In order to alleviate hardship on any recipient of a grant under section 291n ^[1] of this title (as in effect immediately before August 18, 1964) for a project for the construction of an experimental or demonstration facility having as its specific purpose the application of novel means for the reduction of hospital costs with respect to which there has been a substantial increase in the cost of such construction (over the estimated cost of such project on the basis of which such grant was made) through no fault of such recipient, the Secretary is authorized to make a loan to such recipient not exceeding 66⅔ per centum of such increased costs, as determined by the Secretary, if the Secretary determines that such recipient is unable to obtain such an amount for such purpose from other public or private sources.