This Sixth Amendment may be executed in multiple counterparts, each of which shall constitute an original, with the same effect as if the signatures thereto were upon the same instrument. If any signature to this Sixth Amendment is delivered by facsimile transmission or by e-mail delivery of a portable document format (.pdf or similar format) data file, then such signature shall create a valid and binding obligation of the party executing (or on whose behalf such signature is executed) with the same force and effect as if such facsimile or “.pdf’ signature page were an original thereof. This Sixth Amendment shall become effective when both Sublandlord and Subtenant have received a counterpart hereof signed by the other.