auction house
US /ˈɑːk.ʃən ˌhaʊs/
UK /ˈɑːk.ʃən ˌhaʊs/

1.
a company or building where auctions are held
:
•
The rare painting was sold at a famous auction house.
•
She works for an international auction house specializing in antiques.
a company or building where auctions are held