The aim of this course is to enable students to understand the concept of urban interior space in a multifaceted way within the discipline of interior architecture and environmental design. The course provides a theoretical foundation for understanding how interior spaces are formed, used, and transformed in an urban context, focusing on fundamental concepts such as interior-exterior continuity, permeability, publicness, experience, and usage patterns. Students are expected to evaluate different examples of urban interior spaces in both historical and contemporary contexts and to analyze user behaviors, design strategies, and public layers through these examples. Furthermore, students are encouraged to reflect on the potential areas of urban interior space and develop a critical perspective throughout the course. The course begins with the definition and conceptual framework of urban interior space; it progresses through transformations in the historical process, different theoretical approaches, and spatial typologies. The morphological, sensory, and experiential elements that influence the formation of urban interior space are examined based on the human body and user movements. Situations where interior space is transferred to public space and public space is transferred to interior space are exemplified through temporary structures, cultural centers, social spaces, and layered experience areas. In the following weeks of the course, user participation, socio-cultural needs, and collective forms of use are discussed alongside contemporary design approaches.