NEW YORK–(BUSINESS WIRE)–Kroll Bond Rating Agency (KBRA) has assigned preliminary ratings to six classes of DBCG 2017-BBG commercial mortgage pass-through certificates, a CMBS single asset, single borrower (SASB) securitization. The collateral for the transaction is a $500.0 million non-recourse, first lien mortgage loan represented by two pari passu A notes. The floating-rate loan requires interest-only payments and has a three-year term with four 12-month extension options. The whole loan i