The shooting happened on the fourth floor of the high-rise building just after 4 p.m. The victim, described as an Asian male of unknown age, was shot multiple times.
One person was taken into custody. Police believe the suspect may have been a former office employee. There were no other victims in the shooting and police were not searching for other suspects.
The building houses several other businesses, and frightened workers fled out into the streets when they realized a shooting had occurred. One witness said they could hear three shots fired from the fifth floor.
The circumstances of the shooting are under investigation.