Taxable mortgage pool defined
For purposes of this title—
(A) In general Except as otherwise provided in this paragraph, a taxable mortgage pool is any entity (other than a REMIC) if— (i) substantially all of the assets of such entity consists of debt obligations (or interests therein) and more than 50 percent of such debt obligations (or interests) consists of real estate mortgages (or interests therein), (ii) such entity is the obligor under debt obligations with 2 or more maturities, and (iii) under the terms of the debt obligations referred to in clause (ii) (or underlying arrangement), payments on such debt obligations bear a relationship to payments on the debt obligations (or interests) referred to in clause (i).
(B) Portion of entities treated as pools Any portion of an entity which meets the definition of subparagraph (A) shall be treated as a taxable mortgage pool.
(C) Exception for domestic building and loan Nothing in this subsection shall be construed to treat any domestic building and loan association (or portion thereof) as a taxable mortgage pool.
(D) Treatment of certain equity interests To the extent provided in regulations, equity interest of varying classes which correspond to maturity classes of debt shall be treated as debt for purposes of this subsection.