What is the ruling on my borrowing from an Islamic bank to construct a commercial building, where the bank purchases construction materials from a contracting company and transfers the amount directly to the company, then I receive the amount in cash from the company and repay the loan to the bank in monthly installments?

Since the bank did not take possession of the goods and did not authorize the person to take possession of them, this is sufficient to prohibit the transaction, which is a circumvention of explicit usurious loans, whether through organized Tawarruq or otherwise. Bank financing is permissible only if the conditions for permissible Tawarruq are met.