3. Security Interests in Fixtures. Certain goods that are the subject of personal-property (chattel) financing become so affixed or otherwise so related to real property that they become part of the real property. These goods are called "fixtures." See Section 9-102 [Maine cite section 9-1102] (definition of "fixtures"). Some fixtures retain their personal-property nature: a security interest under this Article may be created in fixtures and may continue in goods that become fixtures. See subsection (a) [Maine cite subsection (1)]. However, if the goods are ordinary building materials incorporated into an improvement on land, no security interest in them exists. Rather, the priority of claims to the building materials are determined by the law governing claims to real property. (Of course, the fact that no security interest exists in ordinary building materials incorporated into an improvement on land does not prejudice any rights the secured party may have against the debtor or any other person who violated the secured party's rights by wrongfully incorporating the goods into real property.)

Thus, this section recognizes three categories of goods: (1) those that retain their chattel character entirely and are not part of the real property; (2) ordinary building materials that have become an integral part of the real property and cannot retain their chattel character for purposes of finance; and (3) an intermediate class that has become real property for certain purposes, but as to which chattel financing may be preserved.

To achieve priority under certain provisions of this section, a security interest must be perfected by making a "fixture filing" (defined in Section 9-102 [Maine cite section 9-1102]) in the real-property records. Because the question whether goods have become fixtures often is a difficult one under applicable real-property law, a secured party may make a fixture filing as a precaution. Courts should not infer from a fixture filing that the secured party concedes that the goods are or will become fixtures.

4. Priority in Fixtures: General. In considering priority problems under this section, one must first determine whether real-property claimants per se have an interest in the crops or fixtures as part of real property. If not, it is immaterial, so