A method of constructing a building: comprising the steps of: a. building of multi stacked column using a machine with hydraulics to suspend an upper column module above a lower column module and an arm attached to column modules between the separated column modules (2, 4), insert columns between the separated columns, b. building of gateway support structure around said multi-stacked columns that stabilises the said mult-stacked columns, c. building steel framework floor platforms (28, 30) at ground level and then lifting them using cable hoist, d. passing said steel platforms (28,30) through the gateway support structure, the gateway support structure comprising a process ot opening and closing different parts so that it remains attached to the multi-stacked columns while also creating an opening, employing gateway support structure able to open upper and lower horizontal gateway connections to the multi-stacked columns separately, the support gates being opened and beginning to shift sideways, one end of the lower or upper horizontal gateway support structure being connected to the vertical multi-stacked columns, access being provided by opening the alternative gate end, the horizontal steel framework floor platforms (28,30) then entering into the gateway support structure, after entry is made the opened gate being closed and the alternative gate end being opened allowing the steel framework floor platforms to pass through the gateway support structure. e. locking the steel framework floor platforms (28 30) to the multi-stacked columns, f. strengthening of the steel framework floor platforms (28 30) with concrete. a. building of multi stacked column using a machine with hydraulics to suspend an upper column module above a lower column module and an arm attached to column modules between the separated column modules (2, 4), insert columns between the separated columns, b. building of gateway support structure around said multi-stacked columns that stabilises the said mult-stacked columns, c. building steel framework floor platforms (28, 30) at ground level and then lifting them using cable hoist, d. passing said steel platforms (28,30) through the gateway support structure, the gateway support structure comprising a process ot opening and closing different parts so that it remains attached to the multi-stacked columns while also creating an opening, employing gateway support structure able to open upper and lower horizontal gateway connections to the multi-stacked columns separately, the support gates being opened and beginning to shift sideways, one end of the lower or upper horizontal gateway support structure being connected to the vertical multi-stacked columns, access being provided by opening the alternative gate end, the horizontal steel framework floor platforms (28,30) then entering into the gateway support structure, after entry is made the opened gate being closed and the alternative gate end being opened allowing the steel framework floor platforms to pass through the gateway support structure. e. locking the steel framework floor platforms (28 30) to the multi-stacked columns, f. strengthening of the steel framework floor platforms (28 30) with concrete.