No later than the sixteenth day of January, the mayor shall submit to the council, the comptroller, the borough presidents and the city planning commission and publish a preliminary certificate setting forth the maximum amount of debt and reserves which, in the mayor's opinion, the city may soundly incur for capital projects during the ensuing fiscal year and during each of the following three fiscal years, and the maximum amount of appropriations and expenditures for capital projects which the city, given such maximum amount of debt and reserves, may soundly make during each such fiscal year. At any time up to the submission of the executive capital budget to the council, the mayor may amend such preliminary certificate. Any such amendments shall be submitted to the council, the comptroller, the borough presidents and the city planning commission, and published forthwith in the City Record.