I think this is a kitchen. Typical to keep the kitchen away from the main house to avoid burning the whole thing down!
Near Grand Rapids MI! The tapering staircase, which builder Dennis Carpenter crafted from a cherry tree on the property, incorporates the tree’s natural contours, as well as its distinctive irregularities in the handrail and spindles. Skylights in the purlin-and-gable roof system illuminate the loft.