(a) A security interest under this chapter may be created in goods that are fixtures or may continue in goods that become fixtures. A security interest does not exist under this chapter in ordinary building materials incorporated into an improvement on land.

(b) This chapter does not prevent creation of an encumbrance upon fixtures under real property law.

(c) In cases not governed by (d) - (h) 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) Except as otherwise provided in (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;

(2) the interest of the encumbrancer or owner arises before the goods become fixtures; and

(3) the security interest is perfected by a fixture filing before the goods become fixtures or within 20 days after the goods become fixtures.

(e) A perfected security interest in fixtures has priority over a conflicting interest of an encumbrancer or owner of the real property if

(1) the debtor has an interest of record in the real property or is in possession of the real property and the security interest

(A) is perfected by a fixture filing before the interest of the encumbrancer or owner is of record; and

(B) has priority over any conflicting interest of a predecessor in title of the encumbrancer or owner;

(2) before the goods become fixtures, the security interest is perfected by a method permitted by this chapter and the fixtures are readily removable

(A) factory or office machines;

(B) equipment that is not primarily used or leased for use in the operation of the real property; or

(C) replacements of domestic appliances that are consumer goods;

(3) the conflicting interest is a lien on the real property obtained by legal or equitable proceedings after the security interest was perfected by a method permitted by this chapter; or

(4) the security interest is

(A) created in a manufactured home in a manufactured home transaction; and

(B) perfected under a statute described in AS 45.29.311(a)(2).

(f) A security interest in fixtures, whether or not perfected, has priority over a conflicting interest of an encumbrancer or owner of the real property if

(1) the encumbrancer or owner has, in an authenticated record, consented to the security interest or disclaimed an interest in the goods as fixtures; or

(2) the debtor has a right to remove the goods as against the encumbrancer or owner.

(g) The priority of the security interest under (f)(2) of this section continues for a reasonable time if the debtor's right to remove the goods as against the encumbrancer or owner terminates.

(h) A mortgage is a construction mortgage to the extent that it secures an obligation incurred for the construction of an improvement on land, including the acquisition cost of the land if a recorded mortgage so indicates. Except as otherwise provided in (e) and (f) of this section, a security interest in fixtures is subordinate to a construction mortgage if the mortgage is recorded before the goods become fixtures and the goods become fixtures before the completion of the construction. A mortgage has this priority to the same extent as a construction mortgage to the extent that it is given to refinance a construction mortgage.

(i) A perfected security interest in crops growing on real property 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.

(j) The provisions of (i) of this section prevail over an inconsistent statute unless that statute contains an exemption that refers specifically to this section.