O’Donnell & Naccarato Offices

Philadelphia, Pennsylvania

Established in 1981, O’Donnell & Naccarato’s Philadelphia headquarters is the firm’s largest office and acts as a hub for national structural design and restoration projects.

  • 701 Market Street, #6000, Philadelphia, PA 19106
  • 215.925.3788

Mountainside, New Jersey

Established in 2013, O’Donnell & Naccarato’s Mountainside office primarily serves North Jersey projects and is located 20 miles west of Manhattan in Union County, one of the state’s most populated regions.

  • 200 Central Avenue, #202, Mountainside, NJ 07092
  • 908.379.2911

New York, New York

Founded in 2015 by O&N Principals, O’Donnell & Naccarato Structural Engineers is the Manhattan-based corporate affiliate of O’Donnell & Naccarato, Inc. that serves structural design and restoration projects in New York State. Seamless collaboration allows for nationwide service and access to more than 38 years of engineering experience.

  • 40 Worth Street, #301, New York, NY 10013
  • 646.315.7197

Carmel, Indiana

In 2019, O’Donnell & Naccarato established its Carmel, Indiana office with the acquisition of McComas Engineering. Since 1991, McComas, now known as McComas / O’Donnell & Naccarato, has earned a reputation for managing complex projects across the Midwest and beyond. The office is led by Vice President Rod McComas, PE, SE and Regional Director Tom Miltner, PE.

  • 1717 East 116th Street, #200, Carmel, Indiana 46032
  • 317.580.0402
Philadelphia, PA
701 Market Street,
Suite 6000,
Philadelphia, PA 19106
Mountainside, NJ
200 Central Avenue,
Suite 202,
Mountainside, NJ 07092


New York, NY
40 Worth Street,
Suite 301,
New York, NY 10013
Carmel, IN
1717 East 116th Street,
Suite 200,
Carmel, IN 46032