The mosque Baba lived in was in pretty bad shape initially, right? How did it get renovated?

You are correct, the mosque was not always in the condition it later became known for. Chapter 5 states that the ground of the mosque had knee-deep holes. A significant change occurred from the year 1912 onwards, which marked the beginning of the mosque's real transformation. This renovation was a direct result of the followers' dedication. In a remarkable show of devotion, the flooring was paved with stones in a single night by the devotees. This event, highlighted in Chapter 5, signifies the growing reverence and collective effort of the community that was forming around Baba.