EXHIBIT 99.1 Global Self Storage Reports First Quarter 2025 Results Peer Leading Growth in Same-Store Revenues and Net Operating Income Driven by Operational Excellence Millbrook, NY – May 9, 2025 – Global Self Storage, Inc. (NASDAQ: SELF), a real estate investment trust that owns, operates, manages, acquires, and redevelops self-storage properties, reported results for the first quarter ended March 31, 2025. All comparisons are to the same year-ago period unless otherwise noted. Q1 2025 Highlights Dividend ...