Partner with The Mark O'Brien Team — Your Trusted NYC Experts for Buying, Building, and Selling.
Having lived and worked in New York City for more than 30 years, The Mark O'Brien Team offers experience of the all-important, yet often imperceptible, nuances of each neighborhood. Finding the city's hidden gems is one of our greatest passions, and The Mark O'Brien is driven by creating real value on behalf of our grateful and loyal clientele.