The items of cost toward which the Commission will not contribute include:

1. (a) Costs for the acquisition of any interest in land or buildings;
2. (b) Costs for the payment of items in excess of the participant's actual cost; and
3. (c) Costs determined not to be allowable under generally accepted accounting principles and practices or part 1-15, Federal Procurement Regulations (41 CFR part 1-15).