“(6) To establish and maintain houses of refuge and other establishments for the support and relief of the destitute, and to subsidize institutions operating a hospital centre or charitable institutions established in the territory of the municipality or elsewhere in Québec;Such grants to such institutions operating a hospital centre or charitable institutions may be paid by equal annual instalments over a period of not more than 25 years, and, in such case, only the approval of the Commission municipale du Québec shall be required;