This article is a fragment of a systematic scientific study of the design activity of the "Meganom" bureau, conducted within the framework of the author's approach to contemporary Russian architecture.Purpose: To determine the conceptual fundamentals used in the construction of space and plasticity of the Tretyakov Gallery branch, designed by Meganom" bureau in Kaliningrad.Methodology: Building analytical models of the proposed space and plasticity construction in the project of the Tretyakov Gallery branch in Kaliningrad are used.Research findings: The development of the proposed approach and continuity of conceptual ideas is shown. The space and plasticity construction is carried out in the common architectural style taking into account the most striking trends of the world museum architecture, with the preservation of the author's understanding of the archetype of the exhibition space.