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Keep in mind that you often omit the article pronoun for a city's or a person's names (like Berlin or Peter etc.). You do use an article for a building's name however. Intitutions bei der Verwaltung fem. beim Amt obj. Companies bei Google (Google is a name therefore no article) Cities in Berlin (a name again) Houses/Buildings im Büro in dem Büro obj. im Empire State Building (named ...
https://german.stackexchange.com/questions/5411/when-to-use-bei-bei-der-beim-and-in-im-in-der
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