15-24-1102. Federal property held under contract of sale. When the property is held under a contract of sale or other agreement whereby upon payment the legal title is or may be acquired by the person, the real property shall be assessed and taxed as defined in Title 15, chapter 6, part 1, and 15-8-111 without deduction on account of the whole or any part of the purchase price or other sum due on the property remaining unpaid. The lien for the tax may not attach to, impair, or be enforced against any interest of the United States in the real property.