Modularity is an effective tool in the product development process. The use of modules for creating flexible platforms that respond to changes in product functionalities is common. In the current global market, the customization of mass production models is particularly noteworthy, as this model cost-effectively meets diverse market needs. In this model, modules serve as a key concept throughout the stages of construction, use, and ultimate disposal. Modular design provides features and functions that address various market requirements. This research presents principles for revitalizing valuable historical fabrics by examining the concept, characteristics, and history of modular structures. After analyzing the characteristics of modular architecture and reviewing a proposed example within the historical context of Lalehzar Street, the study offers recommendations for improving modular design in these contexts.