The vacancy rate across single-borrower, single-family rental securitizations rated by Morningstar Credit Ratings fell to its lowest level in a year, as high retention rates for full-term leases kept performance in the sector within expectations, according to a company report. The vacancy rate dropped to 4.1 percent in March, driven by an improving average retention rate, which rose for the third consecutive month, the report said. The average retention rate for all single-borrower, single-family rental securitizations now stands at 79.5 percent, it noted. In addition, the overall turnover rate held...