Exhibit 10.1

EXECUTION COPY

CONTRIBUTION AGREEMENT

DATED AS OF NOVEMBER 20, 2012

BY AND BETWEEN

CYRUSONE LP,

a Maryland limited partnership

AND

DATA CENTERS SOUTH INC.,

a Delaware corporation



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TABLE OF CONTENTS



|                                                            |  |                                           |  |      |   | 
|----------------------------------------------------------- |  | ----------------------------------------- |  | ---- | - | 
|                                                            |  |                                           |  | Page |  
|                                                           
|ARTICLE I                                                   | 
|                                                           
|CONTRIBUTION                                                | 
|                                                            |  |                                          
|Section 1.01.                                               |  | CONTRIBUTION OF CONTRIBUTED ASSETS        |  |      | 2 | 
|Section 1.02.                                               |  | ASSUMPTION OF THE ASSUMED LIABILITIES     |  |      | 2 | 
|Section 1.03.                                               |  | TRANSFER OF THE OP UNITS                  |  |      | 3 | 
|Section 1.04.                                               |  | FURTHER ACTION                            |  |      | 3 | 
|Section 1.05.                                               |  | TREATMENT AS CONTRIBUTION                 |  |      | 3 | 
|                                                           
|ARTICLE II                                                  | 
|                                                           
|CLOSING                                                     | 
|                                                            |  |                                          
|Section 2.01.                                               |  | CONDITIONS PRECEDENT                      |  |      | 4 | 
|Section 2.02.                                               |  | TIME AND PLACE                            |  |      | 5 | 
|Section 2.03.                                               |  | DELIVERY OF OP UNITS                      |  |      | 5 | 
|Section 2.04.                                               |  | CLOSING DELIVERIES                        |  |      | 6 | 
|Section 2.05.                                               |  | TERM OF THE AGREEMENT                     |  |      | 6 | 
|Section 2.06.                                               |  | EFFECT OF TERMINATION                     |  |      | 6 | 
|Section 2.07.                                               |  | TAX WITHHOLDING                           |  |      | 6 | 
|                                                           
|ARTICLE III                                                 | 
|                                                           
|REPRESENTATIONS AND WARRANTIES OF THE OPERATING PARTNERSHIP | 
|                                                            |  |                                          
|Section 3.01.                                               |  | ORGANIZATION; AUTHORITY                   |  |      | 6 | 
|Section 3.02.                                               |  | DUE AUTHORIZATION                         |  |      | 7 | 
|Section 3.03.                                               |  | CONSENTS AND APPROVALS                    |  |      | 7 | 
|Section 3.04.                                               |  | NO VIOLATION                              |  |      | 7 | 
|Section 3.05.                                               |  | VALIDITY OF OP UNITS                      |  |      | 8 | 
|Section 3.06.                                               |  | LITIGATION                                |  |      | 8 | 
|Section 3.07.                                               |  | OP AGREEMENT                              |  |      | 8 | 
|Section 3.08.                                               |  | LIMITED ACTIVITIES                        |  |      | 8 | 
|Section 3.09.                                               |  | NO OTHER REPRESENTATIONS OR WARRANTIES    |  |      | 8 | 
|                                                           
|ARTICLE IV                                                  | 
|                                                           
|REPRESENTATIONS AND WARRANTIES OF THE CONTRIBUTOR           | 
|                                                            |  |                                          
|Section 4.01.                                               |  | ORGANIZATION; AUTHORITY                   |  |      | 8 | 
|Section 4.02.                                               |  | DUE AUTHORIZATION                         |  |      | 8 | 
|Section 4.03.                                               |  | OWNERSHIP OF THE OTHER CONTRIBUTED ASSETS |  |      | 9 | 
|Section 4.04.                                               |  | OWNERSHIP OF THE PROPERTIES               |  |      | 9 | 



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|                               |  |                                                                                  |  |  |    | 
|------------------------------ |  | -------------------------------------------------------------------------------- |  |  | -- | 
|Section 4.05.                  |  | CONSENTS AND APPROVALS                                                           |  |  | 9  | 
|Section 4.06.                  |  | NO VIOLATION                                                                     |  |  | 10 | 
|Section 4.07.                  |  | NON-FOREIGN PERSON                                                               |  |  | 10 | 
|Section 4.08.                  |  | TAXES                                                                            |  |  | 10 | 
|Section 4.09.                  |  | SOLVENCY                                                                         |  |  | 10 | 
|Section 4.10.                  |  | LITIGATION                                                                       |  |  | 10 | 
|Section 4.11.                  |  | COMPLIANCE WITH LAWS                                                             |  |  | 10 | 
|Section 4.12.                  |  | EMINENT DOMAIN                                                                   |  |  | 11 | 
|Section 4.13.                  |  | LICENSES AND PERMITS                                                             |  |  | 11 | 
|Section 4.14.                  |  | ENVIRONMENTAL COMPLIANCE                                                         |  |  | 11 | 
|Section 4.15.                  |  | CUSTOMER LEASES                                                                  |  |  | 11 | 
|Section 4.16.                  |  | ZONING                                                                           |  |  | 11 | 
|Section 4.17.                  |  | INVESTMENT                                                                       |  |  | 12 | 
|Section 4.18.                  |  | NO OTHER REPRESENTATIONS OR WARRANTIES                                           |  |  | 12 | 
|                              
|ARTICLE V                      | 
|                              
|INDEMNIFICATION                | 
|                               |  |                                                                                 
|Section 5.01.                  |  | GENERAL INDEMNIFICATION                                                          |  |  | 13 | 
|Section 5.02.                  |  | NOTICE OF CLAIMS                                                                 |  |  | 13 | 
|Section 5.03.                  |  | THIRD PARTY CLAIMS                                                               |  |  | 13 | 
|Section 5.04.                  |  | EXPIRATION                                                                       |  |  | 14 | 
|Section 5.05.                  |  | LIMITATIONS ON AMOUNTS                                                           |  |  | 14 | 
|Section 5.06.                  |  | EXCLUSIVE REMEDY                                                                 |  |  | 15 | 
|Section 5.07.                  |  | TAX TREATMENT                                                                    |  |  | 15 | 
|                              
|ARTICLE VI                     | 
|                              
|COVENANTS AND OTHER AGREEMENTS | 
|                               |  |                                                                                 
|Section 6.01.                  |  | COVENANTS OF THE CONTRIBUTOR                                                     |  |  | 15 | 
|Section 6.02.                  |  | COMMERCIALLY REASONABLE EFFORTS BY THE OPERATING PARTNERSHIP AND THE CONTRIBUTOR |  |  | 15 | 
|Section 6.03.                  |  | TAX AGREEMENT                                                                    |  |  | 15 | 
|                              
|ARTICLE VII                    | 
|                              
|WAIVERS AND CONSENTS           | 
|                              
|ARTICLE VIII                   | 
|                              
|GENERAL PROVISIONS             | 
|                               |  |                                                                                 
|Section 8.01.                  |  | NOTICES                                                                          |  |  | 16 | 
|Section 8.02.                  |  | DEFINITIONS                                                                      |  |  | 16 | 
|Section 8.03.                  |  | COUNTERPARTS                                                                     |  |  | 20 | 



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|              |  |                                             |  |  |    | 
|------------- |  | ------------------------------------------- |  |  | -- | 
|Section 8.04. |  | ENTIRE AGREEMENT; THIRD-PARTY BENEFICIARIES |  |  | 20 | 
|Section 8.05. |  | GOVERNING LAW                               |  |  | 20 | 
|Section 8.06. |  | ASSIGNMENT                                  |  |  | 20 | 
|Section 8.07. |  | JURISDICTION                                |  |  | 20 | 
|Section 8.08. |  | SEVERABILITY                                |  |  | 21 | 
|Section 8.09. |  | RULES OF CONSTRUCTION                       |  |  | 21 | 
|Section 8.10. |  | EQUITABLE REMEDIES                          |  |  | 22 | 
|Section 8.11. |  | DESCRIPTIVE HEADINGS                        |  |  | 22 | 
|Section 8.12. |  | NO PERSONAL LIABILITY CONFERRED             |  |  | 22 | 
|Section 8.13. |  | AMENDMENT; WAIVER                           |  |  | 22 | 



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Defined Terms



|                                   |  |             
|---------------------------------- |  | ------------
|TERM                               |  | SECTION     
|Affiliate                          |  | Section 8.02
|Agreement                          |  | Introduction
|Assumed Agreements                 |  | Section 1.01
|Assumed Liabilities                |  | Section 1.02
|Business Day                       |  | Section 8.02
|CBI                                |  | Recitals    
|CBI Intercompany Debt              |  | Recitals    
|CBTS                               |  | Recitals    
|CBTS Intercompany Debt             |  | Recitals    
|Claim                              |  | Article V   
|Claim Notice                       |  | Article V   
|Closing                            |  | Section 2.02
|Closing Date                       |  | Section 2.02
|Code                               |  | Section 8.02
|Contributed Assets                 |  | Section 1.01
|Contributor                        |  | Introduction
|Customer Leases                    |  | Section 4.15
|CyrusOne Credit Agreement          |  | Section 8.02
|CyrusOne GP                        |  | Recitals    
|Debt Issuance                      |  | Recitals    
|Environmental Law                  |  | Section 8.02
|Environmental Liabilities          |  | Section 8.02
|Environmental Permits              |  | Section 8.02
|Expiration Date                    |  | Article V   
|Fixtures and Personal Property     |  | Section 8.02
|Formation Transactions             |  | Recitals    
|Governmental Authority             |  | Section 8.02
|Governmental Authorization         |  | Section 8.02
|Hazardous Material                 |  | Section 8.02
|Indemnified Party                  |  | Article V   
|Indemnifying Party                 |  | Article V   
|Intercompany Debt                  |  | Recitals    
|Law                                |  | Section 8.02
|Liability                          |  | Section 8.02
|Liens                              |  | Section 8.02
|Losses                             |  | Article V   
|Material Adverse Effect            |  | Section 8.02
|OP Units                           |  | Recitals    
|OP Value                           |  | Section 5.05
|Operating Partnership              |  | Introduction
|Operating Partnership Agreement    |  | Section 1.05
|Operating Partnership Subsidiaries |  | Section 3.01
|Order                              |  | Section 8.02
|Other Contributed Assets           |  | Section 1.01
|Outside Date                       |  | Section 2.05
|Permitted Lien                     |  | Section 8.02
|Person                             |  | Section 8.02
|Proceeding                         |  | Section 8.02



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|                    |  |             
|------------------- |  | ------------
|TERM                |  | SECTION     
|Properties          |  | Recitals    
|Property Interests  |  | Recitals    
|REIT                |  | Introduction
|Release             |  | Section 8.02
|Securities Act      |  | Section 8.02
|Service Contracts   |  | Section 8.02
|Subsidiary          |  | Section 8.02
|Tax                 |  | Section 8.02
|Tax Return          |  | Section 8.02
|Third Party Claims  |  | Article V   
|Total Consideration |  | Recitals    



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CONTRIBUTION AGREEMENT

THIS CONTRIBUTION AGREEMENT is made and entered into as of November 20, 2012 (this Agreement), by and between
CyrusOne LP, a Maryland limited partnership (the Operating Partnership), which is a Subsidiary of CyrusOne Inc., a Maryland corporation (the REIT), and Data Centers South Inc., a Delaware corporation (the
Contributor).

RECITALS

WHEREAS, the REIT desires to consolidate the ownership of a portfolio of properties listed on Exhibit A (the Properties) through a series of transactions whereby the Operating
Partnership will acquire interests in the Properties;

WHEREAS, the Contributor owns or holds fee simple or leasehold
interests in the Properties (the Property Interests);

WHEREAS, the transactions contemplated by this
Agreement and certain other internal restructuring transactions to be completed prior to or on the Closing Date as set forth on Exhibit B-1 (collectively, the Formation Transactions) are related to the proposed issuance of
6.375% senior notes due 2022 by the Operating Partnership and CyrusOne Finance Corp., a Maryland corporation, as co-issuers (the Debt Issuance);

WHEREAS, the Contributor owes $401,509,589 aggregate amount (representing principal plus accrued interest) of intercompany debt to Cincinnati Bell Inc., an Ohio corporation (CBI) (such
debt, the CBI Intercompany Debt);

WHEREAS, the CBI Intercompany Debt was incurred on June 11, 2010 by
Cincinnati Bell Technology Solutions Inc., a Delaware corporation (CBTS), in order to fund its acquisition of the entity that held certain Contributed Assets (as defined) at the time of such acquisition;

WHEREAS, the Contributor owes $60,386,849 aggregate amount (representing principal plus accrued interest) of intercompany debt to CBTS
(such debt, the CBTS Intercompany Debt, and together with the CBI Intercompany Debt, the Intercompany Debt);

WHEREAS, the CBTS Intercompany Debt was incurred by CyrusOne LLC, a Delaware limited liability company (formerly CyrusOne Inc., a Delaware corporation), in order to fund acquisitions of, and improvements
to, certain Contributed Assets;

WHEREAS, the CBI Intercompany Debt and the CBTS Intercompany Debt have been assumed by a
series of entities in connection with a series of contributions of the Contributed Assets (or, in certain cases, the entity that owned such assets) to which such debt relates;

WHEREAS, the Contributor desires to, and the Operating Partnership desires the Contributor to, contribute to the Operating Partnership, all of the Contributors right, title and interest in and to
the Property Interests and the Other Contributed Assets (as defined), free and clear of all Liens, except for Permitted Liens, in exchange for units of limited partnership interest (OP Units) in the Operating Partnership and the
assumption by the Operating Partnership of



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the Assumed Liabilities (as defined) (the transfer of such OP units to the Contributor and assumption of such Assumed Liabilities by the Operating Partnership, collectively, the Total
Consideration), on the terms and subject to the conditions set forth herein; and

WHEREAS, all necessary approvals
have been obtained by the parties to this Agreement to consummate the transactions contemplated herein and the other Formation Transactions.

NOW, THEREFORE, in consideration of the foregoing and the representations, warranties, covenants and other terms contained in this Agreement, the parties hereto, intending to be legally bound hereby,
agree as follows:

ARTICLE I

CONTRIBUTION

Section 1.01. CONTRIBUTION OF CONTRIBUTED ASSETS. Upon
the terms and subject to the conditions set forth herein, for the Total Consideration, at the Closing, the Contributor shall convey, assign and transfer to the Operating Partnership, and the Operating Partnership agrees to acquire and accept from
the Contributor, free and clear of all Liens, except for Permitted Liens, the Contributed Assets. For purposes of this Agreement, the term Contributed Assets shall mean all of the Contributors right, title and interest in
and to the following:

(a) its Property Interests;

(b) those assets described on Exhibit C-1, and all right, title and interest held directly or indirectly by the
Contributor in (i) all Fixtures and Personal Property related to the Properties and (ii) all intangible personal property now or hereafter used in connection with the ownership, operation, maintenance, management or occupancy of the
Properties;

(c) those certain agreements described on Exhibit C-2, and all agreements and arrangements
related to the Properties, if any, to which the Contributor is a party, directly or indirectly, including all tenant leases and Service Contracts (collectively, the Assumed Agreements); and

(d) all other properties, assets and rights of any kind, whether tangible or intangible, real or personal, held directly
or indirectly by the Contributor (the Contributed Assets described in Section 1.01(b), (c) and (d), collectively, the Other Contributed Assets).

Section 1.02. ASSUMPTION OF THE ASSUMED LIABILITIES. Upon the terms and subject to the conditions set forth in this Agreement, at the Closing, the Operating Partnership shall assume from the
Contributor and thereafter pay, perform or discharge in accordance with their terms any and all Liabilities of the Contributor, whether arising before, on or after the Closing Date, including the following Liabilities (collectively, the
Assumed Liabilities):



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(a) all accounts payable outstanding as of or arising after the Closing
Date;

(b) all Liabilities in connection with the Intercompany Debt;

(c) all Liabilities to the extent arising out of, or related to, any Contributed Asset, or arising out of, related to or
measured by the ownership by the Contributor and its Affiliates of any Contributed Asset or associated with the realization of the benefits of any Contributed Asset (including all Liabilities arising out of, or related to, any termination or
announcement or notification of an intent to terminate any Assumed Agreement);

(d) all Environmental
Liabilities to the extent relating to any Contributed Asset;

(e) all Liabilities in respect of any Proceeding
to the extent arising out of or related to any Contributed Asset (including any such Liabilities to the extent relating to any product liability, consumer protection, consumer fraud, breach of warranty or similar claim for injury or death to person
or damage to or destruction of property);

(f) all Tax Liabilities arising out of, related to or measured by
the ownership of the Contributed Assets for any taxable period or portion thereof beginning after the Closing Date; and

(g) all other Liabilities of whatever kind and nature, primary or secondary, direct or indirect, whether accrued or fixed, known or unknown, absolute or contingent, matured or unmatured or determined or
determinable of the Contributor.

Section 1.03. TRANSFER OF THE OP UNITS. Upon the terms and subject to the conditions
set forth in this Agreement, at the Closing, the Operating Partnership shall transfer to the Contributor 68,650,250 OP Units. The transfer of OP Units to the Contributor shall be evidenced by an amendment to the Operating Partnership Agreement in
such form as shall be reasonably acceptable to the Contributor.

Section 1.04. FURTHER ACTION. If, at any time after the
Closing, the Operating Partnership shall determine or be advised that any deeds, bills of sale, assignments, assurances or other actions or things are necessary or desirable to vest, perfect or confirm of record or otherwise in the Operating
Partnership the right, title or interest in or to the Contributed Assets or Assumed Liabilities contributed by the Contributor, the Contributor shall execute and deliver all such deeds, bills of sale, assignments and assurances and take and do all
such other actions and things as may be necessary or desirable to vest, perfect or confirm any and all right, title and interest in or to such Contributed Assets or Assumed Liabilities, or otherwise to carry out this Agreement; provided, that
the Contributor shall not be obligated to take any action or execute any document if the additional actions or documents impose additional liabilities, obligations, covenants, responsibilities, representations or warranties on the Contributor that
are not contemplated by this Agreement or reasonably inferable by the terms herein.

Section 1.05. TREATMENT AS
CONTRIBUTION.



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(a) Any transfer, assignment and exchange by the Contributor effectuated
pursuant to this Agreement shall constitute a Capital Contribution by the Contributor to the Operating Partnership as defined in Article I of the Operating Partnership Agreement (as defined) and is intended to be governed by
Section 721(a) of the Code.

(b) The Contributor and the Operating Partnership agree to the tax treatment
described in Section 1.05(a), and the Contributor and the Operating Partnership shall file their respective Tax Returns consistent with such treatment, unless otherwise required by applicable Law.

ARTICLE II

CLOSING

Section 2.01. CONDITIONS PRECEDENT.

(a) Condition to Each Partys Obligations. The respective obligation of each party to effect the contributions contemplated by this Agreement and to consummate the other transactions
contemplated hereby to occur on the Closing Date is subject to the satisfaction or waiver of the following conditions:

(i) Debt Issuance Proceeds. All conditions to the Debt Issuance shall have been satisfied and the initial purchasers under the purchase agreement relating to the Debt Issuance shall be prepared to
fund the Debt Issuance. This condition may not be waived by any party.

(ii) No Injunction. No
Governmental Authority shall have enacted, issued, promulgated, enforced or entered any statute, rule, regulation, executive order, decree, judgment, injunction or other order (whether temporary, preliminary or permanent), in any case which is in
effect and which prevents or prohibits consummation of any of the transactions contemplated in this Agreement or any of the other Formation Transactions nor shall any of the same brought by a Governmental Authority of competent jurisdiction be
pending that seeks the foregoing.

(iii) Formation Transactions. The Formation Transactions set forth on
Exhibit B-2 shall have been consummated not later than concurrently herewith. This condition may not be waived by any party.

(b) Conditions to Obligations of the Operating Partnership. The obligations of the Operating Partnership are further subject to satisfaction of the following conditions (any of which may be waived
by the Operating Partnership in whole or in part):

(i) Representations and Warranties. Except as would
not have a Material Adverse Effect, the representations and warranties of the Contributor contained in this Agreement shall be true and correct at and as of the Closing



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(except to the extent that any such representation or warranty speaks as of an earlier date, in which case it must be true and correct only as of such earlier date).

(ii) Performance by the Contributor. The Contributor shall have performed in all material respects all agreements
and covenants required by this Agreement to be performed or complied with by it on or prior to the Closing Date.

(iii) Consents, Etc. All necessary consents and approvals of Governmental Authorities or third parties (including
lenders) for the Contributor to consummate the transactions contemplated hereby (except for those the absence of which would not have a material adverse effect on the ability of the Contributor to consummate the transactions contemplated by this
Agreement) and the other Formation Transactions shall have been obtained.

(iv) No Material Adverse
Change. There shall not have occurred between the date hereof and the Closing Date any material adverse change in the business, financial condition, properties or results of operations of the Contributor.

(c) Conditions to Obligations of the Contributor. The obligations of the Contributor are further subject to
satisfaction of the following conditions (any of which may be waived by the Contributor in whole or in part):

(i) Representations and Warranties. Except as would not have a Material Adverse Effect, the representations and
warranties of the Operating Partnership contained in this Agreement shall be true and correct at and as of the Closing (except to the extent that any such representation or warranty speaks as of an earlier date, in which case it must be true and
correct only as of such earlier date).

(ii) Performance by the Operating Partnership. The Operating
Partnership shall have performed in all material respects all agreements and covenants required by this Agreement to be performed or complied with by it on or prior to the Closing Date.

Section 2.02. TIME AND PLACE. Unless this Agreement shall have been terminated pursuant to Section 2.05, and subject to
satisfaction or waiver of the conditions in Section 2.01, the closing of the transfers contemplated by Sections 1.01, 1.02 and 1.03 and the other transactions contemplated hereby (the Closing) shall occur immediately prior to
the time the Operating Partnership receives the proceeds from the Debt Issuance on November 20, 2012 (the Closing Date). The Closing shall take place at the offices of Cravath, Swaine & Moore LLP, 825 Eighth Avenue,
New York, New York 10019 or such other place as mutually determined by the parties hereto. The transfers described in Sections 1.01, 1.02 and 1.03 and all closing deliveries shall be deemed concurrent for all purposes.

Section 2.03. DELIVERY OF OP UNITS. The issuance of the OP Units to the Contributor shall be evidenced by an amendment to the
Operating Partnership Agreement in such form as shall be reasonably acceptable to the Contributor.



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Section 2.04. CLOSING DELIVERIES. At the Closing, the parties shall make, execute,
acknowledge and deliver, or cause to be made, executed, acknowledged and delivered, any other documents reasonably requested by the Operating Partnership or the Contributor or reasonably necessary or desirable to assign, transfer, convey, contribute
and deliver the Contributed Assets or Assumed Liabilities, free and clear of all Liens, except for Permitted Liens, and to effectuate the transactions contemplated hereby.

Section 2.05. TERM OF THE AGREEMENT. This Agreement shall terminate automatically if the contributions contemplated by this Agreement shall not have been consummated on or prior to the second
Business Day following the date hereof (such date is hereinafter referred to as the Outside Date), unless extended in writing by the parties to this Agreement.

Section 2.06. EFFECT OF TERMINATION. In the event of termination of this Agreement for any reason, all obligations on the part of
the Operating Partnership and the Contributor under this Agreement shall terminate, except that the obligations set forth in Article VIII shall survive; it being understood and agreed, however, for the avoidance of doubt, that if this Agreement is
terminated because one or more of the conditions to a non-breaching partys obligations under this Agreement is not satisfied by the Outside Date as a result of the other partys material breach of a covenant, representation, warranty or
other obligation under this Agreement, the non-breaching partys right to pursue all legal remedies with respect to such breach will survive such termination unimpaired.

Section 2.07. TAX WITHHOLDING. The Operating Partnership shall be entitled to deduct and withhold, from the consideration payable pursuant to this Agreement to the Contributor, such amounts as the
Operating Partnership is required to deduct and withhold with respect to the making of such payment under the Code or any provision of state, local or foreign Tax Law. To the extent that amounts are so withheld by the Operating Partnership, such
withheld amounts shall be treated for all purposes of this Agreement as having been paid to the Contributor in respect of which such deduction and withholding was made by the Operating Partnership.

ARTICLE III

REPRESENTATIONS AND WARRANTIES OF THE OPERATING PARTNERSHIP

The Operating
Partnership hereby represents and warrants to and covenants with the Contributor as follows:

Section 3.01. ORGANIZATION;
AUTHORITY.

(a) The Operating Partnership is a limited partnership duly organized, validly existing and in good
standing under the Law of the State of Maryland. The Operating Partnership has all requisite power and authority to enter this Agreement and each other agreement, document and instrument contemplated hereby and to carry out the transactions
contemplated hereby and thereby, and to own, lease or operate its property and to carry on its business as presently conducted and, to the extent required under



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applicable Law, is qualified to do business and is in good standing in each jurisdiction in which the nature of its business or the character of its property make such qualification necessary,
other than in such jurisdictions where the failure to be so qualified would not have a material adverse effect on the business, financial condition, properties or results of operations of the Operating Partnership and the Subsidiaries of the
Operating Partnership (the Operating Partnership Subsidiaries and, each individually, an Operating Partnership Subsidiary), taken as a whole.

(b) Exhibit D sets forth as of the date hereof, (i) each Operating Partnership Subsidiary, (ii) the
ownership interest therein of the Operating Partnership and (iii) if not wholly owned by the Operating Partnership, the identity and ownership interest of each of the other owners of such Operating Partnership Subsidiary. Each Operating
Partnership Subsidiary has been duly organized or formed and is validly existing under the Law of its jurisdiction of organization or formation, as applicable, has all power and authority to own, lease or operate its property and to carry on its
business as presently conducted and, to the extent required under applicable Law, is qualified to do business and is in good standing in each jurisdiction in which the nature of its business or the character of its property make such qualification
necessary, except where the failure to be so qualified would not have a material adverse effect on the business, financial condition, properties or results of operations of the Operating Partnership and the Operating Partnership Subsidiaries, taken
as a whole.

Section 3.02. DUE AUTHORIZATION. The execution, delivery and performance of this Agreement and each other
agreement, document and instrument contemplated hereby by the Operating Partnership has been duly and validly authorized by all necessary action of the Operating Partnership. This Agreement and each agreement, document and instrument executed and
delivered by or on behalf of the Operating Partnership pursuant to this Agreement constitutes, or when executed and delivered will constitute, the legal, valid and binding obligation of the Operating Partnership, each enforceable against the
Operating Partnership in accordance with its terms, subject to applicable bankruptcy, insolvency, moratorium or other similar Law relating to creditors rights and general principles of equity.

Section 3.03. CONSENTS AND APPROVALS. Except in connection with the Debt Issuance or as set forth on Schedule 3.03, no
material consent, waiver, approval or authorization of, or filing with, any Person or Governmental Authority or under any applicable Law is required to be obtained by the Operating Partnership in connection with the execution, delivery and
performance of this Agreement, the transactions contemplated hereby or the other Formation Transactions.

Section 3.04.
NO VIOLATION. None of the execution, delivery or performance of this Agreement, or any agreement contemplated hereby between the parties to this Agreement or the consummation of the transactions contemplated hereby or thereby (including the other
Formation Transactions) does or will, with or without the giving of notice, lapse of time, or both, violate, conflict with, result in a breach of, or constitute a default under (a) the organizational documents of the Operating Partnership,
(b) any term or provision of any judgment, order, writ, injunction, or decree binding on the Operating Partnership or (c) any other agreement to which the Operating Partnership is a party thereto.



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Section 3.05. VALIDITY OF OP UNITS. The OP Units to be issued to the Contributor
pursuant to this Agreement have been duly authorized by the Operating Partnership and, when issued against the consideration therefor, will be validly issued by the Operating Partnership, free and clear of all Liens created by the Operating
Partnership (other than Liens created by the Operating Partnership Agreement).

Section 3.06. LITIGATION. There is no
action, suit or proceeding pending or, to the Operating Partnerships knowledge, threatened against the Operating Partnership or any Operating Partnership Subsidiary which, if adversely determined, would be reasonably expected to have a
material adverse effect on the business, financial condition, properties or results of operations of the Operating Partnership and the Operating Partnership Subsidiaries, taken as a whole, or which would reasonably be expected to impair the ability
of the Operating Partnership to execute or deliver, or perform its obligations under, this Agreement and each other agreement, document and instrument executed by it pursuant to this Agreement or to consummate the transactions contemplated hereby or
thereby.

Section 3.07. OP AGREEMENT. Attached as Exhibit E hereto is a true and complete copy of the Operating
Partnership Agreement.

Section 3.08. LIMITED ACTIVITIES. Except for activities in connection with the Debt Issuance or
the Formation Transactions, the Operating Partnership and the Operating Partnership Subsidiaries have not engaged in any material business or incurred any material obligations.

Section 3.09. NO OTHER REPRESENTATIONS OR WARRANTIES. Other than the representations and warranties expressly set forth in this
Article III, the Operating Partnership shall not be deemed to have made any other representation or warranty in connection with this Agreement or the transactions contemplated hereby.

ARTICLE IV

REPRESENTATIONS AND WARRANTIES OF THE CONTRIBUTOR

The Contributor hereby represents, warrants and agrees that as of the Closing Date:

Section 4.01. ORGANIZATION; AUTHORITY. The Contributor is a corporation duly organized, validly existing and in good standing under the Law of the State of Delaware. The Contributor has all requisite
power and authority to enter this Agreement and each other agreement, document and instrument contemplated hereby and to carry out the transactions contemplated hereby and thereby, and to own, lease or operate its property and to carry on its
business as presently conducted and, to the extent required under applicable Law, is qualified to do business and is in good standing in each jurisdiction in which the nature of its business or the character of its property make such qualification
necessary, other than in such jurisdictions where the failure to be so qualified would not have a material adverse effect on the business, financial condition, properties or results of operations of the Contributor.

Section 4.02. DUE AUTHORIZATION. The execution, delivery and performance of this Agreement and each other agreement, document and
instrument contemplated hereby by the



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Contributor has been duly and validly authorized by all necessary action of the Contributor. This Agreement and each agreement, document and instrument executed and delivered by or on behalf of
the Contributor pursuant to this Agreement constitutes, or when executed and delivered will constitute, the legal, valid and binding obligation of the Contributor, each enforceable against the Contributor in accordance with its terms, subject to
applicable bankruptcy, insolvency, moratorium or other similar Law relating to creditors rights and general principles of equity.

Section 4.03. OWNERSHIP OF THE OTHER CONTRIBUTED ASSETS. The Contributor is the record owner of, or otherwise has good and valid title to, the Other Contributed Assets and has the power and authority
to transfer, sell, assign and convey to the Operating Partnership such Other Contributed Assets free and clear of any Liens, except for Permitted Liens, and, upon delivery of the consideration for such Other Contributed Assets as provided herein,
the Operating Partnership will acquire good and valid title thereto, free and clear of any Liens, except for Permitted Liens and Liens created by the Operating Partnership Agreement.

Section 4.04. OWNERSHIP OF THE PROPERTIES.

(a) Except as set forth on Schedule 4.04(a), the Contributor has good and marketable title in fee simple to all Properties designated as owned real property in Exhibit A hereto and has the
power and authority to transfer, sell, assign and convey to the Operating Partnership such owned real property free and clear of all Liens, except for Permitted Liens, and, upon delivery of the consideration for such owned real property as provided
herein, the Operating Partnership will acquire good and valid title thereto, free and clear of any Liens, except for Permitted Liens and Liens created by the Operating Partnership Agreement.

(b) Except as set forth on Schedule 4.04(b), the Contributor has a valid leasehold interest in, and enjoys peaceful
and undisturbed possession (consistent with historical use) of all Properties designated as leased real property in Exhibit A hereto, and has the power and authority to transfer, sell, assign and convey to the Operating Partnership such
leased real property free and clear of all Liens, except Permitted Liens, and, upon delivery of the consideration for such leased real property as provided herein, the Operating Partnership will acquire a valid leasehold interest thereto, free and
clear of any Liens, except for Permitted Liens and Liens created by the Operating Partnership Agreement. The Contributor has not received any written notice of any material uncured default under any of the real property leases pursuant to which it
leases such Properties, and to the Contributors knowledge there is no material uncured default by any landlord thereunder, except in each case as would not reasonably be expected to have a Material Adverse Effect.

Section 4.05. CONSENTS AND APPROVALS. Except as shall have been satisfied on or prior to the Closing Date, no consent, waiver,
approval or authorization of, or filing with, any Person or Governmental Authority or under any applicable Law is required to be obtained by the Contributor in connection with the execution, delivery and performance of this Agreement, each other
agreement, document and instrument contemplated hereby, the transactions contemplated



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hereby or the other Formation Transactions, except for those consents, waivers, approvals, authorizations or filings, the failure of which to obtain or to file would not have a Material Adverse
Effect.

Section 4.06. NO VIOLATION. None of the execution, delivery or performance of this Agreement, or any agreement
contemplated hereby between the parties to this Agreement or the consummation of the transactions contemplated hereby or thereby (including the other Formation Transactions) does or will, with or without the giving of notice, lapse of time, or both,
violate, conflict with, result in a breach of, or constitute a default under or give to others any right of termination, acceleration, cancelation or other right under, (a) the organizational documents of the Contributor, (b) any
agreement, document or instrument to which the Contributor is a party or by which the Contributor is bound or (c) any term or provision of any judgment, order, writ, injunction or decree binding on the Contributor (or its assets or properties),
except, in the case of (b) and (c) any such breaches or defaults that would not have a Material Adverse Effect.

Section 4.07. NON-FOREIGN PERSON. The Contributor is a United States person (as defined in the Code) and is, therefore, not subject
to the provisions of the Code relating to the withholding of sales or exchange proceeds to foreign persons.

Section 4.08. TAXES. To the Contributors knowledge, and except as would not have a Material Adverse Effect, (a) all Tax
Returns and reports required to be filed with respect to the Contributed Assets have been timely filed (after giving effect to any filing extension properly granted by a Governmental Authority having authority to do so) and all such returns and
reports are accurate and complete in all material respects, and all Taxes required to be paid with respect to the Contributed Assets have been paid and (b) no deficiencies for any Taxes have been proposed, asserted or assessed with respect to
the Contributed Assets, and no requests for waivers of the time to assess any such Taxes are pending.

Section 4.09.
SOLVENCY. The Contributor has been and will be solvent at all times prior to and for the 90-day period following the transfer of the Contributed Assets and Assumed Liabilities to the Operating Partnership.

Section 4.10. LITIGATION. There is no action, suit or proceeding pending or, to the Contributors knowledge, threatened against
the Contributor which, if adversely determined, would reasonably be expected to impair the ability of the Contributor to execute or deliver, or perform its obligations under, this Agreement and each other agreement, document and instrument executed
by it pursuant to this Agreement or to consummate the transactions contemplated hereby or thereby or the other Formation Transactions.

Section 4.11. COMPLIANCE WITH LAWS. Except as set forth on Schedule 4.11, the Properties have been maintained, and the Contributor has not received written notice that any such Property is
not, in compliance in all material respects with all applicable laws, ordinances, rules, regulations, codes, orders and statutes (including, without limitation, those currently relating to fire safety, conservation, parking, Americans with
Disabilities Act, zoning and building laws) whether federal, state or local, except where the failure to so comply would not have a Material Adverse Effect. Compliance with Environmental Laws is not addressed by this Section 4.11, but rather
solely by Section 4.14.



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Section 4.12. EMINENT DOMAIN. There is no existing or, to the Contributors
knowledge, proposed or threatened condemnation, eminent domain or similar proceeding, or private purchase in lieu of such a proceeding, in respect of all or any material portion of the Properties.

Section 4.13. LICENSES AND PERMITS. Except as set forth on Schedule 4.13, to the Contributors knowledge, all licenses,
permits or other governmental approvals (including certificates of occupancy) required to be obtained by the owner of any Property in connection with the construction, use, occupancy, management, leasing and operation of such Properties have been
obtained and are in full force and effect and in good standing, except for those licenses, permits and other governmental approvals, the failure of which to obtain or maintain in good standing would not have a Material Adverse Effect.

Section 4.14. ENVIRONMENTAL COMPLIANCE. Except as set forth on Schedule 4.14, the Contributor is currently in compliance with
all Environmental Laws and Environmental Permits, except where the failure to so comply would not have a Material Adverse Effect. The Contributor has not received any written notice from the United States Environmental Protection Agency or any other
federal, state, county or municipal entity or agency that regulates Hazardous Materials or public health risks or other environmental matters or any other private party or Person claiming any current violation of, or requiring current compliance
with, any Environmental Laws or Environmental Permits or demanding payment or contribution for any Release or other environmental damage in, on, under, or upon any of the Properties. No litigation in which the Contributor is a named party is pending
with respect to Hazardous Materials located in, on, under or upon any of the Properties, and, to such Contributors knowledge, no investigation in such respect is pending and no such litigation or investigation has been threatened in writing in
the last twelve months by any Governmental Entity or any third party. To the Contributors knowledge, except as set forth on Schedule 4.14, there are no environmental conditions existing at, on, under, upon or affecting the Properties
any portion thereof that would reasonably be likely to result in any claim, liability or obligation under any Environmental Laws or Environmental Permit or any claim by any third party that would have a Material Adverse Effect.

Section 4.15. CUSTOMER LEASES. To the Contributors knowledge, except as set forth on Schedule 4.15, (i) all
leases, licenses, subleases, tenancies, possession agreements and occupancy agreements with tenants, subtenants or licensees related to the Properties (the Customer Leases) are in full force and effect, (ii) no monetary or
material non-monetary default (beyond applicable notice and cure periods) by any party exists under any such Customer Lease and (iii) no tenant under any of such Customer Leases is presently the subject of any voluntary or involuntary
bankruptcy or insolvency proceedings, except in each case as would not reasonably be expected to have a Material Adverse Effect.

Section 4.16. ZONING. Except as set forth on Schedule 4.16, the Contributor has not received (i) any written notice (which remains uncured) from any Governmental Authority stating that
any of the Properties is currently violating any zoning, land use or other similar rules or ordinances in any material respect, or (ii) any written notice of any pending or threatened proceedings for the rezoning (i.e., as opposed to the
current zoning) of any of the Properties or any portion thereof except, in each case as would not have a Material Adverse Effect.



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Section 4.17. INVESTMENT. The Contributor acknowledges that the offering and issuance
of the OP Units to be acquired pursuant to this Agreement are intended to be exempt from registration under the Securities Act and that the Operating Partnerships reliance on such exemptions is predicated in part on the accuracy and
completeness of the representations and warranties of the Contributor contained herein. In furtherance thereof, the Contributor represents and warrants to the Operating Partnership as follows:

(a) The Contributor is an accredited investor (as such term is defined in Rule 501(a) of Regulation D
promulgated under the Securities Act).

(b) The Contributor is acquiring the OP Units solely for its own
account for the purpose of investment and not as a nominee or agent for any other Person and not with a view to, or for offer or sale in connection with, any distribution of any thereof in violation of the securities Law.

(c) The Contributor is knowledgeable, sophisticated and experienced in business and financial matters; the Contributor has
previously invested in securities similar to the OP Units and fully understands the limitations on transfer imposed by the federal securities Law. The Contributor is able to bear the economic risk of holding the OP Units for an indefinite period and
is able to afford the complete loss of its investment in the OP Units; the Contributor has received and reviewed all information and documents about or pertaining to the Operating Partnership and the business and prospects of the Operating
Partnership and the issuance of the OP Units as the Contributor deems necessary or desirable, and has been given the opportunity to obtain any additional information or documents and to ask questions and receive answers about such information and
documents, the Operating Partnership and the business and prospects of the Operating Partnership which the Contributor deems necessary or desirable to evaluate the merits and risks related to its investment in the OP Units; and the Contributor
understands and has taken cognizance of all risk factors related to the purchase of the OP Units. The Contributor is relying upon its own independent analysis and assessment (including with respect to taxes), and the advice of the Contributors
advisors (including tax advisors), and not upon that of the Operating Partnership or any of the Operating Partnerships Affiliates, for purposes of evaluating, entering into, and consummating the transactions contemplated hereby.

(d) The Contributor acknowledges that the OP Units have not been registered under the Securities Act and, therefore, may
not be sold unless registered under the Securities Act or an exemption from registration is available.

Section 4.18. NO
OTHER REPRESENTATIONS OR WARRANTIES. Other than the representations and warranties expressly set forth in this Article IV, the Contributor shall not be deemed to have made any other representation or warranty in connection with this Agreement or the
transactions contemplated hereby.



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ARTICLE V

INDEMNIFICATION

Section 5.01. GENERAL INDEMNIFICATION. From and
after the Closing Date, each party hereto (each of which is an Indemnifying Party) shall indemnify and hold harmless the other party and its Affiliates (each of which is an Indemnified Party) from and against
any and all charges, complaints, claims, actions, causes of action, losses, damages, liabilities and expenses of any nature whatsoever, including amounts paid in settlement, reasonable attorneys fees, costs of investigation, costs of
investigative judicial or administrative proceedings or appeals therefrom and costs of attachment or similar bonds (collectively, Losses) arising out of or relating to, asserted against, imposed upon or incurred by the Indemnified
Party in connection with or as a result of any breach of a representation, warranty or covenant of the Indemnifying Party contained in this Agreement or in any schedule, exhibit, certificate or affidavit or any other agreement, document or
instrument delivered by the Indemnifying Party pursuant to this Agreement; provided, however, that: (i) the Operating Partnership shall not have any obligation under this Article to indemnify any Indemnified Party against any
Losses to the extent that such Losses arise by virtue of (A) any diminution in value of the OP Units, (B) the Contributors breach of this Agreement, gross negligence, wilful misconduct or fraud or (C) CyrusOne LLCs
operation of its business or the ownership and operation of its assets outside of the ordinary course of business prior to the Closing Date; and (ii) the Contributor shall not have any obligation under this Article to indemnify any Indemnified
Party against any Losses to the extent that such Losses arise by virtue of (A) any diminution in value of the Properties, (B) the Operating Partnerships breach of this Agreement, gross negligence, wilful misconduct or fraud or
(C) the Operating Partnerships operation of its business or the ownership and operation of its assets outside of the ordinary course of business prior to the Closing Date; and

Section 5.02. NOTICE OF CLAIMS. At the time when any Indemnified Party learns of any potential claim that is subject to
indemnification pursuant to the terms of this Agreement (a Claim) against the Indemnifying Party it will promptly give written notice (a Claim Notice) to the Indemnifying Party; provided that failure to
do so shall not prevent recovery under this Agreement, except to the extent that the Indemnifying Party shall have been materially prejudiced by such failure. Each Claim Notice shall describe in reasonable detail the facts known to such Indemnified
Party giving rise to such Claim, and the amount or good faith estimate of the amount of Losses arising therefrom. Unless prohibited by Law, such Indemnified Party shall deliver to the Indemnifying Party, promptly after such Indemnified Partys
receipt thereof, copies of all notices and documents (including court papers) received by such Indemnified Party relating to claims asserted by third parties (Third Party Claims). Any Indemnified Party may at its option demand
indemnity under this Article V as soon as a Claim has been threatened by a third party, regardless of whether an actual Loss has been suffered, so long as such Indemnified Party shall in good faith determine that such claim is not frivolous and that
such Indemnified Party may be liable for, or otherwise incur, a Loss as a result thereof.

Section 5.03. THIRD PARTY
CLAIMS. The Indemnifying Party shall be entitled, at its own expense, to assume and control the defense of any Claims based on Third Party Claims, through counsel chosen by the Indemnifying Party and reasonably acceptable to such Indemnified Party
(or any person authorized by such Indemnified Party to act on its behalf), if it



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gives written notice of its intention to do so to such Indemnified Party within 30 days of the receipt of the applicable Claim Notice; provided, however, that such Indemnified Party
may at all times participate in such defense at its expense. Without limiting the foregoing, in the event that the Indemnifying Party exercises the right to undertake any such defense against a Third Party Claim, such Indemnified Party shall
cooperate with the Indemnifying Party in such defense and make available to the Indemnifying Party (unless prohibited by Law), at the Indemnifying Partys expense, all witnesses, pertinent records, materials and information in such Indemnified
Partys possession or under such Indemnified Partys control relating thereto as is reasonably required by the Indemnifying Party. No compromise or settlement of such Third Party Claim may be effected by either such Indemnified Party, on
the one hand, or the Indemnifying Party, on the other hand, without the others consent (which consent shall not be unreasonably withheld, conditioned or delayed) unless (i) there is no finding or admission of any violation of Law and no
effect on any other claims that may be made against such other party and (ii) each Indemnified Party that is party to such claim is released from all liability with respect to such claim.

Section 5.04. EXPIRATION.

(a) Subject to the limitations set forth in this Agreement, all representations, warranties, covenants and agreements (including those relating to indemnification in Section 5.01) made herein shall
survive the Closing.

(b) Unless otherwise specified in this Agreement, all representations, warranties and
covenants of the Indemnifying Party contained in this Agreement shall survive until twelve months after the Closing Date (the Expiration Date). If written notice of a claim in accordance with the provisions of this Article V has
been given prior to the Expiration Date, then the relevant representation, warranty and covenant shall survive, but only with respect to such specific claim, until such claim has been finally resolved. Any claim for indemnification not so asserted
in writing by the Expiration Date may not thereafter be asserted and shall forever be waived.

Section 5.05. LIMITATIONS
ON AMOUNTS.

(a) Except as provided in subparagraph (b) below, the Contributor shall not have any
liability under Section 5.01 for any Losses hereunder (i) unless and until the aggregate total amount of all such Losses for which the Contributor would, but for this provision, be liable exceeds, on a cumulative basis, one percent
(1%) of the aggregate fair market value as of the Closing Date of the OP Units issued to the Contributor on the Closing Date (the OP Value), and then only to the extent of such excess, (ii) in excess of, on a cumulative
basis, ten percent (10%) of the fair market value as of the Closing Date of the OP Units issued to the Contributor in respect of any Property, to the extent such Losses are directly related to or arise out of such Property and (iii) in
excess of, on a cumulative basis, ten percent (10%) of the OP Value.

(b) The limitations in subparagraph
(a) above shall not apply to any Losses resulting from breach of Section 4.04 with respect to a specific Property unless and until such time as the Operating Partnership (or a Subsidiary of the Operating Partnership)



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obtains an endorsement providing the Operating Partnership with the benefit of the existing title insurance policy held by CBI or one of its Subsidiaries with respect to such Property, if any, or
a new title insurance policy for the benefit of the Operating Partnership (or a Subsidiary of the Operating Partnership) in the same amount as the lenders title insurance policy required to be obtained under the CyrusOne Credit Agreement.

Section 5.06. EXCLUSIVE REMEDY. In furtherance of the foregoing, the Indemnified Party hereby waives, as of the Closing,
to the fullest extent permitted under applicable Law, any and all rights, claims and causes of action (other than claims of, or causes of action arising from, fraud) it may have against the Indemnifying Party arising under or based upon any federal,
state, local or foreign Law, other than the right to seek indemnity pursuant to this Article V. The foregoing sentence shall not limit the Indemnified Partys right to specific performance or injunctive relief in connection with the breach by
the Indemnifying Party of the provisions of this Agreement.

Section 5.07. TAX TREATMENT. All indemnity payments made
hereunder shall be treated as adjustments to the consideration paid hereunder for United States federal income tax purposes.

ARTICLE VI

COVENANTS AND OTHER AGREEMENTS

Section 6.01. COVENANTS OF THE CONTRIBUTOR. From the date hereof through the Closing, except as otherwise provided for or as contemplated by this Agreement or the other agreements, documents and
instruments contemplated hereby, the Contributor shall not:

(a) sell, transfer or otherwise dispose of all or
any portion of the Contributed Assets; or

(b) mortgage, pledge, hypothecate, encumber (or permit to become
encumbered) all or any portion of the Contributed Assets;

Section 6.02. COMMERCIALLY REASONABLE EFFORTS BY THE OPERATING
PARTNERSHIP AND THE CONTRIBUTOR. Each of the Operating Partnership and the Contributor shall use commercially reasonable efforts and cooperate with each other in (a) promptly determining whether any filings are required to be made or consents,
approvals, waivers, permits or authorizations are required to be obtained (under any applicable Law or regulation or from any Governmental Authority or third party) in connection with the transactions contemplated by this Agreement and the other
Formation Transactions and (b) promptly making any such filings, in furnishing information required in connection therewith and in timely seeking to obtain any such consents, approvals, waivers, permits or authorizations.

Section 6.03. TAX AGREEMENT. The Operating Partnership shall account for any variation between the tax basis of any Contributed
Asset and its fair market value at the time of its contribution to the Operating Partnership under any method approved under Section 704(c) of



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the Code and the applicable regulations as chosen by the general partner of the Operating Partnership.

ARTICLE VII

WAIVERS AND CONSENTS

Effective upon the Closing of the contribution of the Contributed Assets and the exchange of OP Units pursuant to Article I herein, the
Contributor waives and relinquishes all rights and benefits otherwise afforded to the Contributor under any agreement, including, any rights of appraisal or rights of first offer or first refusal, and any and all notice provisions related thereto.

ARTICLE VIII

GENERAL PROVISIONS

Section 8.01. NOTICES. All notices and other
communications under this Agreement shall be in writing and shall be deemed given (a) when delivered personally, (b) five Business Days after being mailed by certified mail, return receipt requested and postage prepaid, (c) one
Business Day after being sent by a nationally recognized overnight courier or (d) when transmitted by facsimile or electronic mail if confirmed within 24 hours thereafter by a signed original sent in the manner provided in clause (a),
(b) or (c) to the parties at the following addresses (or at such other address for a party as shall be specified by notice from such party):

if to the Operating Partnership to:

c/o CyrusOne Inc.

1649 West Frankford Road

Carrollton, Texas 75007

Facsimile: 713-965-0106

Email: customerservice@cyrusone.com

Attention: General Counsel

if to the Contributor, to:

c/o Cincinnati Bell Inc.

221 East Fourth Street

Cincinnati, Ohio 45202

Facsimile: 513-721-7358

Email: christopher.wilson@cinbell.com

Attention: General Counsel

Section 8.02. DEFINITIONS. For purposes of this Agreement, the following terms shall have the following meanings.



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(a) Affiliate means, with respect to any Person, a Person
that, directly or indirectly, through one or more intermediaries, controls, is controlled by, or is under common control with the specified Person. For the purposes of this definition, control (including, with correlative meanings, the
terms controlled by and under common control with) as used with respect to any Person, shall mean the possession, directly or indirectly, of the power to direct or cause the direction of the management or policies of such
Person, whether through the ownership of voting securities, by agreement or otherwise.

(b) Business
Day means any day that is not a Saturday, Sunday or legal holiday in the State of New York.

(c)
Code means the Internal Revenue Code of 1986, as amended, together with the rules and regulations promulgated or issued thereunder.

(d) CyrusOne Credit Agreement means the credit agreement by and among the Operating Partnership, as borrower, Deutsche Bank, as administrative agent, certain subsidiaries of the REIT,
as guarantors, and the financial institutions party thereto as lenders, to be entered into prior to or on the Closing Date.

(e) Environmental Law means Laws or Orders of any Governmental Authority relating to pollution or protection of the environment or natural resources (including the generation, use,
storage, management, treatment, transportation, disposal, presence, Release or threatened Release of any Hazardous Material) or occupational health and safety, such as the Clean Air Act, 42 U.S.C. Section 7401 et seq.; the Clean Water
Act, 33 U.S.C. Section 1251 et seq. and the Water Quality Act of 1987; the Federal Insecticide, Fungicide, and Rodenticide Act, 7 U.S.C. Section 136 et seq.; the Marine Protection, Research and Sanctuaries Act, 33 U.S.C.
Section 1401 et seq.; the National Environmental Policy Act, 42 U.S.C. Section 4321 et seq.; the Noise Control Act, 42 U.S.C. Section 4901 et seq.; the Occupational Safety and Health Act, 29 U.S.C.
Section 651 et seq.; the Resource Conservation and Recovery Act, 42 U.S.C. Section 6901 et seq., as amended by the Hazardous and Solid Waste Amendments of 1984; the Safe Drinking Water Act, 42 U.S.C. Section 300f et
seq.; the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), 42 U.S.C. Section 9601 et seq., as amended by the Superfund Amendments and Reauthorization Act, the Emergency Planning and
Community Right-to- Know Act, and Radon Gas and Indoor Air Quality Research Act; the Toxic Substances Control Act, 15 U.S.C. Section 2601 et seq.; the Atomic Energy Act, 42 U.S.C. Section 2011 et seq., and the Nuclear Waste
Policy act of 1982, 42 U.S.C. Section 10101 et seq.

(f) Environmental Permits
means any and all licenses, certificates, permits, directives, requirements, registrations, government approvals, agreements, authorizations, and consents that are required under or are issued pursuant to any Environmental Laws.

(g) Environmental Liability means any Liability, loss, demand, claim or cost, contingent or otherwise
(including any liability for judgments, orders, damages, costs of investigation, remediation or monitoring, medical monitoring, natural resources



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damages, fines, penalties, professional fees or settlements), and relating to, arising under or resulting from (i) any actual or alleged (x) compliance or noncompliance with any
Environmental Law or Governmental Authorization issued thereunder, (y) generation, use, storage, management, treatment, transportation, or disposal of any Hazardous Material or (z) presence, Release or threatened Release of any Hazardous
Material or (ii) any contract, Proceeding or Order pursuant to which Liability, loss, demand, claim or cost is assumed or imposed with respect to any of the foregoing.

(h) Fixtures and Personal Property means all fixtures, furniture, furnishings, apparatus and fittings,
equipment, machinery, appliances, building supplies, tools, and other items of personal property used in connection with the operation or maintenance of the Properties; excluding, however, all fixtures, furniture, furnishings,
apparatus and fittings, equipment, machinery, appliances, building supplies, tools, and other items of personal property owned by tenants, subtenants, guests, invitees, employees, easement holders, service contractors and other Persons who own any
such property located on the Properties.

(i) Governmental Authority means any government or
agency, bureau, board, commission, court, department, official, political subdivision, tribunal or other instrumentality of any government, whether federal, state or local, domestic or foreign.

(j) Governmental Authorizations means all licenses, permits, consents, certificates, exemptions,
registrations, waivers and other authorizations and approvals required to carry on the Business as conducted as of the date of this Agreement, under applicable Laws of any Governmental Authority.

(k) Hazardous Material means any material, substance or waste defined or regulated in relevant form,
quantity or concentration as hazardous or toxic or as a pollutant or contaminant (or words of similar import) pursuant to any Environmental Law, including any petroleum, waste oil or petroleum constituents or by-products.

(l) Law means laws, statutes, rules, regulations, codes, orders, ordinances, judgments, injunctions,
decrees and policies of any Governmental Authority.

(m) Liabilities means any and all
debts, liabilities and obligations, of whatever kind or nature, primary or secondary, direct or indirect, whether accrued or fixed, known or unknown, absolute or contingent, matured or unmatured or determined or determinable.

(n) Liens means all pledges, claims, liens, charges, restrictions, controls, easements, rights of way,
exceptions, reservations, leases, licenses, grants, covenants and conditions, encumbrances and security interests of any kind or nature whatsoever.

(o) Material Adverse Effect means a material adverse effect on the business, financial condition, properties or results of operations of the REIT and its Subsidiaries, taken as a whole.



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(p) Operating Partnership Agreement means the Amended and
Restated Agreement of Limited Partnership of the Operating Partnership dated as of November 20, 2012.

(q)
Order means any order, writ, judgment, injunction, decree, ruling, assessment, stipulation, determination or award entered by or with any court or other Governmental Authority or arbitrator.

(r) Permitted Lien means:

(i) Liens securing Taxes, the payment of which is not delinquent or the payment of which is actively being contested in
good faith by appropriate proceedings diligently pursued;

(ii) Zoning laws and ordinances applicable to the
Properties that are not violated by the existing structures or present uses thereof or the transfer of the Properties;

(iii) Liens imposed by laws, such as carriers, warehousemens and mechanics liens, and other similar liens arising in the ordinary course of business that secure payment of obligations
arising in the ordinary course of business not more than 60 days past due or which are being contested in good faith by appropriate proceedings diligently pursued;

(iv) non-exclusive easements for public utilities and other operational purposes that do not materially interfere with the
current use of the Properties; and

(v) any other liens that do not materially interfere with the current use
or operation of the Properties.

(s) Person means an individual, corporation, partnership,
limited liability company, joint venture, association, trust, unincorporated organization or other entity.

(t)
Proceeding means any action, arbitration, audit, claim, hearing, investigation, litigation or suit (whether civil, commercial, administrative, criminal, investigative or informal) commenced, brought, conducted or heard by or
before, or otherwise involving any Governmental Authority or arbitrator.

(u) Release means
any release, spill, emission, leaking, dumping, injection, pouring, pumping, placing, discarding, abandoning, deposit, disposal, discharge, dispersal, leaching or migration into or through the environment (including ambient air, surface water,
groundwater, land surface or subsurface strata).

(v) Securities Act means the Securities
Act of 1933, as amended, and the rules and regulations promulgated thereunder.



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(w) Service Contracts means the service, equipment,
franchise, operating, management, parking, supply, utility and maintenance agreements relating to any Property.

(x) Subsidiary of any Person means any corporation, partnership, limited liability company, joint
venture, trust or other legal entity of which such Person owns (either directly or through or together with another Subsidiary of such Person) either (i) a general partner, managing member or other similar interest or (ii) (A) 10% or
more of the voting power of the voting capital stock or other equity interests or (B) 10% or more of the outstanding voting capital stock or other voting equity interests of such corporation, partnership, limited liability company, joint
venture, trust or other legal entity.

(y) Tax means all federal, state, local and foreign
income, property, withholding, sales, franchise, employment, excise and other taxes, tariffs or governmental charges of any nature whatsoever, including estimated taxes, together with penalties, interest or additions to Tax with respect thereto.

(z) Tax Return means any return, declaration, report, claim for refund, or information
return or statement related to Taxes, including any schedule or attachment thereto, and including any amendment thereof.

Section 8.03. COUNTERPARTS. This Agreement may be executed in counterparts, all of which shall be considered one and the same
agreement and shall become effective when one or more counterparts have been signed by each party and delivered to each other party.

Section 8.04. ENTIRE AGREEMENT; THIRD-PARTY BENEFICIARIES. This Agreement, including the exhibits and schedules hereto constitute the entire agreement and supersede each prior agreement and
understanding, whether written or oral, among the parties regarding the subject matter of this Agreement. This Agreement is not intended to confer any rights or remedies on any Person other than the parties hereto.

Section 8.05. GOVERNING LAW. This Agreement shall be governed by, and construed in accordance with, the Law of the State of New
York, regardless of any Law that might otherwise govern under applicable principles of conflicts of laws thereof.

Section 8.06. ASSIGNMENT. This Agreement shall be binding upon, and shall be enforceable by and inure to the benefit of, the parties
hereto and their respective heirs, legal representatives, successors and assigns; provided, however, that this Agreement may not be assigned (except by operation of Law) by any party without the prior written consent of the other
party, and any attempted assignment without such consent shall be null and void and of no force and effect, except that each of the Operating Partnership and the Contributor may assign its rights and obligations hereunder to an Affiliate.

Section 8.07. JURISDICTION. Each of the parties hereto irrevocably and unconditionally submits to the exclusive
jurisdiction of (a) any New York State court sitting in the County of New York and (b) the United States District Court for the Southern District of New York, for the purposes of any action, suit or proceeding arising out of this Agreement
or any transaction contemplated hereby (and each agrees that no such action, suit or proceeding



20



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relating to this Agreement shall be brought by it or any of its Affiliates except in such courts). Each of the parties hereto further agrees that, to the fullest extent permitted by applicable
Law, service of any process, summons, notice or document by U.S. registered mail to such persons respective address set forth in Section 8.01 shall be effective service of process for any action, suit or proceeding in New York with
respect to any matters to which it has submitted to jurisdiction as set forth above in the immediately preceding sentence. Nothing in this Agreement will affect the right of any party to this Agreement to serve process in any other manner permitted
by applicable Law. Each of the parties hereto irrevocably and unconditionally waives (and agrees not to plead or claim) any objection to the laying of venue of any action, suit or proceeding arising out of this Agreement or the transactions
contemplated hereby in (i) any New York State court sitting in the County of New York or (ii) the United States District Court for the Southern District of New York, or that any such action, suit or proceeding brought in any such court has
been brought in an inconvenient forum.

Section 8.08. SEVERABILITY. Each provision of this Agreement will be interpreted
so as to be effective and valid under applicable Law, but if any provision is held invalid, illegal or unenforceable under applicable Law in any jurisdiction, then such invalidity, illegality or unenforceability will not affect any other provision,
and this Agreement will be reformed, construed and enforced in such jurisdiction as if such invalid, illegal or unenforceable provision had never been included herein.

Section 8.09. RULES OF CONSTRUCTION.

(a) The parties hereto
agree that they have been represented by counsel during the negotiation, preparation and execution of this Agreement and, therefore, waive the application of any Law, regulation, holding or rule of construction providing that ambiguities in an
agreement or other document will be construed against the party drafting such agreement or document.

(b) The
words hereof, herein and herewith and words of similar import shall, unless otherwise stated, be construed to refer to this Agreement as a whole and not to any particular provision of this Agreement, and article,
section, paragraph, exhibit and schedule references are to the articles, sections, paragraphs, exhibits and schedules of this Agreement unless otherwise specified. Whenever the words include, includes or including
are used in this Agreement, they shall be deemed to be followed by the words without limitation. All terms defined in this Agreement shall have the defined meanings contained herein when used in agreement, document or instrument made or
delivered pursuant hereto unless otherwise defined therein. The definitions contained in this Agreement are applicable to the singular as well as the plural forms of such terms and to the masculine as well as to the feminine and neuter genders of
such terms. Unless explicitly stated otherwise herein, any agreement, document, instrument or statute defined or referred to herein or in any agreement, document or instrument that is referred to herein means such agreement, document, instrument or
statute as from time to time, amended, qualified or supplemented, including (in the case of agreements, documents and instruments) by waiver or consent and (in the case of statutes) by succession of comparable successor statutes and all attachments
thereto and instruments incorporated therein. References to a Person are also to its permitted successors and assigns.



21



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Section 8.10. EQUITABLE REMEDIES. The parties agree that irreparable damage would occur
in the event that any of the provisions of this Agreement were not performed in accordance with their specific terms or were otherwise breached. It is accordingly agreed that each party shall be entitled to an injunction or injunctions to prevent
breaches of this Agreement by the other party hereto and to enforce specifically the terms and provisions hereof in any federal or state court located in New York, this being in addition to any other remedy to which the parties are entitled under
this Agreement or otherwise at law or in equity.

Section 8.11. DESCRIPTIVE HEADINGS. The descriptive headings herein are
inserted for convenience only and are not intended to be part of or to affect the meaning or interpretation of this Agreement.

Section 8.12. NO PERSONAL LIABILITY CONFERRED. This Agreement shall not create or permit any personal liability or obligation on the
part of any officer, director, partner, employee or shareholder of the Operating Partnership or the Contributor.

Section 8.13. AMENDMENT; WAIVER. Any amendment hereto shall be in writing and signed by all parties hereto. No waiver of any of the
provisions of this Agreement shall be valid unless in writing and signed by the party against whom enforcement is sought.

[remainder of page intentionally left blank; signature page follows]



22



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IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be signed by their
respective duly authorized officers or representatives, all as of the date first written above.



CYRUSONE LPBy:

CyrusOne GPSole General PartnerBy:

CyrusOne Inc.Sole Trustee of CyrusOne GPBy:

/s/ Kimberly H. SheehyName:

Kimberly H. SheehyTitle:

Chief Financial Officer and Administrative OfficerCONTRIBUTOR 
DATA CENTERS SOUTH INC.By:

/s/ Christopher J. WilsonName:

Christopher J. WilsonTitle:

Vice President, General Counsel and Secretary




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EXHIBITS

Exhibit A:Properties

Exhibit B:Formation
Transactions

Exhibit C: Other Contributed Assets

Exhibit D:Operating Partnership Subsidiaries

Exhibit E:Operating Partnership Agreement



---

EXHIBIT A

PROPERTIES

Owned Real Property



|                                                          |  |             |  |                 
|--------------------------------------------------------- |  | ----------- |  | ----------------
|Common Name and Address                                   |  | City        |  | State & Zip Code
|Monroe St. Data Center  316 East Monroe Street           |  | South Bend  |  | Indiana 46601   
|Galleria Data Center  4201 Southwest Freeway             |  | Houston     |  | Texas 77027     
|Galleria Data Center  4211 Southwest Freeway             |  | Houston     |  | Texas 77027     
|San Antonio Data Center  9999 Westover Hills Boulevard   |  | San Antonio |  | Texas 78251     
|Houston West I Data Center  5150 Westway Park Boulevard  |  | Houston     |  | Texas 77041     
|Houston West II Data Center  5150 Westway Park Boulevard |  | Houston     |  | Texas 77041     
|Phoenix Continuum Data Center  2335 South Ellis Street   |  | Chandler    |  | Arizona 85286   
|Ellis Gateway Data Center  South Ellis Street            |  | Chandler    |  | Arizona 85286   
|Carrollton Data Center  1649 Frankford Road              |  | Carrollton  |  | Texas 75007     

Leased Real Property



|                                                      |  |            |  |                  |  |                                          |  |                                                                                                                                                                                                                
|----------------------------------------------------- |  | ---------- |  | ---------------- |  | ---------------------------------------- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Common Name and Address                               |  | City       |  | State & Zip Code |  | Landlord/Owner                           |  | Name of Lease                                                                                                                                                                                                  
|Bryan Street Data Center  2323 Bryan Street          |  | Dallas     |  | Texas 75201      |  | Digital  Bryan Street Partnership, L.P. |  | Master Terms and Conditions dated 7/1/2011 between Telx Entities and Cyrus Networks, LLC, and Office Lease dated 10/6/2011 between Digital  Bryan Street Partnership, L.P. and
Cyrus Networks, LLC, as amended
|Lewisville Data Center  2501 South State Highway 121 |  | Lewisville |  | Texas 75067      |  | Digital Lewisville, LLC                  |  | Lease Agreement dated 2/19/2008 between BREOF Convergence LP and Cyrus Networks, LLC, as amended                                                                                                               



---

|                                                          |  |            |  |                |  |                                                  |  |                                                                                                                                                                                                                   
|--------------------------------------------------------- |  | ---------- |  | -------------- |  | ------------------------------------------------ |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Met Center I Data Center  7401 East Ben White Boulevard  |  | Austin     |  | Texas 78741    |  | NNN Met Center 4-9 LP                            |  | Lease Agreement dated March 2009 between NNN Met Center 4-9 LP and Cyrus Networks LLC, as amended                                                                                                                 
|Met Center II Data Center  7101 Metropolis Drive         |  | Austin     |  | Texas 78741    |  | MET CENTER PARTNERS-9, LTD. By Met Center3, Inc. |  | Lease Agreement dated 2/28/2011 between Met Centers Partners-9, LTD. and Cyrus Networks, LLC, as amended                                                                                                          
|Galleria Data Center  4201 Southwest Freeway (land only) |  | Houston    |  | Texas 77027    |  | Tamborella Real Estate Trust I                   |  | Lease Agreement dated 11/1/1966 between Bertha Jewell Tamborella and Lynne Tamborella, and Albert H. Herzstein, as amended                                                                                        
|Marsh Lane Data Center  2440 Marsh Lane                  |  | Carrollton |  | Texas 75006    |  | Horizon Data Center Solutions, LLC               |  | Master Service Agreement dated 7/15/2008 between Horizon Data Center Solutions, LLC and Cyrus Networks, LLC, as amended                                                                                           
|Midway Data Center  4025 Midway Road                     |  | Carrollton |  | Texas 75093    |  | Digital Midway, L.P.                             |  | Master Service Agreement dated 7/15/2008 between Horizon Data Center Solutions LLC and Cyrus Networks, LLC, and Office Lease dated March 11, 2011 between Digital Midway, L.P. and
Cyrus Networks, LLC, as amended
|Greenspoint Data Center  12085 North Freeway             |  | Houston    |  | Texas 77060    |  | WXIII/HOU Yale Real Estate Limited Partnership   |  | Sublease Agreement dated 12/21/2004 between US Oncology Corporate, Inc. and Cyrus Networks, LLC, as amended                                                                                                       
|Lombard Data Center  1850 Springer Street                |  | Lombard    |  | Illinois 60148 |  | Chicago Title Land Trust Company                 |  | Lease dated 9/28/2007 between Chicago Title Land Trust Company and GramTel Midwest, Inc. as amended                                                                                                               
|Blackthorn Data Center  3919 Crescent Circle             |  | South Bend |  | Indiana 46628  |  | Crescent Michiana Properties III, LLC            |  | Facility Lease dated 3/6/2008 between Crescent Michiana Properties III, LLC and GramTel, Inc., as amended                                                                                                         



---

EXHIBIT B-1

FORMATION TRANSACTIONS



|1. | Data Centers South Inc. (Data Centers South) is formed as a Delaware corporation.
|-- | -----------------------------------------------------------------------------------



|2. | Data Center Investments Inc. (Data Center Investments) is formed as a Delaware corporation.
|-- | ---------------------------------------------------------------------------------------------



|3. | Data Centers South Holdings LLC (DCS Holdco) is formed as a Delaware limited liability company.
|-- | -------------------------------------------------------------------------------------------------



|4. | Data Center Investments Holdco LLC (DCI Holdco) is formed as a Delaware limited liability company.
|-- | ----------------------------------------------------------------------------------------------------



|5. | GramTel Inc., a Virginia corporation, merges with and into CyrusOne Inc., a Delaware corporation (CyrusOne Inc.), with CyrusOne Inc. surviving.
|-- | -------------------------------------------------------------------------------------------------------------------------------------------------



|6. | Cincinnati Bell Technology Solutions Inc., a Delaware corporation (CBTS), transfers its long haul fiber network assets and data center asset and
assigns its interests in leases associated with its data center business to CyrusOne Inc. in exchange for the constructive issuance of CyrusOne Inc. shares and CyrusOne Inc.s assumption of liabilities related to such assets and leases.
|-- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|7. | Cincinnati Bell Telephone Company LLC, an Ohio limited liability company (CBT), sells its data center building located at 229 West Seventh Street to
CyrusOne Inc. for $18 million payable in the form of a promissory note from CyrusOne Inc. to CBT.
|-- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|8. | CBTS contributes the stock of CyrusOne Inc. to Data Center Investments in exchange for the stock of Data Center Investments.
|-- | ----------------------------------------------------------------------------------------------------------------------------



|9. | CyrusOne Inc. converts to CyrusOne LLC, a limited liability company (CyrusOne LLC), pursuant to Delaware law.
|-- | ---------------------------------------------------------------------------------------------------------------



|10. | CyrusOne LLC transfers its high-basis assets to Data Centers South in exchange for the transfer of Data Centers South stock to CyrusOne LLC and the assumption of
certain liabilities of CyrusOne LLC (including a portion of the intercompany debt owed by CyrusOne LLC to CBTS and all of the intercompany debt owed by CyrusOne LLC to Cincinnati Bell Inc., an Ohio corporation (CBI)).
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|11. | Data Center Investments assumes remaining portion of intercompany debt owed by CyrusOne LLC to CBTS.
|--- | ----------------------------------------------------------------------------------------------------



|12. | CyrusOne LLC distributes the stock of Data Centers South to Data Center Investments.
|--- | ------------------------------------------------------------------------------------



---

|13. | Data Center Investments transfers interests in CyrusOne LLC to CyrusOne LP, a Maryland limited partnership (CyrusOne LP), in exchange for CyrusOne LP
limited partnership interests.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|14. | Data Centers South transfers its high-basis assets to CyrusOne LP in exchange for CyrusOne LP limited partnership interests and CyrusOne LPs assumption of Data
Center Investments liabilities.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|15. | CyrusOne LP transfers its high-basis assets to CyrusOne LLC.
|--- | ------------------------------------------------------------



|16. | Data Center Investments transfers its limited partnership interests in CyrusOne LP to DCI Holdco.
|--- | -------------------------------------------------------------------------------------------------



|17. | Data Centers South transfers its limited partnership interests in CyrusOne LP to DCS Holdco.
|--- | --------------------------------------------------------------------------------------------



|18. | CBI, CBTS, CBT, CyrusOne LLC and CyrusOne LP enter into intercompany agreements.
|--- | --------------------------------------------------------------------------------



---

EXHIBIT B-2

FORMATION TRANSACTIONS



|1. | Data Centers South Inc. (Data Centers South) is formed as a Delaware corporation.
|-- | -----------------------------------------------------------------------------------



|2. | Data Center Investments Inc. (Data Center Investments) is formed as a Delaware corporation.
|-- | ---------------------------------------------------------------------------------------------



|3. | Data Centers South Holdings LLC (DCS Holdco) is formed as a Delaware limited liability company.
|-- | -------------------------------------------------------------------------------------------------



|4. | Data Center Investments Holdco LLC (DCI Holdco) is formed as a Delaware limited liability company.
|-- | ----------------------------------------------------------------------------------------------------



|5. | GramTel Inc., a Virginia corporation, merges with and into CyrusOne Inc., a Delaware corporation (CyrusOne Inc.), with CyrusOne Inc. surviving.
|-- | -------------------------------------------------------------------------------------------------------------------------------------------------



|6. | Cincinnati Bell Technology Solutions Inc., a Delaware corporation (CBTS), transfers its long haul fiber network assets and data center asset and
assigns its interests in leases associated with its data center business to CyrusOne Inc. in exchange for the constructive issuance of CyrusOne Inc. shares and CyrusOne Inc.s assumption of liabilities related to such assets and leases.
|-- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|7. | Cincinnati Bell Telephone Company LLC, an Ohio limited liability company (CBT), sells its data center building located at 229 West Seventh Street to
CyrusOne Inc. for $18 million payable in the form of a promissory note from CyrusOne Inc. to CBT.
|-- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|8. | CBTS contributes the stock of CyrusOne Inc. to Data Center Investments in exchange for the stock of Data Center Investments.
|-- | ----------------------------------------------------------------------------------------------------------------------------



|9. | CyrusOne Inc. converts to CyrusOne LLC, a limited liability company (CyrusOne LLC), pursuant to Delaware law.
|-- | ---------------------------------------------------------------------------------------------------------------



|10. | CyrusOne LLC transfers its high-basis assets to Data Centers South in exchange for the transfer of Data Centers South stock to CyrusOne LLC and the assumption of
certain liabilities of CyrusOne LLC (including a portion of the intercompany debt owed by CyrusOne LLC to CBTS and all of the intercompany debt owed by CyrusOne LLC to Cincinnati Bell Inc., an Ohio corporation (CBI)).
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|11. | Data Center Investments assumes remaining portion of intercompany debt owed by CyrusOne LLC to CBTS.
|--- | ----------------------------------------------------------------------------------------------------



|12. | CyrusOne LLC distributes the stock of Data Centers South to Data Center Investments.
|--- | ------------------------------------------------------------------------------------



---

|13. | Data Center Investments transfers interests in CyrusOne LLC to CyrusOne LP, a Maryland limited partnership (CyrusOne LP), in exchange for CyrusOne LP
limited partnership interests.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



---

EXHIBIT C-1

ASSETS



|1. | All accounts receivable, prepaid expenses, deferred transaction costs, and other current assets of the Contributor which are associated with the Properties.
|-- | ------------------------------------------------------------------------------------------------------------------------------------------------------------



|2. | All assets associated with that certain Texas long-haul fiber route from Houston to Austin to San Antonio, including, but not limited to (i) seven (7) empty
conduits, (ii) rights to those certain 68 fibers granted pursuant to that certain Dark Fiber IRU Agreement dated February 5, 2004 by and between Broadwing Communications LLC and BCSI Inc. and (iii) all rights and interests related
thereto.
|-- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|3. | All construction in process and construction escrows related to the Properties.
|-- | -------------------------------------------------------------------------------



|4. | All transferrable licenses, permits, consents, certificates, exemptions, registrations, waivers and other authorizations and approvals held to operate the Properties.
|-- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------



|5. | All deferred sales commissions, deferred expenses, deferred installation costs, unbilled revenue and deposits associated with the Properties.
|-- | ---------------------------------------------------------------------------------------------------------------------------------------------



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EXHIBIT C-2

ASSUMED AGREEMENTS



|1. | All CyrusOne LLC (or CyrusOne LLC subsidiary) leases, licenses, subleases, tenancies, possession agreement or occupancy agreements with respect to the leased Properties
identified on Exhibit A.
|-- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|2. | All tenant leases, licenses, subleases, tenancies, possession agreement or occupancy agreements with respect to the owned and leased Properties.
|-- | ------------------------------------------------------------------------------------------------------------------------------------------------



|3. | All service, equipment, franchise, operating, management, parking, supply, utility and maintenance agreements relating to any Property.
|-- | ---------------------------------------------------------------------------------------------------------------------------------------



|4. | All other agreements to which CyrusOne LLC is a party relating to the owned and leased Properties.
|-- | --------------------------------------------------------------------------------------------------



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EXHIBIT D

OPERATING PARTNERSHIP SUBSIDIARIES



|1. | CyrusOne Finance Corp.  100%
|-- | -----------------------------



---

EXHIBIT E

OPERATING PARTNERSHIP AGREEMENT



---

Schedule 3.03

Consents and Approvals

None



---

Schedule 4.04(a)

Ownership of the Properties  owned real property

None



---

Schedule 4.04(b)

Ownership of the Properties  leased real property

None



---

Schedule 4.11

Compliance with Laws

None



---

Schedule 4.13

Licenses and Permits

None



---

Schedule 4.14

Environmental Compliance

None



---

Schedule 4.15

Material Customer Leases

None



---

Schedule 4.16

Zoning

None