The purpose of the authority granted under this subtitle is to: finance, refinance, or reimburse the cost of establishing, acquiring, designing, constructing, altering, or extending adequate infrastructure improvements as necessary for the development and use of land in any defined geographic region in the county, including storm drainage systems, sewers, water systems, roads, bridges, culverts, tunnels, sidewalks, lighting, parking, parks and recreation facilities, libraries, schools, transit facilities, and solid waste facilities; and provide a source of funding for payment of costs of: infrastructure improvements located in or supporting a transit–oriented development or a State hospital redevelopment; and operating and maintaining infrastructure improvements located in or supporting a transit–oriented development or a State hospital redevelopment. An infrastructure improvement financed under subsection (a)(1) of this section may be located: in the special taxing district; or outside the special taxing district if the infrastructure improvement is reasonably related to other infrastructure improvements in the special taxing district. For the purposes of this subtitle and any authority granted by this subtitle, a sustainable community, as defined in § 6–201 of the Housing and Community Development Article, shall be considered the same as a transit–oriented development.