The Islamic fundamentalists released chilling film of the man's final minutes after holding a 'trial' into accusations he was a homosexual.
After being found 'guilty', the man was sentenced to death for breaching what ISIS claims is a true interpretation of Shariah law.
The video, entitled 'The Authority of Sharia', is from the province of Al-Jazeera, in Northern Iraq near the jihadists' stronghold city of Mosul.
The man is accused of "corruption of thought" and "homosexual acts" before being thrown from the high-rise building.
Onlookers gathering to watch the brutal punishment include masked jihadists as well as young children.
In the Islamic State's twisted interpretation of Shariah law, it is customary for homosexuals to be thrown from the top of the tallest building in the town.