The document discusses several theories of urban planning and land use: (1) Garden city theory proposes planned cities that combine urban amenities with access to nature. Ebenezer Howard's model included separate zones for residents, industry, and agriculture surrounded by a rural belt. (2) Burgess' concentric zone theory describes a city growing outward from the CBD in concentric circles divided by socioeconomic status and land use. (3) Hoyt's sector theory argues cities develop in sectors influenced by transportation routes rather than concentric circles. (4) Multiple nuclei model describes urban growth spreading from several centers rather than just the CBD.