I started by drawing up the basic plan of the existing library, modeling the existing rooms and the glass curtain wall. From here, I toyed with various layout ideas before removing all of the walls. Then I started to plan rooms.
What should I upload in this Develop Solutions step?
Consider uploading images (JPG, GIF) of your rough digital model. It's ok if your model is still a work in progress. Show an axonometric or perspective view with people, which will help others understand the scale of your library.