Operation of Building. The Building is or may in the future become certified under any one or more Green Rating Systems or operated pursuant to Landlord’s sustainable building practices. Landlord’s sustainability practices address whole-building operations and maintenance issues, including, but not limited to, chemical use, indoor air quality, energy efficiency, water efficiency, recycling programs, transportation management programs, exterior maintenance programs, and systems upgrades to meet green building energy, water, indoor air quality, and lighting performance standards. All construction and maintenance methods and procedures, material purchases, and disposal of waste must be in compliance with minimum standards and specifications provided to Tenant, in addition to all Applicable Laws.

Operation of Properties. Except as provided in [Section 4.19 and 4.20]0] below and only to the extent Borrower is an “operator” of any Oil and Gas Properties, Borrower will operate, or use reasonable efforts to cause to be operated, all Oil and Gas Properties in a careful and efficient manner in accordance with the practice of the industry and in compliance in all material respects with all applicable laws, rules, and regulations, and in compliance in all material respects with all applicable proration and conservation laws of the jurisdiction in which the properties are situated, and all applicable laws, rules, and regulations, of every other agency and authority from time to time constituted to regulate the development and operation of the properties and the production and sale of hydrocarbons and other minerals therefrom; provided, however, that Borrower shall have the right to contest in good faith by appropriate proceedings, the applicability or lawfulness of any such law, rule or regulation and pending such contest may defer compliance therewith, as long as such deferment shall not subject the properties or any part thereof to foreclosure or loss.

Operation. If Tenant shall abandon, vacate or surrender the Leased Premises, or be dispossessed by process of law, or otherwise, any Personal Property belonging to Tenant and remaining on the Leased Premises after such event shall, at the option of Landlord, be deemed abandoned. Tenant shall be required to follow the reasonable recommendations of Landlord and/or Landlord’s LEED consultants to insure that the operation of Tenant’s business at the Leased Premises will satisfy the LEED requirements applicable for the Building.

Operation of Property. From the Effective Date through and including the Closing Date, Seller agrees to operate and maintain the Property in the normal course of business substantially in accordance with practices employed with respect to the Property as of the Effective Date, normal wear and tear excepted.

Operation. The personal property, wells, structures, and equipment of the Seller are sold in “as is” condition and after the Closing shall be in substantially the same manner as conducted prior to the Closing.

Operation of Properties. Except as provided in [Section 4.19 and 4.20]0] below and only to the extent Borrower is an “operator” of any Oil and Gas Properties, Borrower will operate, or use reasonable efforts to cause to be operated, all Oil and Gas Properties in a careful and efficient manner in accordance with the practice of the industry and in compliance in all material respects with all applicable laws, rules, and regulations, and in compliance in all material respects with all applicable proration and conservation laws of the jurisdiction in which the properties are situated, and all applicable laws, rules, and regulations, of every other agency and authority from time to time constituted to regulate the development and operation of the properties and the production and sale of hydrocarbons and other minerals therefrom; provided, however, that Borrower shall have the right to contest in good faith by appropriate proceedings, the applicability or lawfulness of any such law, rule or regulation and pending such contest may defer compliance therewith, as long as such deferment shall not subject the properties or any part thereof to foreclosure or loss.

Operation. Operate and maintain the Assets in accordance with this Agreement and (except to the extent this Agreement requires otherwise) in accordance with Seller’s past practices with respect to the Assets in all material respects.

Operation. Operate and maintain such Seller’s Property, and perform all maintenance and repair, in a businesslike manner and materially in accordance with such Seller’s past practices with respect to such Seller’s Property, but subject to normal wear and tear.

Operation of Properties. Seller will cause the Properties to be operated in the ordinary course of business consistent with its prior practice and pursuant to the terms of the Leases.

Operation and Maintenance of Properties. Each Borrower, at its own expense, except where the failure to do so would not reasonably be expected to have a Material Adverse Effect, will and will cause each Restricted Subsidiary to: