Section, added Pub. L. 94–455, title XXI, § 2124(a)(1), Oct. 4, 1976, 90 Stat. 1916; amended Pub. L. 95–600, title VII, § 701(f)(1), (2), (7), Nov. 6, 1978, 92 Stat. 2900–2902; Pub. L. 96–222, title I, § 107(a)(1)(E)(ii), Apr. 1, 1980, 94 Stat. 222; Pub. L. 96–541, § 2(a), Dec. 17, 1980, 94 Stat. 3204, related to amortization of certain rehabilitation expenditures for certified historic structures.