PET scan tomorrow

So I have a PET scan scheduled tomorrow morning at Hillcrest downtown. I have all the instructions as to what I'm to wear, not eat, etc., but no idea WHERE I'm supposed to go to check in. I've called, and apparently, anyone who answers the phone there has no clue where anything is!

Can anyone hear please tell me where I'm supposed to check in tomorrow morning, as no one who is actually there seems to know! Thanks in advance.