Welcome to National/54 Self Storage, located conveniently on Hwy 54 at the intersection of National City Boulevard- the main entrance to the famous National City Mile of Cars. National/54 Self Storage provides exceptionally clean and convenient self-storage in National City from a small size of 5x4 (20 square feet) to our largest exterior unit 10x27 (270 square feet). National/54 Self 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. National/54 Self Storage also provides a â?o1st Year Price Guarantee,â?