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In normative or prescriptive theories, architectural requirements are set asparameters to support design decisions. A set of formal parameters is suffice togenerate a wide variety of compositions, but associated to the same formallanguage. This paper looks at the work of the Portuguese-Brazilian architect,Delfim Fernandes Amorim, whose contributions to the dissemination of modernideas and the development of a particular architectural lexicon is quite relevant,particularly his addendum to the municipal land use and occupation act, whichbecame generally known as the Amorim's Law. It consists basically in allowingspaces of transitory occupation and specific architectural elements to be builtbeyond the mandatory setback limits. This paper presents the development of agrammar that shows how some of the parameters described in Amorim's law areable to create a strong formal language and influence the building's architecturalcomposition. The grammar was developed in two successive stages: the firstallows the generation of the pattern of adjacency of the apartment's rooms; thesecond, guide the insertion of the openings and architectural elements as definedby the Amorim's Law.