About Us

FLAGG COASTAL HOMES is a licensed California Contractor, based in Coronado. It was founded  in 2007 to complement Flagship Properties development and brokerage activities. Flagship Properties is a privately held real estate development and brokerage company located in Coronado California. Founded in 1975, the company has developed, marketed and sold quality residential and office building developments throughout Southern California. Since 1998, Flagship has specialized in “Coastal Homes” primarily in Coronado.


John O'Brien of Flagg Coastal Homes
John O’Brien

John O’Brien founded FLAGG COASTAL HOMES as a Design Build Custom Homebuilder in response to the demand for nautically inspired homes in the resort town of Coronado California. John is a U.S. Naval Academy graduate, former Naval Officer (PT-Boat skipper, PTF-22) and a 37-year veteran of Southern California Real Estate Development, Brokerage and Construction. Most recently, John, his wife Carrie, and a small cadre of experienced and talented building professionals have successfully developed and sold 30 homes in Coronado in a 13-year span.


Carrie O'Brien of Flagship Properties
Carrie O’Brien

Carrie McColl O’Brien, a partner in FLAGG Inc. is the managing director of Flagship Properties an affiliated company, also based in Coronado. Flagship Properties (link) is a California licensed real estate broker. Carrie, not only markets and sells, FLAGG’s completed projects, but also provides brokerage and marketing services throughout Coronado Carrie is a Stanford University graduate and holds an MBA form UCLA.


Our Partners and Staff


Mark Toughest Mudder

At Flagg Coastal Homes, We Do Work.

Mark Blore
Mark Blore

Mark Blore joined the Coronado team in 2004. He is a licensed California Builder, and partner in FLAGG Inc. Mark is a former U.S.Navy Seal as well as a Coronado resident. His firm (BSC Inc.) is registered as a Disabled Veteran-Owned Small Business.


Martin Brown
Martin Brown

Martin Brown, also a licensed contractor, and a St. Lucia citizen provides Project Management Services for FLAGG Inc. Operating under the name of St. Lucia Builders, Martin’s firm will be recognized as a Minority-owned small business.



Sean O’Brien

Sean OBrien received his Bachelors degree in Management Sciences and Engineering and Masters Degree in Civil Engineering from Stanford University. Sean is currently the Marketing and Analytics Manager for Flaghsip and Flagg. He has provided journeyman level labor on over 10 Flagg projects in the last 6 years. He recently joined Kennedy Wilson, a real estate investment firm based in Beverly Hills.

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