Under these circumstances, za were also gradually changed. Some za tried to become a trade group independent of their honjo, or some tried to have closer ties to government offices and feudal lords to have them as their honjo, and some attempted to establish a hereditary privilege by limiting the number of members in their za.
こうした中で座も変質していき、本所から自立した営業集団に転化したり、官衙や領主との結びつきを強めて中にはこれらを新たな本所するものが出現したり、座衆の数を制限して世襲特権化を図ろうとした。