A Utah family was told last week that their massive cardboard castle violates the city's code enforcement. 

Jeremy Trentelman built the structure for his 3-year-old son and 2-year-old daughter in the front yard of their home in Ogden City, Utah.

Trentelman came home from work last week and found a letter on his door stating that he was in violation of a city code that prohibits junk, waste materials and abandoned vehicles from being kept on properties.

The letter stated that Trentelman had 15 days to remove the fort from his lawn or he would be forced to pay $125, with more fines and legal action possible.

Elisabeth Hasselbeck, Brian Kilmeade and Steve Doocy were inspired by the story, so they invited his entire family to New York City.

This morning on "Fox and Friends," the Trentelman family was surprised with a new cardboard castle built outside on the Fox Plaza. 

Hasselbeck climbed inside the nifty structure to play along with the little ones. 

"I have to say, I made myself at home here," she told the kids. 

Trentelman told Steve Doocy that the notice he got from the city was "frustrating."

"When we got it, I decided that we were going to keep it up for the full 14 days," he said. "It was just something for my kids to play with a little bit."

He added that the notice from the city came with a statement, which said that they would put a lien on his home if he didn't remove the cardboard from his yard.  

Trentelman told Doocy that the castle was destroyed by the bad weather in Utah.

Watch the full video above to hear more from the family on "Fox and Friends."