The Cost for Protecting Jet-Setting President-Elect Trump? Yuge! by WILLIAM M. ARKIN, CYNTHIA MCFADDEN, KEN DILANIAN and CORKY SIEMASZKO

When the soon-to-be first family sits down in Florida for their Thanksgiving feast, they will be watched over by the core part of their new extended family — a contingent of at least 150 Secret Service personnel.

And when Donald Trump gets sworn in as president on Jan. 20, that contingent will balloon to more than 920 Secret Service agents and support personnel in Washington and his hometown of New York City.

The price tag for all that security is already very big, or as the Manhattan mogul might put it, “Yuge,” internal Homeland Security and Secret Service documents reviewed by NBC News show.

Right now the cost to taxpayers is more than $2 million daily, the documents show, a number that is sure to increase whenever the president or first lady travel — or when the threat level rises.

Meanwhile, the New York Police Department is already handling external security at Trump Tower, the Manhattan home base of the president-elect, at an estimated cost of $1 million per day.

“You put a price tag on anything around the president, then you’re putting a price tag on his life and that is priceless,” Jonathan Wackrow, a former Secret Service agent who has protected every living president, including President Barack Obama, told NBC News in an exclusive interview.

Protecting Trump’s family presents unprecedented challenges. First off, it’s a big family — 18 members in all — including Melania Trump and her 10-year-old son Barron, as well as four adult children, three of them married, with a combined eight grandchildren.

The Secret Service has not had to protect the adult children of “a president-elect in a long time,” Wackrow said.

Also complicating security arrangements is Melania Trump’s decision to stay in Manhattan until Barron is done with school in June. Trump has told his team that he intends to make regular weekend trips back home to Trump Tower until Melania moves into the White House.

So millions of dollars worth of infrastructure will have to be installed in Trump Tower to turn it into a White House North.

“You have to be able to conduct a global war from the front porch, that is just the reality of the situation,” said Terry Sullivan of the White House Transition Project, a non-partisan organization that helps prepare the staffs of incoming presidents for the rigors of working in the White House.

When Trump heads home to the luxury 58-story high rise on Fifth Avenue, the feds will also need to find accommodations for staffers in a building where a modest one-bedroom, one-bathroom apartment rents for $5,250-a-month, according to the StreetEasy real estate site.

“They would need at least a whole floor, and every apartment on that floor would need to be turned into an office,” said Sullivan.

New York City Mayor Bill de Blasio is so concerned about the city getting stuck with the bill for protecting Trump that he’s already been in touch with outgoing Homeland Security chief Jeh Johnson as well as the President-elect’s transition team to ensure that the feds guarantee reimbursement.