It is just a simple mezzanine floor system, you can use it is as office or storing goods without any racking shelves.
1. What is you warehouse size(length *width *height) /Could you send me your warehouse drawing?
2. How many levels you want? And what is the height of each level? In the left picture, it is 2 levels: Ground floor + mezzanine floor.
3. What is the load capacity of the mezzanine floor? (kg / per square meter)