A fire broke out in an apartment under construction at the Trump International Hotel and Tower early Friday on Columbus Circle, according to reports.

The blaze started at around 4:12 a.m. on the 47th floor of the 52-story building at 1 Central Park West.

The fire was sparked when a piece of machinery malfunctioned in the apartment, authorities told WCBS.

The blaze, which forced a partial evacuation of the building, was brought under control at about 5:20 a.m., CBS reported. The upper floors were vented because of carbon-monoxide concerns.

One person was treated for smoke inhalation.

A guest staying at the tower told The Post that she was startled to hear the emergency alarm go off Friday morning.

“There were like 15 fire trucks and four other emergency vehicles. Our room did smell a little like smoke,” said Mimi Borowich, 34, a librarian visiting from Fort Lauderdale, Fla. “We were not asked to leave. It was very unusual. We were concerned.”

The 166-apartment condo tower, which was built in 1996, features hotel-style service, health club, pool, sauna and steam room, among other amenities, according to Trump International Realty.