What is the building behind the Trevi Fountain and why is there a painted window on the right hand side?

Answer 1

On a tour of Rome our guide told us that the building was the home of a wealthy Cardinal and his family. I can't remember their name right now. Soon after the fountain was built, the teenaged or twenty-something son, who was a partier (and perhaps disgrace to the family) was found dead at the foot of the fountain, below his bedroom window. His fingers were bent back and broken, and his fingernails were badly mangled, possibly showing signs of struggle. There was debate over whether it was murder or suicide. The pope, who was close to the family, declared it a suicide. After this, people started reporting seeing a ghost falling from the window, so it was covered over and painted to look like a window, to stop the discussion. Now it is a government building but still no one is ever allowed to go into that room.

this may or may not be true

Adding to that from what i was told a few days ago:

The man who lived in that room was homosexual, he was in love with someone called carlos, however, as he would be killed for these feelings he kept it very much to himself, until one night when he saw carlos one night in the arms of another man who he then stabbed to death with a pen, carlos, in shock, asked the man why he had killed the other, to which he confessed his love. Knowing that he would be killed for homosexual feelings, he was prepared to flee, but on deciding he could not live like that, he threw himself head first out of his window. Many reports from people living in surrounding apartments came around that a dark figure would fall from the window screaming, creating a kind of splash on hitting the floor, but when they looked there was nothing at the bottom. As people in Rome are incredibly superstitious they boarded up the window to attempt to stop the ghost coming back.

This is what i was told, cant remember all the names or every bit of detail but this is the majority of what was said.

I just like to add to this answer that the building name is: Palazzo Poli (Poli Palace).