CubeSmart Notation of Guarantee for 4.375% Senior Notes Due 2023

Exhibit 4.3

NOTATION OF GUARANTEE

For value received, the Guarantor (which term includes any successor Person under the Indenture hereinafter referred to) has unconditionally guaranteed to the extent set forth in, and subject to the provisions of, an indenture dated as of September 16, 2011 (the “Base Indenture “), as amended by the Second Supplemental Indenture, dated as of December 17, 2013 (the “Second Supplemental Indenture “ and, together with the Base Indenture and as the Base Indenture and the Second Supplemental Indenture may be further amended and supplemented from time to time, the “Indenture “) among CubeSmart, L.P. (the “Issuer”), the Guarantor named therein and U.S. Bank National Association, as trustee (the “Trustee “), providing for the issuance of 4.375% Senior Notes due 2023, the due and punctual payment of the principal of and interest on the Notes to which this notation is affixed and all other amounts due and payable under the Indenture and the Notes to which this notation is affixed by the Issuer.

The obligations of such Guarantor to the Holders of Notes to which this notation is affixed and to the Trustee pursuant to the Guarantee and the Indenture are expressly set forth in Article Fourteen of the Indenture and reference is hereby made to the Indenture for the precise terms of the Guarantee.

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