2 C.F.R. § 200.449
(b) Capital assets.
(c) Requirements for all recipients and subrecipients.
(7) The following conditions must apply to debt arrangements over $1 million to purchase or construct facilities unless the recipient or subrecipient makes an initial equity contribution to the purchase of 25 percent or more. For this purpose, “initial equity contribution” means the amount or value of contributions made by the recipient or subrecipient for the acquisition of facilities prior to occupancy.
(ii) The recipient or subrecipient must impute interest on excess cash flow as follows:
(d) Additional requirements for states, local governments and Indian Tribes. For interest costs to be allowable for states, local governments, and Indian Tribes, the recipient or subrecipient must have incurred the interest costs for buildings after October 1, 1980, or after September 1, 1995, for land and equipment.