Erin O’Connor
CalBRE#: 01857244

Phone: (619) 847-3115

Erin O’Connor is a Licensed California Real Estate Broker. He has been involved in real estate and lending since 2001 as a broker, investor, and bank loan officer. He has over 15 years experience in the real estate industry and has spent the last 6 years buying and selling investment properties throughout the country.

Sustainable Realty Group grew out of the desire to pass along the knowledge learned from 6 years of buying and selling investment properties. SRGs main goal is to develop a real estate team that would not only understand and educate their clients on the principles of real estate agency, but also a team that could advise their clients in the areas of property improvement and finding solid investment opportunities. Sustainable Realty Group has an extensive network of vendors, contractors, and architects. This experience and knowledge allows SRG to go above and beyond to help our clients.

Erin is a San Diego native to San Diego and a graduate of the University of San Diego. He truly knows San Diego and wants to help you find or sell your next home or investment property. In his free time he enjoys playing soccer, traveling, and enjoying all that San Diego has to offer.


Antonio Gonzales
Broker Associate
CalBRE#: 01368061

Phone: (619) 889-8579

Antonio Gonzales is a Licensed California Real Estate Broker. He has extensive experience in complex contract negotiations and property analysis. Since 2002, Antonio has been involved in many aspects of the real estate and finance industry including net branch operations, residential sales, private mortgage lending, and nationwide distressed asset acquisitions/dispositions including over a hundred fix and flip projects in San Diego County. He is also a Certified Probate Real Estate Specialist.

This experience has expanded the network and resources he has available to give you the competitive advantage to accomplish your real estate goals. Antonio understands the intricacies of a real estate transaction and the diversity of the local San Diego real estate market, while having the ability to provide the personalized service that his clients have come to value as their trusted real estate advisor.

Antonio received an athletic & academic scholarship to the University of San Diego (USD) where he was captain of the USD Men’s Soccer Team & received his BA in Business Administration with an Emphasis in Supply Chain Management & a Minor in Spanish.

Antonio is honored to call San Diego “home”, and he absolutely loves America’s Finest City and all it has to offer.  His main hobbies & sports include traveling, yoga, running, snowboarding, beach volleyball, and live music events.


KC Rentfro
CalBRE#: 01932807

Phone: (858) 754-8564

KC has been involved in housing his entire life with his family business centered on construction and home renovations. Born and raised in Riverside California, KC earned an athletic scholarship to play NCAA collegiate baseball at UCSD. He is a proud graduate of the University of California San Diego where he received a degree in Communications. Upon graduation, he decided to pursue a career in real estate and hasn’t looked back.


KC’s ability to relate to people and build rapport allows him to create meaningful, trusting relationships. His personality brings out the best in people and allows them to enjoy the home buying process. His vast knowledge of the San Diego market makes him a crucial resource in determining the best location for his client’s needs and goals.


In his free time KC enjoys attending live sporting and music events, drinking craft beer, going to the beach, and playing golf. He takes great pride in his work ethic and ability to network within the industry to provide the best solutions for his client’s needs. KC’s drive, attitude and energy make him a valuable asset to any real estate transaction.

Cari Shaffer

Cari Shaffer
CalBRE#: 02017991

Phone: (760) 566-6250

Cari has been involved with real estate for the past 18 years starting as an investor in Arizona and California. She primarily focused on renovation projects and custom home builds for over a decade, but has expanded into the sales side including distressed properties, short sales, traditional listings, and is now specializing in probate real estate sales.

Cari understands the importance of relationship building and places emphasis on serving her clients. Cari worked in the service industry for many years while attaining a BS in Supply Chain Management from Arizona State University. Keeping service in the forefront, Cari climbed the corporate ladder as a contracts manager for American Express and then moved into the world of IT Staffing where she spent nine years in Account Management and Recruitment and obtained President’s Club status five of the seven years it was offered. The combination of service and business experience was the perfect platform to launch her career in real estate full time.

Cari enjoys spending time with her family and friends, skiing, biking, hiking, photography, singing, traveling and meeting new people.