Although "machiya" (townhouses) had been around since the Heian period they began to be refined during the Edo period. "Machiya" typically occupied deep, narrow plots abutting the street (the width of the plot was usually indicative of the wealth of the owner), often with a workshop or shop on the ground floor. Tiles rather than thatch were used on the roof and exposed timbers were often plastered in an effort to protect the building against fire. Ostentatious buildings that demonstrated the wealth and power of the feudal lords were constructed, such as the Kamiyashiki of Matsudaira Tadamasa or the Ōzone Shimoyashiki.