Engineers question city-approved plans after Brooklyn building collapse

Key Points:

• City-approved excavation plans for the collapsed Brooklyn apartment building did not require additional bracing to support the adjacent structure, instead specifying a 45-degree soil cut away from the foundation; all other surrounding buildings required steel buttresses known as rakers.
• The collapse resulted in eight deaths and 18 injuries, raising safety concerns as the development team had previously ignored a stop-work order; structural engineers reviewing the plans expressed surprise that extra shoring was not mandated, especially given the building's age and poor condition.
• The Department of Buildings defended the approved plans as standard industry practice and stated the project engineer is responsible for ensuring safety before submission; investigations are ongoing, focusing on the geotechnical report and overall excavation support.
• The collapsed building site was the only location without steel support in the approved plans, with experts noting that while steel reinforcement is not always required if excavation avoids undermining foundations, improper digging depth or changes in design during construction could have contributed to the collapse.
• Following the tragedy, the Department of Buildings issued a full stop work order and is conducting sweep inspections of related construction sites, with the investigation expanded to 160 properties linked to six entities, while the special inspector contracted to monitor excavation withdrew after the collapse.