Taken from the World Trade Center Register, this is a list of WTC tenants that worked in the areas of engineering and construction.

Engineering Services

  • America Bureau of Shipping (Floor 91 North Tower)

  • EQE International (Floor 52 North Tower)

  • Gibbs & Hill (Floor 91 South Tower)

  • John J. McMullen Assoc. Inc. (Floor 15 South Tower)

  • Mancini Duffy (Floors 15 and 22 South Tower)

  • Raytheon Engineers & Construction (Floor 93 North Tower)

  • Washington Group Intl. (Floor 91 South Tower)

General Contractors

  • Deerpath Construction of New York (South Tower)

  • IBN Group (North Tower)

  • Regional Alliance Small Contractors (Floor 38 North Tower)

  • Turner Construction Co. (Floor 38 North Tower)

Photo courtesy of the Federal Emergency Management Agency (FEMA), Washington, D.C.