I didn’t get a notification when you followed up so sorry for the late reply. For me, I would propose 5% inclusive of MEP, FP, and Structural or 3.75% for architecture only. The beauty of this is that in my experience the engineering will run 30% to 33% of the overall fee. So… give up 25% to save 33% and the client thinks they’re saving money.
And yes, that’s a $1 million fee. Just be worth it.