But until recently renting out family homes was a mom-and-pop cottage business, seen as uninvestable by Wall Street.

但一直以来，出租家庭住房都是华尔街视为不可投资的小生意，这种情况直到最近才有所改变。

For decades, it's pretty much been seen as uninvestable.

几十年来, 它几乎被视为不可投资的。