Blackstone unit Invitation Homes sued over rental house’s conditionLast spring, Edit Novshadyan and her husband were happy to land a Sun Valley three-bedroom house, with enough room for their son to play and their family to grow. Another child was on the way. So they signed a one-year lease with Invitation Homes, an arm of private-equity giant Blackstone Group and the largest player in the emerging single-family home rental industry.