There are three entrances to the office, the ones on the right-hand side and the middle of the building have a flight of stairs leading up to them, and the entrance on the left does not.
You can access the office from the other doors, but it is very difficult to navigate.
The easiest access point is using the left-hand door (No flight of stairs). Once you enter that door, Thrive By Design is the first door on the right.
Should you have gone in the middle (Main) entrance, take the elevator down to the lower level. Exit the elevator and walk until you see a cargo elevator. Once you see that, turn left and head all the way down the hall. The office will be the last door on the left across from the bathrooms.