Actually I counted 27 floors using the numbers on the construction hoist, then I took 1 floor away.
Although I cannot be 100%. - the top numbered floor on the construction hoist is 18, then the 19th floor of the construction hoist is boarded up.
My bad:
Construction hoist is numbered to floor #20 - boarded up floor is #21
So the Tower must be closer to the 27th to 28th floor
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