Exhibit 21.1

Subsidiary	Jurisdiction of Organization
186 JAMAICA AVE, LLC	Delaware
2301 TILLOTSON AVE, LLC	Delaware
251 JAMAICA AVE, LLC	Delaware
5 Old Lancaster Associates, LLC	Pennsylvania
CONSHOHOCKEN GP II, LLC	Delaware
CS SNL AVE M, LLC	Delaware
CS SNL NEW YORK AVE, LLC	Delaware
CS SNL OPERATING COMPANY, LLC	Delaware
CS VENTURE I, LLC	Delaware
CUBE HHF Limited Partnership	Delaware
CUBE HHF TRS, LLC	Delaware
CUBE VENTURE GP, LLC	Delaware
CubeSmart	Maryland
CubeSmart Alexandria, LLC	Delaware
CubeSmart Allen, LLC	Delaware
CubeSmart Asset Management, LLC	Delaware
CUBESMART BARTOW, LLC	Delaware
CUBESMART BOSTON ROAD, LLC	Delaware
CUBESMART CLINTON, LLC	Delaware
CUBESMART CYPRESS, LLC	Delaware
CUBESMART EAST 135TH, LLC	Delaware
CubeSmart Leesbrug, LLC	Delaware
CubeSmart Management, LLC	Delaware
CUBESMART NEW ROCHELLE, LLC	Delaware
CUBESMART PINE LAKES, LLC	Delaware
CUBESMART SOUTHERN BLVD, LLC	Delaware
CUBESMART SWISS AVE, LLC	Delaware
CUBESMART TEMPLE HILLS, LLC	Delaware
CUBESMART TIMONIUM BORROWER, LLC	Delaware
CubeSmart Timonium, LLC	Delaware
CubeSmart TRS, Inc.	Ohio
CUBESMART WILTON, LLC	Delaware
CubeSmart, L.P.	Delaware
EAST COAST GP, LLC	Delaware
EAST COAST STORAGE PARTNERS, L.P.	Delaware
FREEHOLD MT, LLC	Delaware
LANGHORNE GP II, LLC	Delaware
Lantana Property Owner’s Association, Inc.	Florida
MONTGOMERYVILLE GP II, LLC	Delaware
Old Lancaster Venture, L.P.	Pennsylvania
R STREET STORAGE ASSOCIATES, LLC	Maryland
SHIRLINGTON RD, LLC	Delaware
SOMERSET MT, LLC	Delaware
STORAGE PARTNERS OF CONSHOHOCKEN, L.P.	Delaware
Storage Partners of Freehold II, LLC	Delaware
Storage Partners of Langhorne II, LP	Delaware
STORAGE PARTNERS OF MONTGOMERYVILLE, L.P.	Delaware
STORAGE PARTNERS OF SOMERSET, LLC	Delaware
Storage Partners of West Hempstead II, LLC	Delaware
UNITED-HSRE I, L.P.	Delaware
USI Overseas Development Holding, LLC	Delaware
USI Overseas Development LLC	Delaware

USIFB LLP	London
USIFB LP	London
USIFB Property Investment No. 1 Limited	London
USIFB Property Investment No. 2 Limited	London
USIFB Storage Company Limited	London
U-Store-It Development LLC	Delaware
U-Store-It Trust Luxembourg S.ar.l.	Luxembourg
Wider Reach, LLC	Delaware
YSI Burke Lake, LLC	Delaware
YSI HART TRS, INC	Delaware
YSI I LLC	Delaware
YSI II LLC	Delaware
YSI VENTURE GP LLC	Delaware
YSI VENTURE LP LLC	Delaware
YSI X GP LLC	Delaware
YSI X LP	Delaware
YSI X LP LLC	Delaware
YSI XV LLC	Delaware
YSI XX GP LLC	Delaware
YSI XX LP	Delaware
YSI XX LP LLC	Delaware
YSI XXX LLC	Delaware
YSI XXXI, LLC	Delaware
YSI XXXIII, LLC	Delaware
YSI XXXIIIA, LLC	Delaware
YSI XXXV, LLC	Delaware
YSI XXXVII, LLC	Delaware
YSI-Hart Limited Partnership	Delaware