32 C.F.R. § 37.540
May I accept fully depreciated real property or equipment as cost sharing?
You should limit the value of any contribution of a fully depreciated asset to a reasonable use charge. In determining what is reasonable, you must consider:
(a) The original cost of the asset;
(b) Its estimated remaining useful life at the time of your negotiations;
(c) The effect of any increased maintenance charges or decreased performance due to age; and
(d) The amount of depreciation that the participant previously charged to Federal awards.