And what people do is they develop their home on one or two stories, and they sell their loggia or roof rights, and someone else builds on top of their building, and then that person sells the roof rights, and someone else builds on top of their building.
一階建てとか 二階建ての自宅を建てたら 天井の権利を売り それを買った誰かが上に また家を建てます またその人が屋根の権利を売り 別の家が上に建つのです