Wim L
It's really a wing of the market building that happens to extend above Western. 

Old photo from before the adjoining building was built: https://upload.wikimedia.org/wikipedia/commons/7/71/Pike_Place_Market_-_Joe_Desimone_Bridge_01.jpg

Newer photo (looking at it from the other side): https://historylink.tours/wp-content/uploads/2020/05/Joe-Desimone-Bridge-and-MarketFront-Pike-Place-Market-Seattle-2019.jpg