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Posted on: February 6, 2019

Tres Hermanos Settlement Agreement Approved

During a special meeting held at 5:30 p.m. prior to its regularly scheduled meeting of February 5, 2019, the Diamond Bar City Council unanimously voted to approve a settlement agreement that resolves long-standing concerns regarding the future of Tres Hermanos Ranch.

This agreement between the Cities of Diamond Bar, Chino Hills and Industry brings to a close a 15-month legal battle that involved litigation challenging the sale of the Tres Hermanos Ranch from the Industry Successor Agency to the City of Industry and the Master Lease which contemplated the construction of a large solar generating facility on the 2,450 acres of undeveloped open space located along the eastern edge of the city between Diamond Bar and Chino Hills.


Three things are achieved with this agreement – (1) it resolves six pending lawsuits filed by the Cities of Diamond Bar and Chino Hills against Industry, (2) it amends the existing Tres Hermanos Conservation Authority Joint Powers Agreement (JPA) to create a newly re-constituted Tres Hermanos Conservation Authority, and (3) it paves the way for the purchase and sale agreement that transfers the Tres Hermanos Ranch from the City of Industry to the Conservation Authority. The purchase and sale agreement to transfer the Tres Hermanos Ranch to the Conservation Authority will limit the use of the property to “open space, public use or preservation”.

Under the amended JPA, this new Conservation Authority will have a seven-member governing board with seats filled by two Diamond Bar Council Members, two Chino Hills Council Members, and three Industry Council Members.


The City Council's for Chino Hills and Industry also approved the settlement agreement on February 5, 2019.


To view documents, visit the Tres Hermanos web page. 

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