(1) In general. The term purchaser means a person who, for adequate and full consideration in money or money's worth (as defined in paragraph (f)(3) of this section), acquires an interest (other than a lien or security interest) in property which is valid under local law against subsequent purchasers without actual notice.
(2) Interest in property. For purposes of paragraph (f) of this section, each of the following interests is treated as an interest in property, if it is not a lien or security interest:
(i) A lease of property,
(ii) A written executory contract to purchase or lease property,
(iii) An option to purchase or lease property and any interest therein, or
(iv) An option to renew or extend a lease of property.
(3) Adequate and full consideration in money or money's worth. For purposes of paragraph (f) of this section, the term “adequate and full consideration in money or money's worth” means a consideration in money or money's worth having a reasonable relationship to the true value of the interest in property acquired. See paragraph (a)(3) of this section for definition of the term “money or money's worth.” Adequate and full consideration in money or money's worth may include the consideration in a bona fide bargain purchase. The term also includes the consideration in a transaction in which the purchaser has not completed performance of an obligation, such as the consideration in an installment purchase contract where the purchaser has not completed the installment payments.
(g) Judgment lien creditor. The term judgment lien creditor means a person who has obtained a valid judgment, in a court of record and of competent jurisdiction, for the recovery of specifically designated property or for a certain sum of money. In the case of a judgment for the recovery of a certain sum of money, a judgment lien creditor is a person who has perfected a lien under the judgment on the property involved. A judgment lien is not perfected until the identity of the lienor, the property subject to the lien, and the amount of the lien are established. Accordingly, a judgment lien does not include an attachment or garnishment lien until the lien has ripened into judgment, even though under local law the lien of the judgment relates back to an earlier date. If recording or docketing is necessary under local law before a judgment becomes effective against third parties acquiring liens on real property, a judgment lien under such local law is not perfected with respect to real property until the time of such recordation or docketing. If, under local law, levy or seizure is necessary before a judgment lien becomes effective against third parties acquiring liens on personal property, then a judgment lien under such local law is not perfected until levy or seizure of the personal property involved. The term “judgment” does not include the determination of a quasi-judicial body or of an individual acting in a quasi-judicial capacity such as the action of State taxing authorities.