A fire that started in a Manhattan apartment building under construction turned into a five-alarm blaze this morning. No injuries have been reported yet, and now the Fire Department is reportedly concerned the structure will collapse.

The fire was reported around 3 a.m. at 221 West 17th Street in Chelsea. It quickly grew to five alarms, as it spread to the 4th, 5th, 6th floors and roof.

The building is vacant, and the Fire Department evacuated neighboring buildings. One resident told CBS New York, "We woke up and smelled smoke. Always upsetting when you see firemen in your hallway. It’s never a good sign," while another said, "They want everyone out of the building. In case it comes down, you’d be sort of trapped inside."

The fire was under control by 6 a.m.

The site is to be the location of The Dorian, a 14-unit residential condo; the Real Deal reported in May that it would include "full-floor penthouse units on the seventh through 10th floors and two units on each of the second through sixth floors... with lower-floor residences starting at around $3 million and the building’s top-floor 3,000-square-foot penthouse, which features three bedrooms and private roof access, asking between $9 million and $10 million."

NBC New York reports the building's sprinklers were in limbo: