After Baba gave his permission, what was the immediate action taken to officially start the construction of the Buti Wada?

Once Sai Baba joyfully gave his permission for the construction, Madhavrao asked if it was an auspicious time to lay the foundation and if they should break a coconut. As detailed in Chapter 39, Baba's immediate and enthusiastic response was, "Break it, break it!" This served as the official go-ahead. A coconut was brought and broken right away, signifying the auspicious start of the project. Following this ceremony, the work on the inner sanctum and the platform for the Murlidhar deity commenced, and the task of creating the idol was formally entrusted to a craftsman.