(c) The Secretary is also authorized to make grants to assist in the initial staffing of any public or nonprofit
REHABILITATION facility constructed after the date of enactment of this section (whether or not such construction was financed with the
aid of a grant under this section) by covering part of the costs (determined in accordance with regulations the Secretary shall prescribe) of compensation of professional or technical personnel of such facility
during the period beginning with the commencement of the operation of such facility and ending with the close of four years and three months after the month in which such operation commenced.