A. Nothing in this article shall be construed to prevent or limit the right of a trustor to transfer his interest in the trust property, or authorize a beneficiary or trustee to arbitrarily withhold his consent to a transfer by the trustor of his interest in the trust property.
B. When a trustor transfers his interest in the trust property, no beneficiary or trustee shall charge a fee on the transfer of more than one hundred dollars or one per cent of the balance due on the obligation secured by the trust deed, whichever is greater.
C. When a trustor transfers his interest in the trust property, no beneficiary or trustee shall increase the interest rate on the obligation secured by such trust deed unless the transferring trustor is released from all liability thereon and in no event shall the amount of such increase exceed one-half of one percent per annum more than the interest rate paid by the transferring trustor.
D. This section shall be applicable only to trust property of two and one-half acres or less which is not used for commercial purposes and which is limited to and utilized for dwelling units, not to exceed four single-family units.