Did Sai Baba ever say anything about what he would do in the Buti Wada before he passed away?

Yes, he did. When Shama presented Bapusaheb Buti's plans to him, Baba joyfully gave his permission. Chapter 39 records his sweet words about the mansion. He said, 'After the temple is complete, we too shall come to stay there.' He also looked toward the mansion and added, 'After the mansion is finished, we will use it for ourselves. There we shall talk and walk; there we shall all play together.' While the devotees likely interpreted this as him living there, his words were profoundly fulfilled when his body was permanently enshrined in the mansion, making it his eternal home.