FirstKey Lending and B2R Finance are vying to be the first issuer of a multi-borrower single-family rental securitization. The activity follows 16 single-borrower single-family rental transactions that have been issued since November 2013. The first presale report on a multi-borrower single-family rental transaction was published March 31 by Kroll Bond Rating Agency. The $240.79 million FirstKey Lending 2015-SFR1 is set to receive a AAA rating with credit enhancement of 37.75 percent on the senior tranche, according to the rating service. FirstKey is owned by affiliates of Cerberus Capital Management. On April 1, Fitch Ratings published...