well first.... do we agree that this is the same snowpeak from majora's mask?

If so then the only humans who lived on the peak were the sword maker and his 'eygorelike' assistant. perhaps it belonged to their family. meh not likely

It is odd that a mansion which looks to be made for humans is found here with yeti's in the area and the only known path leads from the zora's outer domain.

i suppose the yeti's could have built it but thats not likely or maybe it fell from the sky city, but i doubt the ooccoo made it.

Good-luck finding out more info Ciroton