American Homes 4 Rent, the largest publicly traded player in the single-family rental market, late this week agreed to buy American Residential Properties in a deal valued at $1.5 billion. It was the second transaction involving real estate investment trusts in the SFR sector within three months, and has sparked talk of further consolidation, including perhaps mortgage REITs. A research note from Keefe, Bruyette & Woods, penned right before the AH4R-ARP combination was unveiled, noted that mergers in the space are possible “given current valuation discounts ….” In other words, the share prices of single-family rental REITs have been...