Maryland-based real estate investment trust, National Storage Affiliates Trust (NSA), is concentrating on acquiring, owning, and operating self-storage properties situated in the top 100 metropolitan statistical areas in the US. Asserting its robust presence, the firm currently holds ownership stakes in almost 800 self-storage properties spread across 35 states, including Puerto Rico. With a mammoth 49.5 million rentable square feet to its name, NSA is among the largest public and private entities managing and owning self-storage properties in the US.