This is one of the medieval tower buildings in Regensburg, Germany that once belonged to a rich and powerful patrician family.
The actual living space was on the main level.
The upper stories were only a façade, with small storage rooms behind the upper windows.
Stone was expensive, so prosperity was displayed by the height of the tower you owned – the higher the tower, the more stones required and the wealthier the merchant.
Germans still say of someone they think is wealthy, “He is stone rich.”
Many such buildings remain in Regensburg and some owners have invested in renovating the upper levels and adding electricity. They can then rent the tiny spaces to students who are able and willing to climb the ladders between floors.
Note the varying window styles on the different levels of this tower.