Old buildings have bugs. Usually several varieties.
My library is an old building. Thus, it has bugs. There's George, our very large spider. I have not yet met George, and I think I'd like to keep it that way. George has lots of little friends because I see their webs all over the place. George and his friends really need to find a new place of residence. However, lately, I've been noticing more and more crickets. I hear them chirping in the stairwell. I see them hopping around the bathroom. They are friendly little buggars and it always makes me think of The Cricket in Times Square.
My current apartment has spiders, ants, and house centipedes. Ants are okay. I don't mind ants. House centipedes, however, are one of the creepiest bugs I have ever encountered. They still give me the willies and it's been over a year of living with them. Thankfully, I have a cat who likes to play with them... until they are dead. I love her. :)
So, the conclusion I have reached is: if a building has to have bugs, I vote for ants and crickets.
And those are my very deep thoughts for the morning.