(a) Security interest in fixtures under this article. A security interest under this article may be created in goods that are fixtures or may continue in goods that become fixtures. A security interest does not exist under this article in ordinary building materials incorporated into an improvement on land.
(b) Security interest in fixtures under real-property law. This article does not prevent creation of an encumbrance upon fixtures under real property law.
(c) General rule: subordination of security interest in fixtures. In cases not governed by subsections (d) through (h), inclusive, of this section, a security interest in fixtures is subordinate to a conflicting interest of an encumbrancer or owner of the related real property other than the debtor.
(d) Fixtures purchase-money priority. Except as otherwise provided in subsection (h) of this section, a perfected security interest in fixtures has priority over a conflicting interest of an encumbrancer or owner of the real property if the debtor has an interest of record in or is in possession of the real property and:
(1) The security interest is a purchase-money security interest;