Did the mosque where Sai Baba resided undergo any changes over time, and what prompted them?

Yes, the mosque experienced a significant transformation. Initially, the dwelling was very rustic, with knee-deep holes in the ground. Chapter 5 notes that a new phase began around the year 1912, which marked the start of the mosque's renovation. This change was driven by the growing community of devotees around Baba. As their numbers and devotion increased, they took it upon themselves to improve the space. In a single night, the devotees paved the floor with stones. This was a marked change from Baba's earlier, more solitary days, even before the mosque, when he lived in the Takia.