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In page House of the Black Madonna:

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The House at the Black Madonna was originally designed to house a department store. Herbst’s store occupied the ground and second floor of the building. Grand Café Orient was established on the first floor. Above that were apartments. Minor changes were made to this arrangement in 1914. In the mid-1920s the café and store on the second floor were converted into bank offices. The department store was closed in 1922.[1] Further alterations to the architectural integrity were made in 1941, when functionalist architect V. Kubik refashioned the wooden frames on the ground floor windows with steel. During the communist period, the building was subdivided internally into more office space and then designated the state exhibition agency.