The coroner's office will conduct an autopsy to determine the official cause of death. It is not releasing the man's identity until his relatives are notified.
Bentovoja said the man did not appear to work for the building.
Formally named the 1201 K Tower, the building houses offices for lobbyists, public relations businesses and law firms that do business two blocks away at the Capitol.
The man's death comes less than three weeks after police say a 22-year-old convicted graffiti tagger fell to his death while spray-painting a freeway bridge in Sacramento. Gigante said the deaths were unrelated.