Form: 10-K

Annual report [Section 13 and 15(d), not S-K Item 405]

February 26, 2026

Exhibit 21.1

Subsidiaries
Subsidiary
d/b/a
Jurisdiction
2016 JV MHC, LLCDelaware
2016 JV Property Holdings, LLCDelaware
All Stor Asheville, LLCDelaware
All Stor Carolina Beach, LLCDelaware
All Stor Durham, LLCDelaware
All Stor Indian Trail, LLCDelaware
All Stor MHDelaware
All Stor NC, LLCDelaware
All Stor Prospect, LLCDelaware
All Stor Swansboro II, LLCDelaware
All Stor Swansboro, LLCDelaware
American Mini Storage-San Antonio, LLCDelaware
Banning Storage, LLCStoreMore Self StorageNevada
Bend-Eugene Storage, LLCOregon
Big Bend Xpress Holdings, LLCFlorida
Big Bend Xpress Storage, LLCFlorida
Bishop Road Mini Storage, LLCWashington
Broadway Storage Solutions, L.L.C.Arizona
Buck Investors, LPPennsylvania
Bullhead Freedom Storage, L.L.C.StoreMore Self Storage; Freedom StorageArizona
Carlsbad Airport Self Storage, LPCalifornia
Chelmsford, LLCDelaware
Colton Campus Pt., L.P.California
Colton CV L.P.California
Colton Duarte, L.P.California
Colton Encinitas, L.P.California
Colton Paramount, L.P. California
Colton Plano, L.P.California
Corona Universal Self Storage, a California Limited PartnershipCalifornia
Cunningham Properties, LLC Kentucky
Eagle Bow Wakefield, LLCEagle StorageDelaware
Eastpointe Storage, LLCDelaware
Extra Closet Leesburg, LLCFlorida
Extra Closet Mini Storage, LLCFlorida
Fletcher Heights Storage Solutions, L.L.C.Arizona
Fontana Universal Self Storage, a California Limited PartnershipCalifornia
Forest Grove Mini Storage, LLCOregon
GAK, LLCCypress Mini StorageCalifornia
Great American Storage Partners, LLCGreat America StorageDelaware
Gresham Storage, LLCOregon
GSC Indio Ltd.California
GSC Irvine/Main LPCalifornia
GSC Mesquite, LPCalifornia
Hesperia Universal Self Storage, a California Limited PartnershipCalifornia



Hide Away SPE, LLCDelaware
Hide Away Storage Holdings, LLCDelaware
Hide Away Transportation #1, LLCDelaware
Highway 97 Mini Storage, LLCOregon
Highway 99 Mini Storage, LLCOregon
ICDC II, LLCOregon
IRE NSA JV I Member, LLCDelaware
iStorage JV Bridgewater, LLCDelaware
iStorage JV DuPont Highway, LLCDelaware
iStorage JV Hickman Road, LLCDelaware
iStorage JV Houston Holdings, LLCDelaware
iStorage JV Houston, LLCDelaware
iStorage JV II Bellport, LLCDelaware
iStorage JV II Lodi, LLCDelaware
iStorage JV II OKC Holdings, LLCDelaware
iStorage JV II RGV Holdings 1, LPDelaware
iStorage JV II RGV Holdings 1, LPTexas
iStorage JV II RGV Holdings 2, LPDelaware
iStorage JV II RGV Holdings GP, LLCDelaware
iStorage JV II, LLCDelaware
iStorage JV Rancho Cordova, LLCDelaware
iStorage JV Ridge Road, LLCDelaware
iStorage JV Sunrise Monier, LLCDelaware
iStorage JV, LLCDelaware
iStorage Mezz, LLCDelaware
iStorage PO, LLCDelaware
iStorage TN JV II, LLCDelaware
iStorage TRS JV, LLCDelaware
Jeffersonville Storage, LLCIndiana
Keepers Storage, LLCWashington
Lewisville Storage LLCWashington
Loma Linda Universal Self Storage, a California Limited PartnershipCalifornia
Madison Brookhaven, LLCDelaware
Madison Eagle Drive, LLCDelaware
Maizeland Storage, LLCColorado
Mini I, LimitedCalifornia
Mini Storage of Deland, LLCFlorida
Moove In Partners - Centerville, LPPennsylvania
Moove-in of Manheim, LLCWyoming
Moove-In of New Jersey, LLCWyoming
MooveIn Partners-Lancaster, L.P.Pennsylvania
Moovein Properties II, LLCWyoming
Moovein, LLCWyoming
National Storage Affiliates Management Company, LLCDelaware
National Storage Affiliates TrustMaryland
National Storage Insurance Solutions, Inc.Utah
Northwest II Chief Manager, LLCDelaware
NSA 110 V JV PO, LLCSecurCare Self Storage 8511Delaware



NSA 110 V JV TRS, LLCDelaware
NSA 110 V JV TX PO, LLCDelaware
NSA 110 V JV, LLCDelaware
NSA 110 V Member, LLCDelaware
NSA 110 V Non-Member Manager, LLCDelaware
NSA 110 V TN JV PO, LLCDelaware
NSA 110 V TN JV TRS, LLCDelaware
NSA 110 V TN JV, LLCDelaware
NSA Acquisition Holdings, LLCDelaware
NSA All Stor Chief Manager, LLCDelaware
NSA All Stor, LLCDelaware
NSA Americor Holdings, LLCDelaware
NSA BL PM, LLCDelaware
NSA Buck GP, LLCDelaware
NSA BV DR,LLCDelaware
NSA Canal Road GP, LLCDelaware
NSA Centerville GP, LLCDelaware
NSA Colton DR GP, LLCA-1 Self Storage; StorAmerica Arcadia; El Camino Self Storage; All American Self StorageDelaware
NSA Colton DR, LLCPlano Self Storage; Crown Valley Self Storage; Paramount Self Storage; StorAmerica DuarteDelaware
NSA Fanning Springs, LLCDelaware
NSA GSC DR GP, LLCIrvine Self StorageDelaware
NSA GSC DR, LLCStorAmerica Palm Springs I; Carlsbad Airport Self Storage; StorAmerica IndioDelaware
NSA HHF JV Property Holdings, LLCDelware
NSA HHF JV Tennessee Holdco, LLCDelaware
NSA HHF JV, LLCDelaware
NSA HHF Member, LLCDelaware
NSA HHF Non-Member Manager, LLCDelaware
NSA HHF TRS, LLCDelaware
NSA Holding Company I, LLCDelaware
NSA Holding Company II, LLCDelaware
NSA Hollister, LLCDelaware
NSA Irvine DR, LLCDelaware
NSA iStorage II Member, LLCDelaware
NSA iStorage II Non-Member, LLCDelaware
NSA iStorage II TRS Member, LLCDelaware
NSA iStorage Member, LLCDelaware
NSA iStorage TN II Member, LLCDelaware
NSA iStorage TRS Member, LLCDelaware
NSA Lancaster GP, LLCDelaware
NSA MGMT CO GP, LLCDelaware
NSA Northwest CMBS II, LLCDelaware
NSA Northwest Holdings II, LLCOld Mill Self Storage; AllStar Storage; A-1 Westside StorageDelaware
NSA Northwest Holdings, LLCDelaware
NSA OP, LPDelaware
NSA OV PM, LLCDelaware
NSA PM Holding Company, LLCDelaware



NSA PM, LLCDelaware
NSA Property Holdings, LLCDelaware
NSA Puerto Rico, LLCDelaware
NSA SecurCare CMBS I, LLCDelaware
NSA SecurCare Holdings, LLCDelaware
NSA Security Storage, LLCDelaware
NSA SS PM, LLCDelaware
NSA Storage Solutions, LLCDelaware
NSA TRS, LLCDelaware
NSA Tustin Gateway GP, LLCDelaware
NSA Universal DR, LLCDelaware
NSA Villages Storage GP, LLCDelaware
NSA-C Holdings, LLCStorAmerica Hawaiian Gardens; StorAmerica Victorville-2; Statewide Storage; Country Club Self StorageDelaware
NSA-Colton Holdings, LLCDelaware
NSA-G Holdings, LLCStorAmerica Montclair; Allsafe Freeway Storage; Leave It/Lock It Self Storage; StorAmerica Ontario; StorAmerica Palm Desert; StorAmerica Oceanside; StorAmerica VictorvilleDelaware
NSA-GSC Colton Holdings, LLCDelaware
NSA-GSC Holdings, LLCDelaware
NSA-Northwest II, LLCDelaware
NSA-Optivest Acquisition Holdings, LLCStoreMore Self Storage; Fort Mohave StorageDelaware
NSA-Optivest, LLCDelaware
NSA-SecurCare Acquisition Holdings, LLCDelaware
NSA-SecurCare, LLCDelaware
NWSS Stor Rite LLCOregon
Oklahoma Self Storage GP, LLCDelaware
Oklahoma Self Storage LPSecurCare Self StorageColorado
PCB South, LLCFlorida
Personal Mini Storage Dyer, LLCFlorida
Personal Mini Storage Forest City Rd., LLCFlorida
Personal Mini Storage Forsyth, LLCFlorida
Personal Mini Storage Kissimmee, LLCFlorida
Personal MIni Storage Piedmont, LLCFlorida
Personal MIni Storage Spring Garden, LLCFlorida
Personal MIni Storage Vine, LLCFlorida
Personal MIni Storage West, LLCFlorida
Personal MIni Storage Winter Garden, LLCFlorida
Personal Mini Storage-Edgewater, LLCFlorida
Personal Mini Storage-Orange City, LLCFlorida
Rev Smart, L.P.Florida
Safegard Mini Storage, LLCOregon
SAG Arcadia, LPCalifornia
SAP-II YSI #1,LLCDelaware
SecurCare American Portfolio, LLCDelaware
SecurCare American Properties II, LLCDelaware
SecurCare Colorado III, LLCSecurCare Self StorageDelaware
SecurCare Fayetteville I, LLCDelaware



SecurCare Management, LLCColorado
SecurCare Moreno Valley, LLCDelaware
SecurCare Moveit McAllen, LLCMove It Self StorageDelaware
SecurCare Oklahoma I, LLCSecurCare Self StorageDelaware
SecurCare Oklahoma II, LLCSecurCare Self StorageDelaware
SecurCare Operating Company, LLCDelaware
SecurCare Portfolio Holdings, LLCDelaware
SecurCare Properties I, LLCSecurCare Self StorageDelaware
SecurCare Properties II R, LLCSecurCare Self StorageDelaware
SecurCare Properties II, LLCSecurCare Self StorageDelaware
SecurCare Value Properties R, LLCSecurCare Self StorageDelaware
Series Americor Insurance Company, a series of Endeavor Assurance Company, LLCDelaware
Shreve Storage Equities, L.L.C.Louisiana
Simply Storage Clarksville, LLCDelaware
Simply Storage Franklin, LLCDelaware
Simply Storage Gallatin, LLCDelaware
Simply Storage Harrah Drive, LLCDelaware
Simply Storage Hendersonville, LLCDelaware
Simply Storage Hermitage, LLCDelaware
Simply Storage Maddox Simpson Parkway, LLCDelaware
Simply Storage Mezz, LLCDelaware
Simply Storage Partners REIT II LLCDelaware
Simply Storage Quarry Loop Road, LLCDelaware
Simply Storage White House, LLCDelaware
Southeast Portfolio Holding Company, LLCDelaware
Southeast Portfolio PO, LLCDelaware
Southern Self Storage of Arizona, LLCArizona
Southern Self Storage of Destin, LLCFlorida
Southern Self Storage of Edgewater, LLCFlorida
Southern Self Storage of Florida, LLCFlorida
Southern Self Storage of Grayton, LLCFlorida
Southern Self Storage of PCB, LLCFlorida
Southern Self Storage of Pensacola, LLCFlorida
Southern Self Storage of Santa Rosa, LLCFlorida
Southern Self Storage, LLCFlorida
Springfield Mini Storage, LLCOregon
Square Foot Springhill, LLCOhio
SS 22195 Timberlake Road, LLCDelaware
SS 8117 Timberlake Road, LLCDelaware
SS BAYPORT, LLCDelaware
SS Beeline, LLCDelaware
SS Billy Williamson Drive, LLCDelaware
SS Bloomfield, LLCDelaware
SS Blue Ash, LLCDelaware
SS Brighton MA, LLCDelaware
SS Brookside, LLCDelaware
SS Chevoit, LLCDelaware
SS Cleveland Heights, LLCDelaware



SS Cliffwood, LLCDelaware
SS Deerfield, LLCDelaware
SS Detroit, LLCDelaware
SS Downtown Tulsa, LLCDelaware
SS Eastpointe II, LLCDelaware
SS Ferndale, LLCDelaware
SS Fields Ertel, LLCDelaware
SS Forest Park, LLCDelaware
SS Fort Walton Beal Parkway, LLCDelaware
SS Fort Walton Harrelson Drive, LLCDelaware
SS Glenview, LLCDelaware
SS Greensville, LLCDelaware
SS Hall Road, LLCDelaware
SS Hargrove Drive, LLCDelware
SS Hiawatha II, LLCDelaware
SS Highland Park, LLCDelaware
SS Highway 150, LLCDelaware
SS Highway 280, LLCDelaware
SS Hingham, LLCDelaware
SS Hoffman Estates, LLCDelaware
SS Huber Heights, LLCDelaware
SS Ivy Hill, LLCDelaware
SS Ivy Hill, LPPennsylvania
SS Kettering, LLCDelaware
SS Kingsland, LLCDelaware
SS Lakeside Drive, LLCDelaware
SS Lincoln Park, LLCDelaware
SS Macon Road, LLCDelaware
SS Mamnoh, LLCDelaware
SS Mezz, LLCDelaware
SS Michigan, LLCDelaware
SS Midtown Tulsa, LLCDelaware
SS Millville, LLCDelaware
SS Minnesota II, LLCDelaware
SS MITX, LLCDelaware
SS MNMI, LLCDelaware
SS MNRI, LLCDelaware
SS Moellering, LLCDelaware
SS North Bend, LLCDelaware
SS North Fort Myers, LLCDelaware
SS Norwood, LLCDelaware
SS Palm City, LLCDelaware
SS Peake Road, LLCDelaware
SS Reading, LLCDelaware
SS Riverside Drive, LLCDelaware
SS Sheridan, LLCDelaware
SS South Amherst, LLCDelaware
SS South Euclid, LLCDelaware
SS Storage Court, LLCDelaware



SS Titusville Access, LLCDelaware
SS Trinity Church, LLCDelaware
SS Ward and Citation, LLCDelaware
SS West Point, LLCDelaware
SS Whitesville Road, LLCDelaware
SS Williamstown, LLCDelaware
SS Yale, LLCDelaware
Storage Management and Leasing Co. LLCFlorida
Storage Management and Repair Co., LLCFlorida
StoreMore Self Storage-Pecos Road, LLCStoreMore Self StorageDelaware
Supreme Storage, LLCOregon
Tampa COLO Holdings, LLCColorado
Tampa COLO, LLCFlorida
Town Center Self Storage, LLCColorado
Troutdale Mini Storage, LLCOregon
Tustin Gateway LPCalifornia
Union Storage, LLCOregon
Universal Self Storage Hesperia LLC, a California limited liability companyCalifornia
Universal Self Storage Highland, a California Limited PartnershipCalifornia
Universal Self Storage San Bernardino LLC, a California limited liability companyCalifornia
Upland Universal Self Storage, a California Limited PartnershipCalifornia
Villages Storage Partners, Ltd.Florida
Washington Murrieta II, LLCStorAmerica ScottsdaleCalifornia
Washington Murrieta IV, LLCStorAmerica Phoenix 52ndCalifornia
WCAL, LLCStoreMore Self StorageTexas
West Linn Self Storage, LLCWest Linn Self StorageOregon