In the first CCTV video, a girl is shown landing on the pavement after an apparent fall from the building. In the second, a guy puts her corpse into an elevator and appears to take it upstairs.
From the looks of the timeline on the corners of the cams it looks like it happened in this order. What exactly went down, can’t be discerned from the vids.
Thanks a lot to Best Gore member @carnage-2 for the videos: