Continuity mistake: The red dog carrier containing the "blow-dried rat" dog appears out of nowhere shortly before the dragon seller appears with his own identical dog carrier.
Continuity mistake: Shortly after changing Max back into a human, the three kids stop to talk. As soon as they do, Alex's hands change position from by her side and touching a table to folded in front of her.
Answer: Honestly I've been confused too. Thought the ones going down went to Justin's bedroom or to the station. Then the ones out the door went maybe to an elevator to those stairs I guess. Then the one to the side went to the lair But the freezer also leads to the lair or a secret spot sometimes too.
I think the ones in the sub shop go right up to a hallway in front of the loft, then the ones in the lair go to the bedrooms upstairs. Now there's a way to get to the lair from the loft and I believe it would be past the kitchen down to the hallway where we don't really see except in like one episode. Now what confuses me the most is the lair because when Harper finds out you see Alex using magic to open it into the lair but in every other episode you open it and it's the lair.