I agree that the 5 floor rule doesn't make sense all the time, though the limits used should be linked to the width of the streets. I believe it's good to make

I agree that the 5 floor rule doesn't make sense all the time, though the limits used should be linked to the width of the streets. I believe it's good to make sure sunlight can reach every window for at least part of the day, though there's a certain charm to some narrow side streets too.