Welcome to San Marcos Mini Storage, located conveniently across from Fryâ?Ts Electronics on Bent Avenue just north of San Marcos Boulevard. San Marcos Mini Storage provides exceptionally clean and convenient self-storage in San Marcos with units from a small size of 3x5 (15 square feet) to our largest exterior unit 22x22 (484 square feet). San Marcos Mini Storage is part of the San Diego Self Storage family, which is a locally owned and operated network of neighborhood self-storage facilities located throughout San Diego County. Customer service is our highest priority and over 40% of our customers come from referrals or repeat customers. San Marcos Mini Storage also provides a â?o1st Year Price Guarantee,â?