Teleport to the interior of the building

Hi, this may be a stupid question, but I’m new. I need to do so that from the entrance to the building there was a teleport to the interior of the building, the question is, where to make this interior, in a separate level (Level) and make a teleport to it, or make this interior in the same level (Level), but somewhere under the map and also make a teleport to it.

There is no definite right answer to this question. Both solutions can be ok. Personally I would build it as it is in reality. So have the interior in the correct spot in case someone changes their mind and they now want to actually walk into the building. Good idea to have sub levels for the interior so you can stream them in during teleport if you have to for performance reasons.