About Us

We have deep roots in Contra Costa County


Mount Diablo Realty and Property Management have served Contra Costa County for the last 56 years. In 1960 our grandfather, Donald Rath, started Rath Realtors and the Contra Costa Board of Realtors. Our father, Donald Rath Jr., took over Rath realtors in 1977 until he retired in 2014.
Since then, we have helped thousands of buyers and sellers make successful connections. Mount Diablo Realty and Property Management take pride in understanding the communities it serves and in the deep historical relation we have with Contra Costa County.

Who We Are


Raquel Rath

Raquel has been a Licensed Realtor since 1993 and became a Broker in 2004. She started Mount Diablo Realty in 2003. Raquel has worked with the family business, Rath Realtors, since 1988. She is a third-generation Contra Costa Realtor and business owner. 


Gina Ginochio

Realtor Associate
Gina has been a lifelong resident of Contra Costa County, and a licensed Realtor since October of 1995, when she began working for Rath Realtors. In October of 2010, she went to work for Mount Diablo Realty and Property Management.

Jon Cogo

Realtor Associate/Partner

Jon, a licensed Realtor Associate since 2004, has been a resident of Contra Costa County since 1984. With his background as a former executive at Nordstrom, he applies his expertise in service to his clients in every Real Estate transaction. Jon prioritizes integrity, efficiency, hard work, and innovative service as fundamental elements of his approach. He strives to incorporate these values into every aspect of his client’s Real Estate dealings. Jon’s dedication to his Real Estate education is evident, as he has received guidance from esteemed Real Estate coaches in Contra Costa County.