This boathouse is in
Senter Cove..SW side Moultonbourough Neck. It is the last artifact of an estate, and is now the Club House for a Condominium complex. The Steamboat Swallow was berthed there back in the day. Notice the TALL Vertical doors...The Swallow had masts that needed to be accommodated in the boat house...

NB
PS: That original picture above was taken from....an old runabout..Maybe a
Gar Wood ......??
PPS:
Senter Cove does NOT show up (named) on the Bizer Chart.. It Does show up on the old competing chart...Inside Wallace Island.