Odd boathouse/building near Kona property

[Orion]

Does anyone know the history of the strange building with white "wings" on the peak and the accompanying "boathouse" at the end of the jetty that is located on the Kona Mansion shores property due east of Blueberry Island on Moultonborough neck? I'm not talking about the Swallow boathouse. This is a pair of red buildings with white "wings". I searched the forums with no success. Sorry, forgot to take a picture.