Take it up with Oswald. He confirmed he was in the building "at the time."
~Grin~
The enclosed front entranceway was part of the building. As you have recently learned yourself (!), it was not "out on the street". Hence Mr. Oswald was not out on the street at the time, nor anywhere else at the time--------------no, he was in the building, which was the building where he worked.
How it must kill you that the reporter didn't ask Mr. Oswald, "Were you in
side the building at the time?"
Actually I wish he had asked that too, as it would have saved us all a lot of time. Thankfully, however, we found out in 2019 that Mr. Oswald told Captain Fritz where he was at the time:

Now! Let's try again, shall we?
I, Richard Smith, can explain how Reddish Shirt Man in Hughes is Billy Lovelady. The explanation is as follows:............................................ 