code:

Sec. 544. Trustee as lien creditor and as successor to certain
      creditors and purchasers

(a) The trustee shall have, as of the commencement of the case,
    and without regard to any knowledge of the trustee or of any
    creditor, the rights and powers of, or may avoid any transfer of
    property of the debtor or any obligation incurred by the debtor
    that is voidable by - 
        (1) a creditor that extends credit to the debtor at the time of
      the commencement of the case, and that obtains, at such time and
      with respect to such credit, a judicial lien on all property on
      which a creditor on a simple contract could have obtained such a
      judicial lien, whether or not such a creditor exists;
        (2) a creditor that extends credit to the debtor at the time of
      the commencement of the case, and obtains, at such time and with
      respect to such credit, an execution against the debtor that is
      returned unsatisfied at such time, whether or not such a creditor
      exists; or
        (3) a bona fide purchaser of real property, other than
      fixtures, from the debtor, against whom applicable law permits
      such transfer to be perfected, that obtains the status of a bona
      fide purchaser and has perfected such transfer at the time of the
      commencement of the case, whether or not such a purchaser exists.