(a) The following is a list of some of the more frequently used allowable costs:
- (1) Historical, architectural, or archeological research necessary to implement and carry out project work;
- (2) Architectural, engineering, or contractor fees necessary to implement and carry out project work;
- (3) Supplies and materials, as indicated in the detailed project description;
- (4) Rental or lease of project equipment;
- (5) Exterior restoration; and
- (6) Structural repairs.