(a) A loan the proceeds of which are used primarily to purchase an interest in a trust or other entity that has as its principal asset real property located outside the United States is:
(1) not subject to Subtitle B; and
(2) subject to the interest rate limitations of Chapter 303.
(b) For the purpose of determining the interest rate on a loan to which this section applies, all interest contracted for, charged, or received shall be amortized, prorated, allocated, and spread over the full stated term of the loan.
(c) This section does not affect application of a law of this state governing collateral that may be used to secure a loan to which this section applies.