The parking structure is at 330 E Union. So plug that address into your navigation. The office is the white building behind parking.
After entering the parking lot, pull up to the attendant and tell him you are going to SUITE 860. He will give you a parking ticket and tell you where to park. Bring the ticket with you to be validated and you will get an hour or more of free parking. If you have an evening or weekend appointment you will not be given a ticket.
Walk out of the parking structure toward Garfield (the same direction Union goes) to the entrance at the back of the building. Walk past the fountain and look left. If you get confused ask the parking attendant where the building entrance is.
Take the elevator to the 8th floor. You will see Suite 860 as you get off the elevator. As you enter the suite, to the right is a light panel. Push the light next to the name of your therapist. You will be met in the waiting room.