Trump Tower has long been a magnet for millionaires, a mecca for tourists, and a monument to one man's need to put his name on everything.
Now that its owner-occupant has been elected president, the 58-story glass tower smack-dab in the heart of Manhattan is something new: a headache for the Secret Service and the NYPD.
And with Donald Trump reportedly thinking about commuting between his Fifth Avenue penthouse and the White House, it could turn into a full-blown migraine.
"It's an unprecedented challenge," said William Bratton, who was New York City's police commissioner until two months ago.
"You are in one of the busiest cities in the world, on one of the busiest streets in the world, and one of the most well-known buildings in the world."