There are technical standards that need to be met before a room or building can be designated as a SCIF. Multiple locks may be required, for example, and access to the room is restricted to people with specific security clearances.
How did Biden obtain his paper work?.
As VP Biden was not entitles to possess classified documents, so clearly Obama gave them to Biden.
But for what reason?
As president, he apparently takes what he wants (after consulting w/ Hunter, of course).