748.
The Palace of the prince must have a piazza in front of it.
Houses intended for dancing or any kind of jumping or any other
movements with a multitude of people, must be on the ground- floor;
for I have already witnessed the destruction of some, causing death
to many persons, and above all let every wall, be it ever so thin,
rest on the ground or on arches with a good foundation.
Let the mezzanines of the dwellings be divided by walls made of very
thin bricks, and without wood on account of fire.
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