1. Yes you are right that it means 'although', but the reason is because it is a 'subjunctive'(?) form of the verb 'to be'. You know that if you give a command, you say "Be quiet", but if you describe the person, you say "You are quiet". Or do you know the phrase "If I were...", which refers to a hypothetical situation, because usually you say "I was..." or "I am.. " or "I will be..." Or have you heard of when someone gives a blessing, "May you be happy..."? So the "be it" is like a soft way of saying "this is how it is". 2. The "ever" in this sentence is showing that it is sometime in the future, and may never happen. It means he is not thinking about selling the house at the moment. If the sentence was "If you decide to sell", it would definitely sound like he was already thinking about it and was trying to decide one way or the other. It is an important difference. 3. The listing refers to having that property on her list of available properties that she can show clients. It does not refer to any extra items. It is a real estate term that means she would get the right to sell the house, maybe exclusively (no other sales person can sell it) so that she can get the commission.