The Mayor may accept on behalf of the District of Columbia donations of services or gifts of real or personal property, tangible or intangible, which are made for the purpose of carrying out his functions under this subchapter. Gifts of money and the proceeds from the liquidation of any other gift shall be deposited in the General Fund of the District of Columbia as established in the Revenue Funds Availability Act of 1975. The Mayor shall use such donations and gifts to carry out the purposes of this subchapter.