Adel's letter is not an offer unless both Adel and Abdullah considered it as an offer.
Step-by-step explanation:
In the context given above is an offer if the letter is accepted by both the parties as an offer. Here Adel is writing a letter where he wants to sell his house $950000 payable upon merchant deed and this deal has to be completed within 60 days the day when it was accepted. In this letter he is also mentioning that he wants to sell the house to Abdullah. Hence this letter becomes a deal when both of them accept it from their parts.