PUBLIC LAW 101-550 —NOV. 15, 1990 104 STAT. 2725 "(B) such other indenture is a collateral trust indenture under which the only collateral consists of indenture securities, or "(C) such obligor has no substantial unmortgaged assets and is engaged primarily in the business of owning, or of owning and developing and/or operating, real estate, and the indenture to be qualified and such other indenture are secured by wholly separate and distinct parcels of real estate: Provided, That the indenture to be qualified shall automatically be deemed (unless it is expressly provided therein that such provision is excluded) to contain a provision excluding from the operation of this paragraph other series under such indenture, and any other indenture or indentures under which other securities, or certificates of interest or participation in other securities, of such an obligor are outstanding, if— "(i) the indenture to be qualified and any such other indenture or indentures (and all series of securities issuable thereunder) are wholly unsecured and rank equally, and such other indenture or indentures (and such series) are specifically described in the indenture to be qualified or are thereafter qualified under this title, unless the Commission shall have found and declared by order pursuant to subsection (b) of section 305 or subsection (c) of section 307 that differences exist between the provisions of the indenture (or such series) to be qualified and the provisions of such other indenture or indentures (or such series) which are so likely to involve a material conflict of interest as to make it necessary in the public interest or for the protection of investors to disqualify such trustee from acting as such under one of such indentures, or "(ii) the issuer shall have sustained the burden of proving, on application to the Commission and after opportunity for hearing thereon, that trusteeship under the indenture to be qualified and such other indenture or under more than one outstanding series under a single indenture is not so likely to involve a material conflict of interest as to make it necessary in the public interest or for the protection of investors to disqualify such trustee from acting as such under one of such indentures or with respect to such series; "(2) such trustee or any of its directors or executive officers is an underwriter for an obligor upon the indenture securities; "(3) such trustee directly or indirectly controls or is directly or indirectly controlled by or is under direct or indirect common control with an underwriter for an obligor upon the indenture securities; "(4) such trustee or any of its directors or executive officers is a director, officer, partner, employee, appointee, or representative of an obligor upon the indenture securities, or of an underwriter (other than the trustee itself) for such an obligor who is currently engaged in the business of underwriting, except that— "(A) one individual may be a director and/or an executive officer of the trustee and a director and/or an executive officer of such obligor, but may not be at the same time an executive officer of both the trustee and of such obligor,
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