Either (1) to deliver or cause to be delivered a copy of any such declaration, demand or notice to the lessors or lessees, for the time being (as the case may be).

Or (2) to send or cause to be sent a copy of any such declaration, demand or notice by registered mail, postage prepaid, properly addressed to the lessors or the lessees for the time being (as the case may be) at such address as the one party may have theretofore furnished to the other party in writing for the declared and express purpose of receiving notices; or if no such address shall have been theretofore furnished to such party for such purpose, then properly addressed to the party at such party's last known address.

All notices to or demands upon the lessors or lessees are hereby required to be in writing; and in any case the declaration, demand or notice, or copy thereof, may be signed and made, given or served, in person or by an agent, attorney or servant.

And in each and every case, such service in any of the modes above provided, of any declaration, demand or notice, shall be sufficient and held effectual for all purposes and no other or further declaration, demand or notice or method or manner of giving, serving or delivering the same, shall be required.

It is expressly agreed that if, at the time of making, giving or serving any declaration, demand or notice as aforesaid, the estate or interest of the lessees shall be encumbered by mortgage or deed of trust in the nature of a mortgage in accordance with the provisions of this lease, and the lessors shall have been notified in writing of the existence of such mortgage or deed of trust and of the address of such mortgagee or trustee, then a copy of such declaration, demand or notice shall also either (1) be delivered or caused to be delivered to such mortgagee or trustee, or some officer or employee of such mortgagee or trustee above the age of 21 years, or (2) be sent to such mortgagee or trustee by registered mail (postage prepaid) at the address given to the lessors as aforesaid; provided, however, that in no case shall any notice to any bondholder, note holder or other owner or holder, or any indebtedness or obligation secured by or claiming under any mortgage or deed of trust be under any circumstances required.