A building or portion thereof used to provide services or treatment simultaneously to four or more patients that provides, on an outpatient basis, one or more of the following: (1) Treatment for patients that renders the patients incapable of taking action for self-preservation under emergency conditions without the assistance of others; (2) Anesthesia that renders the patients incapable of taking action for self-preservation under emergency conditions without the assistance of others; (3) Emergency or urgent care for patients who, due to the nature of their injury or illness, are incapable of taking action for self-preservation under emergency conditions without the assistance of others.