New York Police Department (NYPD) officers guard the main entrance of the Trump Tower, where US President-elect Donald Trump holds meetings, in New York on November 14, 2016. Jewel Samad | AFP | Getty Images

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. More from NBC News:

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Obama: Trump 'Thought It Was OK to Lie' About N.C. Rally Incident "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."



Pedestrians walk by new police security posts outside of Trump Tower that have been installed since Donald Trump became the president-elect on November 14, 2016 in New York City. Spencer Platt | Getty Images

Jonathan Wackrow, who was a Secret Service agent on three presidential details, said he has no doubt the agency and the NYPD can meet the challenge.

"Trump Tower will be secure. Period. That's not even a question," he said. "The bigger issue here is the impact that those security measures will have on the people of New York." Other presidents have used retreats — the compound in Kennebunkport, Maine, or the ranch in Crawford, Texas, for the Bushes — but they were in easily protected locations. Trump Tower, on the other hand, has hundreds of tenants in 263 apartments, according to its website. That's on top of 26 floors of offices and a five-story public atrium with stores ranging from Starbucks to Gucci. Trump has not left the building since Thursday, and SWAT teams, barricades and sand-filled trucks are already fixtures — along with protesters. The sky above it is a no-fly zone until the inauguration at least. "It's like living in the White House," said resident Rachel Adjmi Kaimowitz, who voted for Trump but isn't thrilled about all the new security in her building. "It's distracting, it's nerve-wracking, it's a big problem." Law enforcement agencies are meeting this week to discuss plans for securing the skyscraper going forward. Possible scenarios include closing lanes on Fifth Avenue, home to Tiffany's and other world-famous retailers, NBC New York reported.