Heffron performed mechanical construction for the Hotel Monaco, housed within the historic Old Tariff Building in Downtown Washington — a project that required fitting modern mechanical systems into a protected historic structure with strict preservation constraints and no tolerance for visible intrusion on the building’s character.

The work called for careful routing of piping, ductwork, and equipment through a landmark structure whose finishes and proportions could not be altered — a discipline that has defined Heffron’s historic renovation practice across the D.C. region.