Just a few months ago, Altisource Residential celebrated the fact that it was about to double the size of its portfolio of single-family rental homes, a move that marked a significant step in the company’s transition from a buyer of non-performing loans to an operator of rental homes. The deal, announced in late September, would bring 4,262 single-family rental properties into Altisource Residential’s portfolio for an aggregate purchase price of $652.3 million. That transaction fell right in line with the company’s stated plans to shift . . .