The narrowest shop in Amsterdam "the Small Trip-house" , 2.44 meters wide, at the Kloveniersburgwal. There is a nice legend about this house.
In the 17th century two brothers, Lodewijk and Hendrik Trip, who were very wealthy arms mercheants, built a grand canal-house for themselves on the Kloveniersburgwal. It was the largest house at that time. According to the legend one of the brothers heard a servant say that he wished he had a house as wide as their front-door. Then the eccentric Trip brother built the "Small Trip-house" for the lucky servant on the other side of the same canal. It is a nice story but probably not true, the big house was completed in 1662 and the small one in 1696, the two brothers were already dead by then.
You probably are curious what kind of shop there is, well it is situated in the "Red Light District" area, so they call themselves a "sexy avant-garde" fashion shop.