Exhibit 3.18

State of Delaware

Secretary of State

Division of Corporations

Delivered 05:03 PM 07/11/2007

FILED 05:03 PM 07/11/2007

SRV 070803890 - 4387417 FILE

CERTIFICATE OF FORMATION

OF

QUALITY TECHNOLOGY SERVICES LENEXA, LLC

This Certificate of Formation of Quality Technology Services Lenexa, LLC (the “LLC”), dated July 11, 2007, has been duly executed and is being filed by Chad L. Williams, as an authorized person, to form a limited liability company under the Delaware Limited Liability Company Act (6 Del. C. § 18-101, et seq.).

FIRST. The name of the limited liability company formed hereby is Quality Technology Services Lenexa, LLC.

SECOND. The address of the registered office of the LLC in the State of Delaware is c/o Capitol Services, Inc., 615 South DuPont Highway, Dover, Kent County, Delaware 19901.

THIRD. The name and address of the registered agent for service of process on the LLC in the State of Delaware ace Capitol Services, Inc, 615 South DuPont Highway, Dover, Kent County, Delaware 19901.

IN WITNESS WHEREOF, the undersigned has executed this Certificate of Formation as of the date first above written.

/s/ Chad L. Williams

Name: Chad L. Williams

Authorized Person