Favourable conditions for the development of towns in northern central Lithuania occurred only as late as the 15th and 16th centuries. In the 16th and early 17th centuries, some settlements developed into small towns of the Grand Duchy of Lithuania. It was at this time that a mixed urbanistic system with a radial street network and a rectangular market square formed. The absolute majority of 16th to 18th-century buildings in the towns of the Šiauliai Crown Estate, just as in most of the Grand Duchy of Lithuania, were built of timber. Only from the early 17th century did the construction begin of brick buildings intended for religious or public purposes (such as the town hall in Joniškis). A more distinct separation between the development of towns can be made on the basis of the specific features of finds. These are finds related to trade, handicrafts and business: coins and hoards of coins, certain types of pottery, tiles, and work tools related to specific handicrafts, products and materials.