Structural Assessment for Roof Replacement

I need a comprehensive inspection of a 1950s building with a partially collapsed roof. The goal is to determine if the exterior structure can be salvaged and if a new roof can be installed. Also, information if a 2nd floor can be added... (Budget: $750 - $1500 USD, Jobs: Architecture, AutoCAD, Building Architecture, Building Design, Building Inspection, Building Regulations, Civil Engineering, Construction Engineering, Report Writing, Structural Engineering)