Regional Authorities and Special Districts - As enacted, authorizes an industrial development corporation created by a housing opportunity county or by a municipality within the boundaries of the housing opportunity county or jointly by any combination of such entities to construct and install public infrastructure for qualified residential developments or contract with a private party for the construction and installation of such public infrastructure, and to accept and make certain loans and grants relative to such purposes. - Amends TCA Title 5; Title 6; Title 7; Title 13 and Title 48.