Notwithstanding any other provisions of this charter or the requirements of the general law of the State of Vermont, the City Council is authorized and empowered to negotiate and execute agreements between the City and taxpayers regarding assessment and taxation of taxable commercial and industrial property located within the City, subject only to requirements of the Vermont Constitution and the limitation that no agreement shall be for a term longer than 10 years. Any agreement entered into under this provision shall require approval by four members of the City Council.