Eleventh Amendment to Office Lease

EXHIBIT 10.1

Eleventh Amendment to Office Lease

This Eleventh Amendment to Office Lease (this “Eleventh Amendment”) is made and entered into by and between ASP, Inc., the managing partner of Boulder Tower Tenants in Common (“Landlord”), and HELMERICH & PAYNE, INC., a Delaware corporation (the “Tenant”), effective on and as of the date on which Tenant executes this Eleventh Amendment, as set forth on the signature page (the “Effective Date”).

WITNESSETH

WHEREAS, Landlord and Tenant previously entered into that certain Office Lease dated May 30, 2003, as amended by that certain First Amendment to the Lease dated as of May 23, 2008, Second Amendment to Lease dated December 13, 2011, Third Amendment to Office Lease (with form of Fourth Amendment to Office Lease attached thereto as Exhibit “B”) dated September 5, 2012, Fifth Amendment to Office Lease dated December 26, 2012, Sixth Amendment to Office Lease dated April 24, 2013, Seventh Amendment to Office Lease dated September 16, 2013, Eighth Amendment to Lease dated March 24, 2014, Ninth Amendment to Lease dated June 16, 2014, and Tenth Amendment to Lease dated November 26, 2014 (collectively, the “Lease”); pursuant to which Landlord leases to Tenant certain premises totaling 205,102 rentable square feet in the building commonly known as Boulder Towers (the “Building”), located at 1437 South Boulder, Tulsa, Oklahoma 74119 (the “Existing Premises”); and

WHEREAS, Landlord and Tenant desire to expand the Premises, and amend certain other terms of the Lease, all as more particularly provided below;

NOW, THEREFORE, pursuant to the foregoing, and in consideration of the mutual covenants and agreements contained in the Lease and herein, the Lease is hereby modified and amended as set out below:

1.                                      Definitions. All capitalized terms used herein shall have the same meaning as defined in the Lease, unless otherwise defined in this Eleventh Amendment.

2.                                      Expansion Space; Term Rent. Landlord and Tenant hereby confirm, stipulate and agree that the Existing Premises shall be expanded as of the term commencement date to include an additional 9,411 rentable square feet of office space known as Suite 670, which space is more particularly identified in red outline on Exhibit “A” attached hereto (the “Expansion Space”). Landlord will deliver possession of the Expansion Space on July 1, 2015 for commencement of the construction of Tenant Improvements. Landlord will diligently pursue completion of construction of the Tenant Improvements following delivery of possession. The term commencement date (“TCD”) with respect to the Expansion Space will be July 1, 2015; provided, however, in the event delivery of possession is delayed or Substantial Completion of Tenant Improvements does not occur by September 1, 2015 and any such delay is caused by Landlord or Landlord’s contractors, then Tenant shall be entitled to receive from Landlord a rent credit equal to one (1) day of free Annual Rent for every one (1) day of any such delay. Unless sooner terminated as provided in the Lease, and subject to the renewal options contained in the Lease, the expiration date for the lease of the Expansion Space will be January 31, 2025. Annual Rental for the Expansion Space payable by Tenant under the Lease shall be as follows:

With the Expansion Space, the total rentable square feet of the Leased Premises is 214.513 rentable square feet and the total rentable area of the Building is 521, 802 rentable square feet. In the event the parties execute the form of Fourth Amendment to Lease previously agreed to, the parties agree to modify that form prior to execution thereof in order to accurately reflect (after giving effect to this Eleventh Amendment) the total rentable square feet of the Leased Premises, total parking spaces, and Tenant’s Share of Operating Expenses.

3.                                      Tenant Improvement Allowance. The Landlord shall provide Tenant a $10.00 per rentable square foot Tenant Improvement Allowance totaling $94,110.00 to reduce the cost of Tenant Improvements to be constructed in the Expansion Space (in the same manner as set forth in Exhibit B of the Lease), inclusive of demolition, above ceiling modification, preliminary space planning and construction documents and construction. Landlord shall timely pay the cost of Tenant Improvements up to the amount of the Tenant Improvement Allowance. In the event that the total cost of Tenant Improvements is less than the Tenant Improvement Allowance, then the balance may, at Tenant’s election, be used by Tenant to improve any area of the Leased Premises as long as the improvements are completed within two (2) years from the TCD. In the event that the total cost of Tenant Improvements is more than the Tenant Improvement Allowance, then Tenant shall pay such excess costs when such amounts become due and owing to the contractors.

4.                                      Parking. With respect to the Expansion Space, the Landlord shall provide Tenant on the TCD twenty-eight (28) parking spaces, including five (5) reserved covered spaces in the attached parking structure and twenty-three (23) on a non-reserved basis on the existing surface lots. As of the TCD, Tenant shall have a total of five hundred seventy-eight (578) parking spaces, which shall consist of one hundred thirty-three (133) reserved covered spaces in the attached parking structure and four hundred forty-five (445) on a non-reserved basis on the existing surface lots. These spaces are free of charge.

5.                                      Tenant’s Share and Operating Expense Base. Tenant’s Share attributable to the Expansion Space shall be 1.8%. Tenant’s Share attributable to the entire Leased Premises after the addition on the TCD of the Expansion Space shall be 41.11%. The Operating Expense Base for the Expansion Space shall mean the amount of Operating Expenses for the calendar year 2015. From and after the TCD, the 5% cap on increases in Tenant’s Share attributable to the Expansion Space as to increases in Operating Expenses, as set forth in Section 4.02(g) of the H&P Lease, shall be applicable to the Expansion Space and Tenant’s Share shall be made in reference to the base amount established in 2015.

7.                                      Contraction Right. The 6th Floor — West Tower is hereby added as a block of space subject to contraction under Exhibit “B” — Eliminated Space Possibilities of the Second Amendment to Lease dated December 13, 2011.

8.                                      Authority.  Each of Landlord and Tenant represents and warrants to the other that the execution, delivery and performance of this Eleventh Amendment by such party is within the requisite power of such party, has been duly authorized and is not in contravention of the terms of such party’s organizational or governmental documents.

11.                               Binding Effect. Each of Landlord and Tenant further represents and warrants to the other that this Eleventh Amendment, when duly executed and delivered, will constitute a legal, valid, and binding obligation of Tenant, Landlord and all owners of the Building, fully enforceable in accordance with its

respective terms, except as may be limited by bankruptcy, moratorium, arrangement, receivership, insolvency, reorganization or similar laws affecting the rights of creditors generally and the availability of specific performance or other equitable remedies.

12.                               Successors and Assigns. This Eleventh Amendment will be binding on the parties’ successors and assigns.

13.                               Brokers.  Tenant warrants that it has had no dealings with any broker or agent other than CBRE, Inc. (the “Broker”) in connection with the negotiation or execution of this Eleventh Amendment.  Landlord shall indemnify and hold Tenant harmless from and against any cost, expenses or liability for commissions or other compensation or charges of Broker. Tenant agrees to indemnify Landlord and hold Landlord harmless from and against any and all costs, expenses or liability for commissions or other compensations or charges claimed to be owed by Tenant to any broker or agent, other than Broker, with respect to this Eleventh Amendment or the transactions evidenced hereby.

14.                               Amendments. With the exception of those terms and conditions specifically modified and amended herein, the Lease shall remain in full force and effect in accordance with all its terms and conditions. In the event of any conflict between the terms and provisions of this Eleventh Amendment and the terms and provisions of the Lease, the terms and provisions of this Eleventh Amendment shall supersede and control.

15.                               Counterparts. This Eleventh Amendment may be executed in any number of counterparts, each of which shall be deemed an original, and all of such counterparts shall constitute one agreement. To facilitate execution of this Eleventh Amendment, the parties may execute and exchange facsimile counterparts of the signature pages and facsimile counterparts shall serve as originals.

16.                               Disclosure. Members of the Boulder Towers Tenants in Common are licensed real estate brokers in the State of Oklahoma and are affiliated with Commercial Realty, LLC d/b/a CB Richard Ellis Oklahoma; they are also partners in Boulder Towers Tenants in Common, the Landlord.

[Signatures on following page.]

IN WITNESS WHEREOF, the parties hereto have executed this Eleventh Amendment to be effective as of the day and year as set forth above.