This is the outside of a traditional Kyoto townhouse, a "kyomachiya" (京町家). The white curtain (called a noren; のれん) on the right side indicates that this, like many old townhouses, has a store in the front part facing the street. The back, private part of the house is where we saw the garden yesterday.
The little section sticking out from the rest and with a small projecting roof is a window of wooden slats. It is cleverly designed so that it is hard to see inside the darkened house, but easy to see outside, providing both light and privacy. Also notice the angled slats on the lower part of the house. Traditionally made of bamboo, these are used to keep dogs from using the side of the house as a restroom!