32 C.F.R. § 34.13
(a) Acceptable contributions. All contributions, including cash contributions and third party in-kind contributions, shall be accepted as part of the recipient's cost sharing or matching when such contributions meet all of the following criteria:
(5) They are not paid by the Federal Government under another award, except:
(b) Valuing and documenting contributions—(1) Valuing recipient's property or services of recipient's employees. Values shall be established in accordance with the applicable cost principles in § 34.17, which means that amounts chargeable to the project are determined on the basis of costs incurred. For real property or equipment used on the project, the cost principles authorize depreciation or use charges. The full value of the item may be applied when the item will be consumed in the performance of the award or fully depreciated by the end of the award. In cases where the full value of a donated capital asset is to be applied as cost sharing or matching, that full value shall be the lesser of the following:
(4) Valuing property donated by third parties.
(ii) Normally only depreciation or use charges for equipment and buildings may be applied. However, the fair rental charges for land and the full value of equipment or other capital assets may be allowed, when they will be consumed in the performance of the award or fully depreciated by the end of the award, provided that the grants officer has approved the charges. When use charges are applied, values shall be determined in accordance with the usual accounting policies of the recipient, with the following qualifications:
(5) Documentation. The following requirements pertain to the recipient's supporting records for in-kind contributions from third parties: