Disclosed are meeting spaces that are accessible through an adjoining facility or area, and associated systems and methods that provide automated levels of security for classified discussions. The meeting spaces are configured to automatically adapt to different levels of classification, e.g., from any of unclassified to top secret classifications. The meeting spaces are prevented from becoming active for their intended function until all required security features are activated. In some embodiments, the meeting spaces include one or more electronically opaquing privacy glass windows between the meeting space and the adjoining facility. The privacy glass can either appear as opaque, such as when a classified meeting or call is taking place or as a failsafe mode, or can be optically transmissive, such as when the space is unused, is used for unclassified purposes, and/or when the adjoining area is used at the same or higher level of classification.