#6: Your single-user restroom is probably underused
If you have a single-user restroom, how is it labelled? If, as is often the case, it’s specially designated for a certain group ('family restroom', 'handicapped only,' etc.) consider if it would cause problems for you to open up this restroom to everyone. It's not only one fewer door for anyone who struggles with door handles to have to deal with, it also may make the difference between whether a trans or gender nonconforming person feels comfortable using the library or not.