How much is the percentage changing of the original’s areas?, meaning they have

How much is the percentage changing of the original’s areas?, meaning they have

How much is the percentage changing of the original’s areas?, meaning they have created new spaces from the original drawing which I put (the changing) them in the auto-cad drawing. For example, offices, restrooms, and IT room.
There are 3 buildings in the CAD drawing A, B, and C.
We will ONLY focus on A and B, building A has 3 floors and building B has 4 floors.
I will upload the Auto-Cad drowning and the picture drawing while you find notes in the picture drawing like: –
– OPEN OR File meaning there is no change for the space.
– AHU means Air handling unit.
– Others are known. For example, offices, restrooms, and IT room.
THE QUESTION IS:
I will give you an example, and will upload a picture (formula) to show how you will measure the % change for each floor in buildings A and B, and if there is no change you don’t need to measure.