Advertising on Building
Advertising as art? Yes, it is protected as a monument.
In Western Europe it became popular after World War II to place ads in public spaces. In Eastern Europe doing so didn't make sense since there was no competition between companies in communist countries. Nevertheless, such ads were a sign of a contemporary city. So the ads were financed by the government. You will find a second advertisement on the building across the street.
By the way, Tatra is a vehicle manufacturer in Kopřivnice, Czech Republic, and Balkancarpodem was a vehicle manufacturer in Sofia, Bulgaria.