Answer: 1st floor
Step-by-step explanation:
From the descriprion Tristan got in the elevator on the second floor (2nd). He went five floors down toward the Parking garage this meant at the end of the journey he was on the seventh (7th) floor of the building. He went back of six (6) More floors before existing the elevator this would put Tristan on first (1st) floor of the building.
