Brevik House or Alsand House Grimstad?

My great grandfather Christian Borhaven worked as a captain in the Norwegian navy and lived in Grimstad in a house called Brevik House. I am returning to Grimstad and was wondering if anyone knows of it? It is north of Grimstad around the headland, it is a two storey house on the water front. I have old photos I can send. Alsand house is another family home that was located in Grimstad it is now rumoured to be a museum? My family left Norway around 1925 for Australia and I am now trying to put the pieces back together. Many Thanks Peta