I am guessing you would provide the account login and password to the escrow person/service?
The escrow person can then verify the login and then send the password to the buyer, who would then make any necessary changes to the account recovery options?
I have someone interested in an account I am selling but requesting that I provide the password to them directly, presumably after the BTC is in escrow.
I'm a bit unsure of that if a dispute arises, how I would make my case that I did in fact provide the correct password.