ANSWER:

The detective goes to all the floor and open the window before tossing the coin that means all the windows were closed.

now if the committed suicide then he will not be able to close the window after jumping

that means someone pushed him out of the window and after that closed the window

It all so means the man cannot jumped from the balcony may be balcony has some railings or high wall or locked etc that prevented him from jumping from it.

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