I think there are limits on both. Floor area ratio (https://en.wikipedia.org/wiki/Floor_area_ratio https://en.wikipedia.org/wiki/Floor_area_ratio) is how it is

I think there are limits on both. Floor area ratio (https://en.wikipedia.org/wiki/Floor_area_ratio https://en.wikipedia.org/wiki/Floor_area_ratio) is how it is coded into regulations. The lot size and the height restrictions create a bounding box that the building needs to fit within.