any change in the location, of such office or agency. If at any time the Issuers shall fail to maintain any such required office or agency or shall fail to furnish the Trustee with the address thereof, such presentations, surrenders, notices and demands may be made or served at the office of the Trustee where its corporate trust business is principally administered in the United States, and the Issuers hereby appoint the Trustee as their agent to receive all presentations, surrenders, notices and demands.
The Issuers may also from time to time designate different or additional offices or agencies to be maintained for such purposes (in or outside of such Place of Payment), and may from time to time rescind any such designation; provided, however, that no such designation or rescission shall in any manner relieve the Issuers of their obligations described in the preceding paragraph. The Issuers will give prompt written notice to the Trustee of any such additional designation or rescission of designation and any change in the location of any such different or additional office or agency.
Section 4.03Appointment to Fill a Vacancy in the Office of Trustee.
The Issuers, whenever necessary to avoid or fill a vacancy in the office of Trustee, will appoint, in the manner provided in Section 7.08, a Trustee, so that there shall at all times be a Trustee hereunder with respect to each series of Debt Securities.
Section 4.04Duties of Paying Agents, etc.
(a) The Issuers shall cause each paying agent, if any, other than the Trustee, to execute and deliver to the Trustee an instrument in which such agent shall agree with the Trustee, subject to the provisions of this Section 4.04,
(i) that it will hold all sums held by it as such agent for the payment of the principal of, and premium, if any, or interest on, the Debt Securities of any series (whether such sums have been paid to it by the Issuers or by any other obligor on the Debt Securities of such series) in trust for the benefit of the Holders of the Debt Securities of such series;
(ii) that it will give the Trustee notice of any failure by the Issuers (or by any other obligor on the Debt Securities of such series) to make any payment of the principal of, and premium, if any, or interest on, the Debt Securities of such series when the same shall be due and payable; and
(iii) that it will at any time during the continuance of an Event of Default, upon the written request of the Trustee, forthwith pay to the Trustee all sums so held by it as such agent.
(b) If either of the Issuers or any of the Subsidiaries of Holly Energy Partners act as paying agent, it will, on or before each due date of the principal of, and premium, if any, or interest on, the Debt Securities of any series, set aside, segregate and hold in trust for the benefit of the Holders of the Debt Securities of such series a sum sufficient to pay such principal, premium, if any, or interest so becoming due. The Issuers will promptly notify the Trustee of any failure by the Issuers or the Subsidiaries of Holly Energy Partners, as applicable, to take such action or the failure by any other obligor on such Debt Securities to make any payment of the principal of, and premium, if any, or interest on, such Debt Securities when the same shall be due and payable.
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