Hello,
My name is Arturo and I am an architect designer with extensive professional experience. In my profile you can see some examples of offices that I have done, both in design and rendering.
To start you would have to send me the CAD file. I don't know if that is the base design to make modifications and improvements or if you prefer a new design in that defined area. It is important to point out the main entrance to the office and it would be very helpful if you could also send me some pictures of the office in its current state.
I would start by making the 3D model in Revit, I would design the different environments, I would constantly send you images to receive your comments and be part of the design process. Once the design is to your complete liking, I would export the file to Lumion to make quality renderings.
Just write me through the chat so we can discuss the details of the project, such as: design style, necessary rooms, toilets, kitchenette, meeting room...
Sincerely, Arturo S., architect