The article deals with the study of structural and semantic features of the German professional language of architecture and construction. The study is based on the main principles of structural-semantic linguistic paradigm and represents the modeling of terminology in the form of a thesaurus with its multilevel classification structure. Achieving the main goal involves the selection of various structural types of terms and phrases, the analysis of key terms and their semantic fields and the study of possible logical-semantic relations in the proposed German professional language. The study was conducted in four stages. The first stage included an explanation of the main approaches to the study of both terminological systems of professional languages and individual terms. The second stage consisted in the analysis of logical-conceptual relations between terms, such as hypero-hyponymy, subcontracting as well as relations concerning the localization of the object, its purpose, etc. At this stage, terminology is considered as a thesaurus, taking into account the specifics of the organization of the studied branch of knowledge and the lexical-semantic field of the key terms of architecture and construction. The third stage was based on the structural and morphological analysis of the terms and included a description of structural models of terms. The last stage concerned the formulation of the conclusions of our study.