Student or Learner
"He was out the building." "He was into the building."
The first one looks good. The second one seems suspect. Could the second one be okay after all?
" "He was into the building."
You use into normally with verbs of movements (run, go, walk, jump etc...) to indicate movement from the outside to the inside of a building or an environment.
He ran into the living room
He jumped into the water.
Normally BE is never followed by into except as a phrasal verb and its meaning totally changes then.
He is in the office. She is in the kitchen and so on...
I hope it helps