In carrying out activities under section
1701z–1 of this title, the Secretary may undertake programs to demonstrate the most feasible means of providing assistance to localities in which a substantial number of structures are abandoned or are threatened with abandonment for the purpose of arresting the process of housing abandonment in its incipiency or in restoring viability to blighted areas in which abandonment is pervasive. For this purpose, the Secretary is authorized to make grants, subject to the limitations of this section, to assist local public bodies in planning and implementing demonstration projects for prompt and effective action in alleviating and preventing such abandonment in designated demonstration areas.