Authorities are investigating the cause of a fire that broke out at a Manhattan apartment building that's historically been home to some of the city's wealthiest power brokers.

The blaze was reported around 3 p.m. Wednesday on the sixth floor of 740 Park Avenue on the Upper East Side. The fire was brought under control by 4:30 p.m.

Three people sustained minor injuries.

One of the damaged apartments belongs to Wall Street hedge fund manager J. Erza Merkin. His attorney told The New York Times that "the fire was a serious one."

The structure was built in 1929. Other famous residents who have lived there include David Koch and John D. Rockefeller Jr.

Jacqueline Kennedy Onassis lived there as a child.