Excess Costs. Any costs of the [[Organization B:Organization]] Improvements which exceed the [[Organization B:Organization]] Improvement Allowance shall be the financial responsibility of [[Organization B:Organization]]. Any improvements to the Expansion Space, other than as shown on the [[Organization B:Organization]] Phase 1 Working Drawings and/or [[Organization B:Organization]] Phase 2 Working Drawings, and the furnishing of the Expansion Space, shall be made by [[Organization B:Organization]] at the sole cost and expense of [[Organization B:Organization]], subject to all other provisions of this Third Addendum and the Lease, including the cost of any improvements required to comply with applicable governmental laws, ordinances, and regulations. Any excess or unused portion of the [[Organization B:Organization]] Improvement Allowance shall be retained by the [[Organization A:Organization]].