Due to rapid urbanization, many of the historical buildings are losing their identity and the cultural values associated with them. India is no exception. There is rapid urbanization around the Kalan Masjid which is a historical mosque in Old Delhi, India. There are extensive encroachments near the historical mosque, which is located in the midst of a complex series of residential buildings. Unfortunately, some of these buildings have encroached on the mosque's land, resulting in its deterioration. Therefore, there is a need for proper guidelines to regulate these encroachments to prevent the destruction of the structure amidst the urban sprawl.This paper investigates the effects of rapid urbanization on the Kalan Masjid in Old Delhi, India. It engages a literature study and site visits to ascertain the site-specific conditions and a context study to identify urban morphology and the changes.The paper concludes that proper guidelines are needed to control rapid urbanization near historical buildings. Such guidelines should be implemented based on a thorough understanding of the factors that influence the encroachment, as well as the challenges faced by this historical structure in a complex urban setting. By taking a proactive approach to protect cultural heritage, one can ensure that historical buildings continue to serve as valuable cultural assets for generations to come. The paper argues that it will prevent the encroachment and deterioration of such structures and maintain their historical significance, which could serve as a cultural heritage and a source of national pride.