What specific event led to the Buti Wada being transformed into the Samadhi Mandir?

The transformation of the Buti Wada into the Samadhi Mandir was a direct result of Sai Baba's final words before his passing. As detailed in Chapter 39, Bapusaheb Buti was deeply worried about the mansion's future as Baba's health declined. However, by a "stroke of fate and by Sai’s command," the building's great fortune was realized. Baba's last words were, "Place me in the mansion." This clear instruction, coming from Baba's own mouth, resolved all uncertainty. Consequently, his holy body was placed in the inner sanctum, which had been built for the Murlidhar idol, and the mansion officially became the Samadhi Mandir.