• Mark O'Brien Development, LLC

    Buy | Build | Sell Advisor


    Lic. Real Estate Broker

    Lic. New Home Builder

    m. 917.485.4020



    LinkedIn / Youtube / Instagram



    The Mark O'Brien Team

    Real Estate

    As a dynamic and well-rounded real estate veteran, I bring a keen eye for value and opportunity to each and every engagement, attributed to my strong background in residential property development, building and business. Having lived and worked in New York City for more than 30 years, I offer experience of the all-important, yet often imperceptible, nuances of each neighborhood. Finding the city's hidden gems is one of my greatest passions, and am driven by creating real value on behalf of my grateful and loyal clientele.


    Mark O'Brien Real Estate Development

    Real Estate Developer - NYC, CT, NZ


    As a developer, a licensed New Home Builder and a licensed real estate professional, I pride myself on finding the right location, at the right time and at the right price, resulting in record-breaking sales and profits throughout New York, Connecticut and even New Zealand. Over the past ten years, my completed projects have won multiple awards, which illustrates my commitment to recurring and new clientele, and my research and knowledge of the ever changing real estate market.


    -11 Cove Rd, Old Greenwich CT (Pictured Above, Left) One of my last development projects in CT. Sold for $7,000,000. I purchased the original house damaged by Hurricane Sandy (2012) and built this Shingle Style 7,000 SF waterfront property.


    Broken Shed Vodka:

    After moving my family to New Zealand in 2008, the concept of 'Made in New Zealand' made it's mark as my newest inspiration. Greatly influenced by the incredibly clean and beautiful surroundings, I wanted to pack and ship a little taste to my friends back home. As a result, I founded Broken Shed Vodka in 2009, an internationally acclaimed vodka company. Created with water from the Southern Alps, solely renewable resources and without GMO's, additives, chemicals, gluten, and added sugars, it is the only award-winning vodka created as pure as New Zealand.


    Network Dynamics:

    One of my first entrepreneurial ventures in 1987, I founded Network Dynamics; a highly profitable executive search firm headquartered in New York City. Working with IT professionals in sales and programming positions, the business grew to $4M in revenue and quickly expanded into the contract programming industry. In 2001, Network Dynamics launched Eclaro, an IT contract consulting firm in New York City.


    Charitable Organizations

    As always, even my passion for charities is influenced by my children. At age 11 while living in New Zealand, my daughter was diagnosed with cancer. Ronald McDonald House became our temporary home, for which I am eternally grateful. With their support and medical advancements, my daughter is now entering her young adult years and loving life. In addition to Ronald McDonald House, I support the Cancer Research Institute in hopes of one day finding a cure.


    Family Man

    I am lucky enough to have a beautiful family of five children. We love to adventure, travel and explore new cities. Adventure is in the O'Brien blood, so we picked up and moved to New Zealand. Coming from New York City and Greenwich, CT, we appreciated the vastness of New Zealand and welcomed the change of pace. Although New Zealand will always have a place in my heart, New York City will always be my home. All of my ventures have been inspired by my children...maybe even the vodka.

  • Recent Deals

    207 St. James Place,

    Unit #2R,

    New York, NY


    3 Beds/ 1 Bath

    Sold for


    263 West 94th Street,

    Unit #123,

    New York, NY


    3 Beds/ 2.5 Baths

    Sold for


    321 East 12th Street, Unit #33,

    New York, NY


    2 Beds/ 1 Bath

    Sold for $875,000


    1 Bed/ 2 Baths

    Sold for $1,175,000


    1 Bed/ 1 Bath

    Sold for $1,412,500


    1 Beds/ 1 Bath

    Sold for $675,000


    2 Bed/ 1 Bath

    Sold for $649,000


    Alcove Studio

    Sold for $410,000


    1 Bed/ 1 Bath

    Sold for $390,000

  • Awards

    SoHo Specialist Certification

    Certified: Soho

    East Village Specialist Certification

    Certified: East Village

    Mark O'Brien Real Estate Award

    Home Building Industry Awards

    Spec Home of the Year

    Mark O'Brien Real Estate Award

    Home Building Industry Awards

    Best Spec Home Over $10 million

    Mark O'Brien Real Estate Award

    Home Building Industry Awards

    Best Library

    SIP Consumer's Choice Award

    Platinum and Gold

    International Wine and Spirit Competition Quality Award


    San Francisco World Spirits Competition




    Remix Magazine

    People/Lifestyle - Wanaka, New Zealand

    (feature on p. 144)

    The Huffington Post

    Taste - New York, New York

    Mark O'Brien home design

    Home Style Magazine

    Home Renovation - Wanaka, New Zealand

    Life and Leisure Magazine

    Life and Leisure - Wanaka, New Zealand

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