Not the floor area — anyone can multiply a plot by a ratio. Which rule stops you, because that is the only one worth paying to move.
How to use it: move the sliders and see which rule holds the building down, then press Apply this move to see what moving it is worth.
Same plot and zone. Grey bar: parking on grade. Lime bar: parking with a stilt level. Click a road to try it.
Limits. The bye-law is invented and the city does not exist. The shape of the rules is real; the numbers are nobody's.
A feasibility model, not a planning submission. It does not price land.