About Us

We have deep roots in Contra Costa County.


Mount Diablo Realty and Property Management have served Contra Costa County for the last 63 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, a distinguished Licensed Realtor since 1993, elevated her expertise by achieving Broker status in 2004. In 2003, she founded Mount Diablo Realty, a testament to her entrepreneurial spirit and commitment to excellence in the Real Estate industry.

With a rich professional history, Raquel’s journey in Real Estate traces back to 1988, where she actively contributed to the success of the family business, Rath Realtors. As a third-generation Contra Costa Realtor and business owner, Raquel brings a unique blend of experience, tradition, and innovation to her practice.

Her extensive tenure in the industry reflects not only her deep-rooted connection to the local community but also her enduring commitment to providing top-notch Real Estate services. Raquel’s multifaceted background, coupled with her Broker status, positions her as a seasoned professional capable of navigating the complexities of the Real Estate landscape with finesse and expertise. Clients can confidently rely on Raquel’s wealth of knowledge and dedication to achieving their Real Estate goals.


Gina Ginochio

Realtor Associate

Gina, a lifelong resident of Contra Costa County, has held the esteemed title of licensed Realtor since October 1995. Her enduring commitment to the industry is exemplified by her early career at Rath Realtors, where she began her journey into Real Estate.

In October 2010, Gina transitioned her expertise to Mount Diablo Realty and Property Management, marking a significant chapter in her professional trajectory. This strategic move showcases her adaptability and dedication to providing comprehensive Real Estate services.

As a seasoned professional with a deep understanding of the local landscape, Gina’s longevity in the industry attests to her proficiency and reliability. Clients can trust in her wealth of experience, local insights, and commitment to excellence when navigating the intricacies of Real Estate transactions. Gina stands as a testament to the values of integrity, professionalism, and community focus that define her contributions to the Real Estate sector in Contra Costa County.

Jon Cogo Realtor

Jon, a seasoned Realtor Associate with a wealth of experience since 2004, proudly calls Contra Costa County his home since 1984. Drawing upon his executive background at Nordstrom, Jon seamlessly integrates his expertise in service to provide unparalleled assistance to his clients in every Real Estate transaction.

Demonstrating an unwavering commitment to professionalism, Jon places paramount importance on integrity, efficiency, hard work, and innovative service as the foundational pillars of his approach. These principles guide his interactions and decision-making throughout the entirety of his clients’ Real Estate dealings, ensuring a seamless and positive experience.

Jon’s continuous dedication to staying at the forefront of industry knowledge is evident in his commitment to ongoing Real Estate education. He actively seeks guidance from esteemed Real Estate coaches in Contra Costa County, a testament to his pursuit of excellence and commitment to offering the highest level of service to his clientele. With Jon at the helm, clients can trust in his expertise, integrity, and diligence to navigate the complexities of Real Estate transactions with confidence and success.