I need someone to develop my house and sell it, and any money earned beyond the bank's price is halal for him

The location is in Wadi Al-Dawasir Province The location is in Wadi Al-Dawasir Province Peace be upon you and God's mercy and blessings I have a raw structure house, with an early repayment amount of 700,000 that will be released I want a developer or anyone to complete the construction of the house, finish it fully turnkey, then we put it up for sale, and any amount exceeding the bank's price is completely halal for him. I will write a document, checks, and an order authorization for him; whoever wants can add 50,000 as a gift because he freed me from the bank