(a) If a project cannot proceed to actual construction because comparable replacement sale or rental housing is not available, and it is determined by the acquiring agency that housing cannot otherwise be made available to the displaced person, the agency may take action necessary or appropriate to provide housing by use of funds authorized for the project.
(b) No displaced person shall be required to move from his or her dwelling on account of any project, unless the agency head is satisfied that replacement housing, in accordance with subdivision (2) of subsection (c) of Section 18-4-7, is available to the person.