SeaRock Ventures

Established by Thayer Flynn, SeaRock Ventures stands out as one of San Diego’s leading urban infill real estate development firms. Drawing upon deep expertise in finance, real estate, construction, and entitlements, SeaRock excels in high-density infill projects throughout San Diego County.

SeaRock seeks out underutilized infill lots and properties with value-add potential, ideally situated near urban transit zones.


Thayer Flynn - CEO

Thayer Flynn, a highly skilled infill real estate developer with a diverse background in finance, accounting, and construction. Born into a family of builders and developers in San Diego, Thayer has been deeply involved in the world of real estate from a young age. His extensive experience and knowledge in the industry have made him a go-to person for unique and innovative urban infill housing projects in San Diego.

Thayer holds a Bachelor’s degree in Finance from the University of Southern California, which, combined with his background in construction and accounting, has given him the unique ability to manage the financial aspects of real estate projects with ease. He is a licensed broker by the CA Department of Real Estate (Lic. # 01760575), and his career is marked by award-winning multifamily development projects and value-add investments.

As a member and co-chair of the ULI San Diego Small Scale Infill Developer group, Thayer is passionate about creating sustainable and livable communities through infill development. He has a keen eye for identifying underutilized urban spaces and transforming them into beautiful, functional, and economically viable living spaces that meet the needs of the local community.

Thayer’s commitment to excellence, attention to detail, and dedication to his craft have earned him a reputation as a trusted and respected developer in the San Diego area. Whether working on new construction or renovation projects, Thayer’s goal is always to create housing solutions that enhance the quality of life for his clients and the community.

Legacy Thayer Flynn is a local San Diegan and is a father of 2 daughters.  Thayer’s San Diego roots are strong and his builder/developer/real estate investor roots are just as strong.

Thayer’s father Gregg Flynn is a high-end residential builder and developer and spent most of his career in San Diego before retiring to Albuquerque, New Mexico.

Thayer’s grandfather John Mortenson was a builder and developer and became well known in the local housing industry as an innovative designer and builder of custom-built homes… Over a period of twenty years, John designed and constructed over 200 custom-built houses in the San Diego area.

Thayer’s uncle, Chris Mortenson also a builder and developer was among the first to see the possibilities in revitalizing the Gaslamp Quarter. He is best known for his historical renovations, although he developed hundreds of condominiums and apartments and more than half a million square feet of industrial, office and commercial space.

In addition, Chris Mortenson is known for his relocation of the “Baby Del” to Coronado, which required the house to be brought across the San Diego Bay with approval from the Navy in 1985.

Megan Flynn - CFO

Megan Flynn is a highly accomplished professional with extensive experience in financial management, business processes, and project management. With over 15 years of experience in the field, she has established herself as a seasoned leader and an expert in her domain.

Throughout her career, Megan has held several senior positions in various organizations, where she has demonstrated her ability to lead teams and drive results. She has a proven track record of improving financial performance and operational efficiencies by implementing robust business processes and strategies.

Megan’s expertise in project management has enabled her to successfully manage complex initiatives and deliver projects on time and within budget. Her ability to manage stakeholder relationships and collaborate with cross-functional teams has been instrumental in achieving project success.

Lee Mills - VP Marketing

Lee Mills is a highly accomplished marketing and advertising professional with a wealth of experience in the industry. With a career spanning over two decades, Lee has established himself as a trusted and respected leader in the field, renowned for his strategic vision and ability to deliver results.

Lee began his career in marketing and advertising after stint in the US Navy.  He quickly rose through the ranks, gaining valuable experience in various roles across the industry, including account management, creative development, and media planning.

Lee is known for his exceptional leadership skills, and his ability to inspire and motivate teams to achieve their best. He has a keen eye for talent and has built and managed successful teams of marketing and advertising professionals throughout his career.