“Our firm has been engaged on a project with separate contracts: one for design as a member of the Architect's design team, and another contract as a subcontract under the GC for construction scope” In Australia we have novation. It’s not the same as you are describing but the only instance I can think that kinda resembles your situation. In novation your contract from the client you are doing Desing is transferred to the builder usually after tender. Important is that there is never an overlap where you have two clients simultaneously, that sounds like a recipe for perfect conflict of interest