Two months after it was revealed that Fannie Mae would provide $1 billion in financing to single-family rental operator Invitation Homes, certain factions of the mortgage industry are starting to yell “charter creep.” Moreover, the National Association of Realtors and other trade groups are complaining that perhaps Fannie is spending too much of its limited resources helping Wall Street – the Blackstone Group grubstaked Invitation Homes initially – and not enough to help the first-time homebuyer. “What’s...