Notwithstanding the other provisions of paragraph (a)(2) of this section, if the loan or advance represents the proceeds of a loan obtained by the lender at the situs of the borrower, the arm’s length rate for any taxable year shall be equal to the rate actually paid by the lender increased by an amount which reflects the costs or deductions incurred by the lender in borrowing such amounts and making such loans, unless the taxpayer establishes a more appropriate rate under the standards set forth in paragraph (a)(2)(i) of this section ...