From the record
“The Waldorf Hotel was a historic hotel building on Main Street in Andover, South Dakota. It was a three-story orange brick building with a rounded projecting section at the street corner.”
Wikipedia article Waldorf Hotel (Andover, South Dakota), CC BY-SA 4.0.
One of 13 National Register listings published here for Day County · listed in 1979 · category: Building · built in 1903, Victorian architecture.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service · the Wikipedia article