noun, noun or participle which takes 'suru'
Technical term used in law and urban planning for the process of an area becoming urbanized. Often appears in compounds like 市街化区域 (urbanization promotion area).
この地域は急速に市街化が進んでいる。
Urbanization is progressing rapidly in this area.
市街化区域に指定されると、開発が活発になる。
Once designated as an urbanization promotion area, development becomes active.