Section, added Pub. L. 94–455, title II, § 201(a), Oct. 4, 1976, 90 Stat. 1525; amended Pub. L. 95–600, title VII, § 701(m)(1), Nov. 6, 1978, 92 Stat. 2907; Pub. L. 97–34, title II, § 262(a), (b), Aug. 13, 1981, 95 Stat. 264; Pub. L. 97–248, title II, § 207(a)–(d), Sept. 3, 1982, 96 Stat. 431, 432; Pub. L. 97–354, § 5(a)(24), Oct. 19, 1982, 96 Stat. 1694; Pub. L. 98–369, div. A, title I, § 93(a), title VII, § 712(c), July 18, 1984, 98 Stat. 614, 947, related to amortization of real property construction period interest and taxes.