STONE did their due dililgence to ensure that the building's retaining walls can support the weight of the new steel frame to support the extension of the elevator. 

STONE ensured that the new steel that was going to be installed at the roof of 537 Broadway was coated to protect against future weathering and not loose stability. Structural steel bolting was also utilized to secure the structure from failure.

STONE made sure all new steel connections were reinforced more than required to achieve long standing stability in any situation of building movement or weather related instances.

The existing building retaining wall parapet had to be re-built to incorporate the new steel and utilize the new parapet as a seat for the steel to bear on. Upon the installation and completion of the new parapet, the steel was in place and well supported for the extension of the elevator into the sub-cellar and its upgrade.