The Venetian Palace still keeps the signs of its origin as warehouse and then both as residence of noblemen and of merchants. Each palace has got two entrances, one on the water from which the goods get in, called bank, and the other one, on the land, usually led into a courtyard with its own well in the centre, for water supply. Besides, it is bizarre the fact that a town surrounded by water had several problems related to drinkable water. Such problems were solved by means of specific wells which had to collect rain water and filter it. On the ground floor, next to the entrance hall (andron) there is often the mezzanine floor: its sides were divided into two halves along their height, and they were used as business offices by the merchant. The side rooms of the entrance hall, on the first floor or piano nobile, were used as the residence of the owner. In the end, the attic was usually inhabited by his servants and merchantmen.