0001585389 2026-09-28 2026-09-28 false 0001585389 8-K 2026-10-01 SmartStop Self Storage REIT, Inc. MD 001-42584 46-1722812 10 Terrace Road Ladera Ranch CA 92694 (866) 418-5144 false false false false Common Stock, $0.001 par value SMA NYSE false