This is a side view of the return and supply air.
I was able to meet most of the demands for the first floor of the buildings.
I thought I would be able to do an entire floor but I soon realized this would be very challenging so I decided to focus on three main rooms.
Heating and Cooling Strategy: I decided to use a VAV dual duct that would handle the cooling and heating of the building. In order to coordinate the different ducts on the same floor, I used different elevations. This became a bit tricky when I had to stay consistent between the terminal and the ducts. In theory, there is a mechanical room on each floor that will take care of processing the air.