Sean Mayer

Sean Mayer is the Founder and Principal of Legacy Real Estate Ventures, LLC, which he established in 2009 as the investment arm for the Mayer Family Office. Born in Los Angeles, he showed an entrepreneurial streak early: by his own account, before the age of 15 he had built and sold two Internet auction houses to a subsidiary of eBay. He describes his work as building on "three generations of real estate DNA" within his family.

Mayer was educated in San Diego, where he remains based. He graduated Cum Laude from the University of California, San Diego with a Bachelor of Science in Urban Studies and Planning, and later earned a Master's in Real Estate Science, with distinction, from the University of San Diego. Early in his career he was involved in managing a roughly 1,700-acre development in Ventura, California.

Under Mayer, Legacy Real Estate Ventures has focused on single-family residential rehabilitation, urban infill development driven by demographic analysis and proprietary analytics, and vertically integrated ventures. The firm reports having transacted over $1.75 billion of single-family residential assets since 2009, and frames part of its mission around neighborhood revitalization and assisting families facing foreclosure. Alongside the core real estate business, Mayer has pursued proptech, including HouseCall, a mobile app connecting homeowners and construction/service providers, and modular-housing initiatives.

Mayer is a recognized figure in the San Diego real estate community. He received San Diego Metro's "40 Under 40" award (2015), was recognized with the "Top 100 Family Office Elite Award" from Sato Consultants, and has been a recurring speaker and moderator at industry conferences run by Opal Financial Group, IMN, and FICON. He is active in philanthropy and mentorship, including the University of San Diego Real Estate Mentorship Program, the UC San Diego Alumni Association, the Circle of Care Burn Foundation, and the East Bali Poverty Project.

• Invests primarily as a principal/family office in real estate, not as a conventional tech angel — deploying the Mayer Family Office's capital directly into property acquisition and development rather than writing standard venture checks.
• Core strategy: single-family residential rehab and urban-infill development in supply-constrained Southern California submarkets, selected using demographic analysis and proprietary analytics.
• Applies what the firm calls a "venture capital approach to real estate," including vertical integration — building or backing operating businesses (construction, technology, modular housing) that support the core real estate portfolio.
• Proptech/construction-tech interest is adjacent to the real estate thesis: ventures like the HouseCall app were pursued to integrate with homeowner and construction workflows rather than as pure financial bets.
• Geographic conviction is concentrated: San Diego, Ventura/Camarillo, and Palm Springs/Rancho Mirage, reflecting deep local market knowledge.