I just had this issue on a home that has windows, drywall, heat...but concrete floors. Since there are many high end properties these days with painted concrete floors, especially high end condos in major cities, I don't think concrete floors with area rugs alone suggest not finished or partially finished. And yet...if felt partially finished.
The appraisal is being ordered now. Will be interesting to see if the appraiser notes the lack of carpet or other type of floor coverings as a distinction.
It also depends on the style of home. The one above is a split entry where at least a portion of "the basement" was intended to be a finished space at time of construction It has a fireplace in the room with concrete floors. Obviously intended to be a family room or Rec Room. In Seattle you have many homes where the basement was never intended to be living space at time of construction and the conversion to living space is often difficult to justify, even if there is dryway, heat and windows, due to ceiling height and other factors.
Valuing the basement at the same price per square foot as the main and upper floors, is almost never the case, unless it is a "reverse floor plan" as intention at time of original construction.