I should know better than to attempt to function on a Saturday morning. I now remember.
You can get to that office at least two ways. You can link to it from the Relto using a page in the thick brown book. You can also link to it with the book hidden in the aquarium in the ofice above the controls in Teledahn. (After the bucket ride in URU.) The page in the brown book may not be there yet if you haven't met certain 'order' requirements, but the aquarium is absolutely available.