Section 242(c) of Pub. L. 99–514 provided that:

“(1) In general.—Except as provided in paragraph (2), the amendments made by this section [amending sections 1082 and 1250 of this title and repealing this section] shall apply to that portion of the basis of any property which is attributable to expenditures paid or incurred after December 31, 1986.

“(2) Transitional rule.—The amendments made by this section shall not apply to any expenditure incurred—

“(A) pursuant to a binding contract entered into before March 2, 1986, or

“(B) with respect to any improvement commenced before March 2, 1986, but only if not less than the lesser of $1,000,000 or 5 percent of the aggregate cost of such improvement has been incurred or committed before such date.