The City Commission shall have power to determine, with or without a petition therefor, that the whole or any part of the expense of any public improvement or repair shall be defrayed by special assessments upon the parcels or property especially benefited and so declare by resolution. Such resolution shall state the estimated cost of the improvement, what portion of the cost shall be paid by special assessment, what portion, if any, shall be a general obligation of the City, the number of installments in which assessments may be paid, the interest to be charged, and designate the districts or land and premises upon which special assessments shall be levied. This Charter shall not be deemed to require the holding of any public hearing prior to the authorization or construction of the improvement. Such special assessments may be levied before, during, or after the making of the improvement.