@nomorehelosforme: I would guess no, or very little control. From what I see now, I would guess the term Heavy landing is correct. I'd say crash.
If in control I believe no one puts it down with lot of nose down attitude.
Nose down attitude, damages and signs of no/very low rotor rpm does'nt point towards a deliberate choise to land where it came down.
About the roof/ceiling and the separate events of bang and ceiling coming down: Could it be possible that the impact destroyed /cracked the concrete roof, but it did hold together for a short while by reinforcement ? Thinking about how reinforced concrete hold together, when you break the concrete and the weight of the concrete makes the roof come down a small bit, the tension in the reinforcement increases until it snaps ?