I am using EQS system which probes nav mesh locations then picks best teleport destination near location i am pointing with controller. But that may be quite advanced thing to do, not needed for arch viz.
Instead you could do some simple teleportation system, then add special actor to make more complicated teleport jumps. So noraml locomotion happens when you select teleport destination, but when you trace that actor you set some special location (for eg upstairs). This whole thing can be done with actor blueprint that when triggered calls event in player pawn or controller. And that event teleports it to destination given by actor.
Or you can do your room travel like in example from post, just place widgets in 3d that teleport you to another room.