(1) where the complex is a multiple unit residential complex,(a) 50% of the estimated tax for the complex, where the construction or substantial renovation of the complex was, on 1 July 1992, more than 25% completed and not more than 50% completed, or
(b) 75% of the estimated tax for the complex, where the construction or substantial renovation of the complex was, on 1 July 1992, more than 50% completed; and
(2) where the complex is a unit held in co-ownership in a complex held in co-ownership,(a) 50% of the estimated tax for the unit, where the construction or substantial renovation of the complex held in co-ownership in which the unit is situated was, on 1 July 1992, more than 25% completed and not more than 50% completed, or
(b) 75% of the estimated tax for the unit, where the construction or substantial renovation of the complex held in co-ownership in which the unit is situated was, on 1 July 1992, more than 50% completed.