UPDATE: Cause was a lit candle.
The Boston Fire Department reports a one-room fire Saturday night at 722 Commonwealth Ave. sent one BU student to the hospital and did an estimated $200,000 in damage.
The student suffered non-life threatening injuries, the department says.
Some 40 students had to be relocated for the night due to water damage from putting out the third-floor fire, to which the department responded around 10 p.m.
The cause remains under investigation, the department says.