Fairmont Royal York as Meeting Hall
The two delegations return to the negotiating table to settle their deal and Chrisjen asks about Bobbie.
“Cascade” Filming Locations
The crew of the Roci searches Ganymede for signs of Prax's daughter while Bobbie escapes the confines of the Martian Embassy.
The Expanse episode “Cascade” was filmed in Toronto in Canada.
Science Wing (U of T Scarborough) as M.C.R. Embassy
Bobbie escapes the embassy through her window and slides down the outside of the building.
Lot under Lake Shore Boulevard at Spadina as Camp under Highway
Bobbie comes upon a homeless encampment under a road and tries to get directions to the ocean.
Marie Curtis Park as Shore
Bobby finds her way to the ocean where Chrisjen soon finds her and asks for her help.
Source: TiredWiredRuinsEasy—Reddit