The Bear family decides to move from their hillside cave to a tree house in the valley. from the site. I'm suprised that I recall a lot about this book.
This is in the hill in a cave, with tarrance rows of vegetables grown along the zig and zag path, the soil was very hard to grow food, and not many trees for lumber. (Berenstain Bears First Time Books) By Stan Berenstain This is were Small Bear, Mama Bear Papa Bear, lived before moving to the Treehouse, Its shown on the cover of the book.