Station Park | 18, 28, 36, 40, 50 fl | U/C

[ijmorlan]

From my reading of children's books that talk about things like this (yes, you read that right), often a smaller crane is installed on the roof, the larger crane pieces are brought up to the roof, and then lowered down on the outside.  The smaller crane is then disassembled and taken down in the elevator.

I read about a condo in Toronto that had some sort of temporary crane mounted on it for years. I think it may have been used to take down the main construction crane, but they were waiting for part of the window washing system or something to arrive before they could take down the temporary crane.