; and (D) in paragraph (11), by striking lease— and all that follows through the period at the end and inserting unless such lease meets the terms and conditions established by the Secretary . (b) Deadline for development or choice of new index; interim index (1) Deadline for development or choice of new index Not later than 1 year after the date of enactment of this Act, the Secretary of Housing and Urban Development shall develop or choose 1 or more methods of indexing as required under section 2(b)(9) of the National Housing Act ( 12 U.S.C. 1703(b)(9) ), as amended by subsection (a) of this section. (2) Interim index During the period beginning on the date of enactment of this Act and ending on the date on which the Secretary of Housing and Urban Development develops or chooses 1 or more methods of indexing as required under section 2(b)(9) of the National Housing Act ( 12 U.S.C. 1703(b)(9) ), as amended by subsection (a) of this section, the method of indexing established by the Secretary under that section before the date of enactment of this Act shall apply. 3. Hud study of factory-built housing (a) Definitions In this section: (1) Factory-built housing The term factory-built housing includes manufactured homes and modular homes. (2) Manufactured home The term manufactured home means any home constructed in accordance with the construction and safety standards established under the National Manufactured Housing Construction and Safety Standards Act of 1974 ( 42 U.S.C. 5401 et seq. ). (3) Modular home The term modular home has the meaning given the term in section 1027(c) of the Consumer Financial Protection Act of 2010 ( 12 U.S.C. 5517(c) ). (b) Study The Secretary of Housing and Urban Development shall conduct a study and submit to Congress a report on the cost effectiveness of factory-built housing, that includes— (1) an analysis of the reductions in costs from the centralization of manufacturing compared to the expense of transferring the unit from the factory to its final location