New Yorkers understand the value of real estate and for over 50 years, the Duell family has worked to maximize the value of properties city-wide. Drawing from our decades of real estate ownership and management experiences, Duell has developed an extremely effective, highly flexible management philosophy and specific management systems that will not only improve your building as a place to live and work, but also as the investment it can be. Looking to stay atop day-to-day operations? Prefer a more hands-off approach? Is your building privately owned or a co-op? We at Duell Management Systems understand that with each building, comes a unique set of circumstances. Rely on our knowledge, integrity and commitment to custom-design a management system that best suits you and your building.