Hi,
I don't know if you are on Facebook, but there is a page called "Peterhead When You Were A Kid". It has loads of photos of Peterhead from through the years. I'm not sure if you have to be invited on, or if you can just join the page, but there is lots of photos of Buchanhaven. I'm sure someone on there will be able to tell you whats happened to Number 39 High St.
Anne