Although urban planning zoning systems define a commercial district as an agglomeration of commercial and business land, these days the number of high-rise apartments has increased in such areas. To prevent undesirable changes in the urban environment, through an excessive increase in housing, some cities implement residential development regulations in commercial districts. This study examines the current status of residential development regulations applicable to 434 commercial districts in Japan. The research concludes that conditional development directives will aid in implementing the various regulations applicable to commercial districts.
