; and (2) by adding at the end the following new paragraph: (4) (A) The amount specified in this paragraph is $30,000,000, as adjusted pursuant to this paragraph. (B) (i) The Secretary shall develop, through regulations, a mechanism to adjust the amount under subparagraph (A) to account for relevant factors relating to construction, cost of land, real estate, economic conditions, labor conditions, inflation, and other relevant factors the Secretary considers necessary to ensure such amount keeps pace with all economic conditions that impact the price of construction projects, to include planning, management, and delivery of the project. (ii) In developing the mechanism under clause (i), the Secretary may— (I) use a mechanism or index already relied upon by the Department for other relevant programs, a mechanism or index used by another Federal agency, or a commercial mechanism or index if such mechanism or index satisfactorily addresses the intent of this subparagraph; or (II) create a new mechanism or index if the Secretary considers it appropriate and necessary to do so. (C) (i) Not less frequently than once every two years, the Secretary shall— (I) adjust the amount under subparagraph (A)