Medical office is beloved by commercial real estate investors, operators, and owners because tenants typically stay for years and have good revenue and credit, allowing rent increases over time. The medical business never really slacks, and demand is constant. Just ask Amazon why it's expanding efforts in broadening virtual and physical medical clinics.

According to Shawn Janus, national director of healthcare services in the U.S. at Colliers, there's a new trend of medical coworking, like a cross between medical and flex office types.

"Medical coworking spaces are shared work environments designed specifically for healthcare professionals, including doctors, entrepreneurs, therapists, and researchers," he wrote. "These spaces provide a flexible alternative to traditional clinical settings, enabling practitioners to rent office or clinical space on-demand, often equipped with state-of-the-art facilities and medical equipment."