David Costello
Luxury Homes & Estates San Francisco & The Napa Valley

David Costello
(415) 381-7300


David has always had a passion for real estate and selling luxury homes. He attributes his sales success to providing exceptional personal attention to his clients – which they expect and deserve.

David Costello is a 4th generation San Francisco native who grew up in an 'insurance family', the esteemed Costello Insurance Group. David spent most of his professional career as an executive in the Property & Casualty insurance business, where he created exclusive programs for High Valued Homes and Commercial Property Portfolios. In 1998, with the backing of Lloyd's of London, David founded the Sterling Programme for luxury homes, the first of its kind to include a competitive earthquake insurance endorsement.  David later became a top producing agent with AIG Private Client Group, and served on their Advisory Board in New York.  David's unparalleled success in the insurance business has provided him with an extensive network of personal relationships with High Net Worth individuals who rely on his expertise in luxury real estate, investment and asset protection. Building on years of trust and outstanding service, David has expanded his client offerings to include real estate sales, where he can apply his intimate knowledge of his client's properties through the Bay Area. He is able to utilize his years of sales and tough negotiating skills to deliver superior results.

David is proud to be associated with Golden Gate Sotheby's International Realty, whose highly respected brand and worldwide marketing network is a perfect fit for his existing affluent market clientele. Residing in San Francisco and having an offiice in Marin County is a perfect nexus for sales ranging from the SF Peninsula to the Napa Valley. David attended St. Ignatius College Prep in San Francisco, and has a uniquely intimate knowledge of the city's diverse and vibrant neighborhoods.

After graduating from Pepperdine University in Malibu CA, David has resided throughout the SF Bay Area in Los Altos Hills, Danville/Blackhawk, Tiburon, and currently San Francisco - and enjoys his Wine Country getaway in the Napa Valley. David currently resides on Nob Hill in San Francisco. He is a pillar of his community, and an active supporter of many charitable events in the City. David is a proud father of 3 children, all of which live close by in the Bay Area. In addition to real estate, David's passions include travel, gourmet dining, fine wines and spending time in the Napa Valley.