Exhibit 10.3

Confidential material has been omitted and filed separately with the Commission

RENTAL AGREEMENT

as lessee (hereinafter referred to as ‘the Lessee’).

The aforementioned Parties herewith wish to conclude the following:

Section 1

RENTED PROPERTY

Section 2

TERM OF RENTAL AGREEMENT

The Parties shall meet six months prior to termination of the Rental Agreement in order to discuss a possible extension of the Rental Agreement. Furthermore, the Lessee is herewith granted the right of first refusal with regard to the rental of the property.

Section 3

PREMATURE RESCISSION OF THE RENTAL AGREEMENT

Section 4

RENT AND OPERATING EXPENSES

The agreed monthly rent excl. proportional operating expenses is:

***

plus the legally applicable amount of VAT; this sum is payable monthly in advance after submission of invoice on the first day of each month.

Currently operating expenses for the hall area are ATS 12.13 / m^² + 20% VAT per month and for the office area ATS 13.97 / m^² + 20% VAT per month. The stated operating expenses for the office area include water consumption costs.

For the months of January to April 2000 the following shall be agreed: The rent for January shall be 20%, for February 40%, for March 60%, for April 80% and as of May (2000) onwards 100% of the agreed rent. Operating expenses shall be payable in full as of the commencement of the Rental Agreement.

Section 5

MAINTENANCE AND REPAIR OBLIGATIONS

Section 6

STRUCTURAL CHANGES

Section 7

SUBLEASING AND OTHER USE

Section 8

RETURN OF THE RENTED PROPERTY

Section 9

COSTS AND CHARGES

Section 10

GUARANTEES

Section 11

MISCELLANEOUS

Vienna, 04.02.2000

Annex 1

The work listed in section 6 point 5, includes the following supply equipment and this work is to be carried out in agreement with the Lessee.

Description of works:

1. Energy supply

2. Disassembly of overhead cranes without craneways.

3. Cleaning and repair of hall floors.

All additional work will be carried out by InterXion or on their behalf at the cost of InterXion.

Annex 2

Production areas

Office and social areas

Confidential material has been omitted and filed separately with the Commission

Re: Supplement to the Floridsdorf Technology Park Lease

Dear Sir,

With regard to the above matter, we would like to inform you that we have been in contact with Univ. Doz. DDr Mag. Ludwig Bittner, the counsel representing S-Invest Beteiligungsgesellschaft mbH and ELIN EBG Traction GmbH.

Acting upon the instructions and on behalf of InterXion Österreich GmbH, we have furthermore agreed with him verbally to make the following amendments or supplements to the existing Lease Agreement of 4 February 2000 between InterXion Österreich GmbH (hereinafter the “Lessee”) and S-Invest mbH (hereinafter the “Lessor”) regarding Building 50 in the Floridsdorf Technology Park, of which the registered owner is ELIN EBG Traction GmbH (hereinafter the “Property Owner”):

“ad. § 2) Leased premises

As of 1 April 2007, the Leased Premises have been enlarged by the leasing of additional floor space

of approx. 136 m² in Building 51

and

of approx. 196 m² in Building 50.

The additional areas in Buildings 50 and 51 are shown in red in the enclosed floor plans.

ad. § 2) Term of the Lease

The term of the Lease Agreement of 4 February 2000, as amended in accordance with the Addenda of 24 May 2000, 30 January 2001, and 14 May 2001 respectively, has, by mutual agreement, been extended for an additional five years. The Lease shall terminate on 31 December 2019 without need for notice.

At the same time, the Lessor grants the Lessee a non-recurring option to make one further three-year extension to the Lease Agreement’s term. Should the Lessee choose to exercise this option, the Lease Agreement shall be extended under the same conditions for a period of three years and shall automatically terminate on expiry of the extended period without need for notice or specific declaration.

This option may be exercised by the Lessee no sooner than 18 months and no later than 12 months prior to the expiry of the term of the Lease agreed in accordance with the above point. The exercise of the option to extend the Lease shall occur by registered mail, with the date of receipt by the Lessor or its representative being decisive in determining compliance with deadlines. This renewal option is not transferable and can naturally only be exercised and used by the Lessee as long as the existing Lease Agreement is in effect.

The Parties shall enter into negotiations concerning a possible extension of the Lease beyond 31 December 2022 as far in advance as possible. In this respect, the Lessor is required to inform the Lessee no later than 20 June 2021 if the former intends to continue leasing the Leased Premises beyond 31 December 2022 or else to proceed in another manner (e.g. demolition, sale, etc.). The Lessor is completely free to make this decision as it deems fit. Should the Lessor neglect to provide such notification by the specified date, it shall be assumed that the Lessor does not intend to continue leasing the property beyond 31 December 2022. In the case that the Lessor decides to continue leasing the Leased Premises (and only in this case), the Lessee is entitled, on expiry of the above-mentioned non-recurrent three-year extension, to exercise an additional non-recurring option to extend the Lease Agreement for a further three-year period (i.e. until 31 December 2025). Should the Lessee choose to exercise this second option, the Lease Agreement shall be extended under the same conditions for a period of three years and shall automatically terminate on expiry of the extended period without need for notice or specific declaration. This second renewal option may be exercised under the above

conditions by the Lessee no sooner than 18 months and no later than 12 months prior to the expiry of the term of the Lease agreed in accordance with the above point. Moreover, the provisions of the preceding paragraph apply mutatis mutandis.

The Lessor waives the right to terminate the Lease in order to use the property for its own purposes (of whatever nature) or under the provisions of § 30 Para 2 Z 15 of the Austrian Landlord and Tenant Act (Mietrechtsgesetz).

ad.) § 4) Rent and Operating Costs

ad 1. Rent:

On account of the additional leased space of approximately 332 m² (at          ***          per m²), the monthly rent is increased as of 1 January 2007 by          ***         to a total of         ***         plus operating costs and VAT.

Miscellaneous:

In addition to the provisions of the Lease Agreement of 4 Februar.2000, it was agreed that the Property Owner is required to make this Lease Agreement binding on any legal successor in ownership of the property and to impose a corresponding requirement to make the Lease Agreement binding on any subsequent legal successor. In the event of a breach of this obligation, the Lessor and the Property Owner shall fully indemnify the Lessee and hold it harmless from third-party claims.

All other provisions of the Lease Agreement of 2 February 2000 and any addenda or supplementary agreements remain valid without change.”

A further agreement has been reached with the legal representative of the other contracting party to the effect that, if this oral agreement gives rise to any contractual fees (due to formulation of any equivalent written document that may be required), these costs are to be entirely borne by the Lessee and fully reimbursed to the Lessor.

Finally, it has been agreed with the other contracting party that, on our part, the above agreements have also been completed in the name of InterXion Holding NV, as a result of which the obligations of the original Lease Agreement of 2 February 2000, which have been assumed by InterXion Holding NV, shall apply to the extended term of the agreement.

cc: Univ. Doz. Mag. DDr. Ludwig Bittner