It’s awesome, but you can’t go in there to get books! It’s the Regional Service Center, the place where the happy library worker bees fill interlibrary request orders, decide how to shuffle books around to best meet the holds that have been placed at the various regional libraries, and that label and distribute the new books coming into the library system. If you happen to wander in there by mistake, they will be friendly and helpful but they still won’t let you have any books. :-) They will direct you to the Issaquah branch library about a mile away and that’s not too terrible an inconvenience really.