In some countries or jurisdictions, historic districts receive legal protection from certain types of development.Critics of historic districts argue that while these districts may offer an aesthetic or visually pleasing benefit, they increase inequality by restricting access to new and affordable housing for lower and middle class tenants and potential home owners.[12] In Taiwan, the Cultural Heritage Preservation Act [zh] protects certain historic districts under the "groups of buildings" category.Many jurisdictions within the United States have specific legislation identifying and giving protection to designated historic districts.Iranian Heritage and Tourism organization has nominated and selected several cities for their valuable historical monuments and districts.