(a) In this chapter, "authorized real estate security" means:
(1) a proprietary lease and a stock membership certificate issued to a tenant stockholder or resident member of a fee simple cooperative housing corporation as defined in Section 216, Internal Revenue Code of 1986; or
(2) a mortgage, deed of trust, wraparound mortgage, or other instrument that constitutes a first lien or charge on real estate or is considered to be the equivalent of a first lien or charge on real estate by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, the Federal Housing Finance Board, a successor of one of those entities, an agency of this state, or a federal agency, provided:
(A) the improvement on the real estate is a building or buildings designed to be occupied as specified by Section 3502.003(1); and
(B) the real estate loan is a type of loan that is:
(i) authorized to be made by a bank, savings and loan association, credit union, or insurer that is supervised and regulated by a department of this state or a federal agency;
(ii) authorized to be made by a mortgage banker that is an approved seller-servicer of the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, or a successor of one of those entities; or
(iii) approved by the federal secretary of housing and urban development for participation in a mortgage insurance program.
(b) The lien on real estate described by Subsection (a)(2) may be subject and subordinate to:
(1) the lien of a public bond, assessment, or tax if there is not a delinquent installment, call, or payment of or under the bond, assessment, or tax;
(2) an outstanding mineral, oil, or timber right, right-of-way, easement or right-of-way support, sewer right, building restriction, other restriction or covenant, or other condition or regulation of use; or
(3) an outstanding lease on the real estate under which rents or profits are reserved to the owner.