If Sub-Subtenant timely and validly exercises the Expansion Option, then, beginning on the Expansion Space Delivery Date and continuing for the balance of the Term, the Expansion Space shall be part of the Premises under this Sub-Sublease (so that the term “Premises” in this Sub-Sublease shall refer to the space in the original Premises, as originally described in this Sub-Sublease, plus the Expansion Space). Sub-Subtenant’s lease of the Expansion Space shall be on the same terms and conditions as affect the original Premises. Sub-Subtenant’s obligation to pay Rent with respect to the Expansion Space shall begin on the Expansion Space Delivery Date.