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The Pombaline style is a secular, utilitarian architecture marked by pragmatism. It follows the Plain style of the military engineers, with regular, rational arrangements, mixed with Rococo details and a Neo-classical approach to structure. The Baixa district of Lisbon was rebuilt by Eugénio dos Santos and Carlos Mardel. The Marquis of Pombal imposed strict conditions on the rebuilding. Architectural models were tested by having troops march around them to simulate an earthquake, making the Pombaline one of the first examples of earthquake-resistant construction. The Praça do Comércio, the Augusta street and the Avenida da Liberdade are notable examples of this architecture. This Square of Commerce was given a regular, rational arrangement in line with the reconstruction of the new Pombaline Downtown, the Baixa.