The Midnight Treehouse, as Lex decided to call it so that it was easily distinguishable from the Midnight Tavern, was pretty big, so naturally the house part of the treehouse was big as well.
Despite there being a reception room right at the foot of the tree, from where new guests could enter, the rest of the treehouse was higher up. This design was purposefully selected by Lex, since he was on a 1 Star planet.
The locals here wouldn't be strong, and it might be inconvenient for most to reach the treehouse itself if the entrance weren't on the floor.
From the entrance there was a staircase that went around the trunk of the tree until it eventually reached the upper levels, but in case guests were not in the mood to climb hundreds of stairs, there was also a teleportation formation.