Looking at the walkthrough, it appears that you need a 16-digit code in order to enter the tower and go up the elevator. It would appear that there are four actions you need to have performed in order to get this Council Code.
1. (Crane) Speak to Clarity about what happened. Main Street: Use your gospel on Leopold. Talk to Memento Morobuilt; ask for the Council Code twice. Factor: Give the head to Factotum.
It's actually kind of hard to tell from reading the walkthrough the sequence of events here in order to get the tower door code, but I believe this is correct. Maybe I'm missing something (it's quite possible), but I am not seeing anything in the walkthrough pertaining to Crispin and his red line/lien "poem."
If none of the above helps, please let us know. I hope I'm not just adding to the confusion.