The Board of Playground and Recreation Commissioners shall have the power to declare a forfeiture of any grant made under this article, upon the neglect, failure or refusal by the grantee thereof to comply with any of the terms or conditions of the grant, and that upon such forfeiture, any and all buildings, structures and improvements of whatsoever character erected, installed or made under, through or because of, or pursuant to the terms of the grant, shall immediately, ipso facto become the property of the City, and every such grant shall so provide.