre Tres Hermanos Ranch property through the collaborative efforts of its Member Agencies.

Visit the Tres Hermanos Conservation Authority website. 

Board Meetings

The Authority Board meetings are held on the second Wednesday of the month at 6:00 pm in the Windmill Community Room at Diamond Bar City Hall, 21810 Copley Drive, Diamond Bar, CA 91765.  

Consistent with the Governor’s Executive Order, members of the public are encouraged to participate and address the Authority during the public comment portion of the meeting via teleconference.

Members of the Authority and limited staff may be physically present for this meeting. If you would like to attend the meeting in person, please note that face coverings are required to be worn at all times.

View Most Recent Agendas  |  View All

Tres Hermanos Conservation Authority CEQA Filings

Tres Hermanos Conservation Authority Official Records

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Background

Tres Hermanos Ranch is 2,445 acres: 1750 acres in the City of Chino Hills and 695 acres in the City of Diamond Bar. The land is located on both sides of Grand Avenue at Chino Hills' western border, and to the north extending into the City of Diamond Bar. City of Industry's Redevelopment Agency (RDA) originally bought the ranch in 1978. After the State of California dissolved RDAs in California in 2012 and required the sale of all assets, the City of Industry was approved to purchase Tres Hermanos Ranch from the RDA Successor Agency in 2017 for $41,650,000.

The City of Chino Hills and the City of Diamond Bar were concerned about the City of Industry's plans to build a massive solar facility on the property. In a historic effort to protect one of the largest expanses of open land in the region, the Cities of Industry, Chino Hills, and Diamond Bar reached a settlement on six outstanding lawsuits in February of 2019 and now work jointly to protect the 2,445-acre Tres Hermanos Ranch located in Chino Hills and Diamond Bar.

February 5, 2019 - Cities of Industry, Chino Hills, and Diamond Bar Reach Historic Settlement - Seek to Protect 2,445 Acres - Joint Press Release (PDF)

February 5, 2019 - Special Meeting of the Chino Hills City Council
Agenda and Documents

November 2, 2017 - City of Chino Hills Files Second Lawsuit Against City of Industry
On November 2, 2017, the City of Chino Hills filed a second legal action against City of Industry and other related agencies involved in the sale of the Tres Hermanos Ranch for failure to conduct a California Environmental Quality Act review, Gift of Public Funds, and Due Process Violations. The City of Diamond Bar has also filed a similar lawsuit.
Chino Hills Press Release 17-105 November 2, 2017 (PDF)
Diamond Bar Press Release - November 2, 2017 (PDF)

October 23, 2017 – City of Chino Hills Files Lawsuit Against City of Industry
Chino Hills Press Release 17-101 October 23, 2017 (PDF)
Diamond Bar Press Release – October 23, 2017 (PDF)