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n the heart of New York City, a legacy of luxury real estate expertise has been unfolding for over two decades. Mark O'Brien's journey as a visionary developer and trusted advisor began with a personal passion project - a whimsical treehouse built for his five children. This 400-square-foot masterpiece perched on three trees sparked a chain reaction that led to the acquisition of a waterfront property in Greenwich, Connecticut.

    Mark's innate ability to transform properties into dreamlike spaces was showcased when this home sold for an astonishing million dollars above asking price. This remarkable feat demonstrated his unparalleled skill in elevating a property's value and cementing his reputation as a master of the industry.

    As a seasoned real estate veteran with over 30 years of experience navigating New York City's neighborhoods, Mark brings an unmatched level of insight to every transaction. His deep understanding of the city's hidden gems allows him to uncover opportunities that others may overlook, creating real value for clients.

    At Mark O'Brien Real Estate, precision and transparency are paramount. The firm provides accurate home valuations through its proprietary comparative market analysis tools, giving clients confidence in an ever-changing market. Whether buying, selling, or evaluating a property, Mark's team is dedicated to offering expert guidance and support.

    Mark's development projects reflect his unwavering commitment to understanding the intricacies of every property. By identifying opportunities that others may miss, he has successfully led over $375 million in real estate transactions, including ground-up construction and luxury renovations worth more than $65 million.

    With a team of skilled professionals by his side, Mark O'Brien Real Estate is dedicated to delivering exceptional results with no surprises. As Mark himself says, "Real estate is about creating value for clients. We're here to offer the expertise you need to make informed decisions about buying, selling, or understanding your home's true potential."