Police say they were called to the building on Balsam Street near West 41st Avenue at around 6:30 a.m. PT after a report of an altercation.
Officers found the victim in the lobby, suffering serious injuries from stab wounds. He was rushed to hospital but subsequently died.
The suspect and victim, neither of whom have been named, were known to each other, say police. However, the suspect is yet to be apprehended.
Google Map: Balsam Street near West 41st Avenue