CLEAN : Grim wait for word of loved ones after fatal fire

The transcript describes a tragic event in Oakland, where a building's roof collapsed, leading to a mass casualty situation. First responders are dealing with the aftermath, and the number of fatalities is expected to rise. The building was usually empty, and it's unclear how people got inside. The area is known for artist hangouts, adding to the complexity of the situation.

What does the speaker imply about the building's usual occupancy?

What is the speaker's concern regarding how individuals accessed the building?