Cherberg Building on the capitol campus in Olympia, Washington offer nursing moms a space to express breast milk located in the Quiet rooms on south side, off women's restroom vestibule near elevators. This is not a dedicated lactation room, but it does serve well for a private spot to breastfeed or breastpump.
There's no sink, but amenities include:
Couch, chairs, blanket, window blinds for privacy and an interior lock.
No special directions for access to the room.