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About Us

 Marathon Group LLC provides Owner’s Representation & Project Management oversight for all size jobs.  No project is too small or too large whether it’s clubhouse renovations, pool renovations, commercial renovations or industrial renovations within New York, New Jersey or Connecticut.  Each undertaking gets the detailed attention that it needs to ensure the work is performed correctly, timely and on budget. We offer your team process and technical expertise to help you make the thousands of decisions required throughout the project and in a timely manner.

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Michael Sullivan



Michael Sullivan began his career in NYC commercial real estate working as an operating engineer. He quickly moved up the ranks beginning as a Property Manager, then an SVP of Operations and recently as an Executive Director of Asset Management.  Throughout his career, he has worked on large capital projects including hundreds of tenant build-outs, new building lobbies, elevator modernizations, HVAC plant equipment replacement, new roofs & cooling tower equipment, to name a few.

Because of this hands-on approach to managing work, Michael has gained a reputation as being thorough, asking the right questions to maximize the greatest value in every project, and saving his clients time and money.  Michael has learned throughout his career that more time and effort put into the early stages of a project will result in a smoother outcome, eliminating any potential ambiguity and therefore saving time.

We work hard to understand why a project is being built and what it is intended to do.  We focus on the vision of the people who will occupy the building and use it every day, unlocking the real value of the project.

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“Good business leaders create a vision, articulate the vision, passionately own the vision, and relentlessly drive it to completion.”

Jack Welch

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