Wow! Definitely lots of amazing architecture in Berlin. The single-source community rule is only required in case consulted information such as Architect or Designer of work, vital people, history, dates, context, style, technicalities, etc. are mentioned in your A+D content.

However, you don't need to rely on multiple sources because we highly prioritize and want to know your PERSONAL STORIES (actual experiences, senses, interactions, encounters, descriptions, impressions, observations, reactions, analyses, reviews, critiques, opinions, feelings, and emotions) about your featured building or space. That's what matters. Hope that helps dear @godfish. 😀