Durability is a system-level question
Steel grade alone does not determine how a complete building will perform. Structural design, connections, fabrication, protective finishes and operating conditions all matter. The responsible engineers should assess the actual location and intended use.
Fabrication and assembly
Traceable materials and documented inspections help establish how components were produced and installed. Later additions such as equipment, mezzanines or rooftop systems can change the loads and should be reviewed against the design information.
Protection and maintenance
Humidity, chemical exposure and weather conditions influence the protection strategy. Record coating damage and arrange access to vulnerable areas. Agree on inspection and repair methods that are appropriate to the building environment.