No, it's about cities, and it's as old as street networks. Suppose your neighbour has a 30×30m corner plot and you build a five-story building 50cm onto your n

No, it's about cities, and it's as old as street networks. Suppose your neighbour has a 30×30m corner plot and you build a five-story building 50cm onto your neighbour's plot. The street isn't going to move, so you've just reduced the size of his possible six-story building by about 2%, and 2% of the value of a six-story downtown building is worth a lawsuit.