(a) Subject to the limitations of section ten of this article, an insurer may acquire, either directly, indirectly through limited partnership interests and general partnership interests not otherwise prohibited by subsection (d), section five of this article, joint ventures, stock of an investment subsidiary or membership interests in a limited liability company, trust certificates, or other similar instruments, obligations secured by mortgages on real estate situated within a domestic jurisdiction, but a mortgage loan which is secured by other than a first lien may not be acquired unless the insurer is the holder of the first lien. The obligations held by the insurer and any obligations with an equal lien priority may not, at the time of acquisition of the obligation, exceed:
(1) Ninety percent of the fair market value of the real estate, if the mortgage loan is secured by a purchase money mortgage or like security received by the insurer upon disposition of the real estate;