The property must be substantially rehabilitated. During a 24-month period selected by the taxpayer, rehabilitation expenditures must exceed the greater of the adjusted basis of the building and its structural components or $5,000. The basis of the land is not taken into consideration. It is important to note that any expenditure incurred by the taxpayer before the start of the 24-month period will increase the original adjusted basis. See Treasury Regulation 1.48-12(b)(2) for additional information.