The doubling of multifamily mortgage rates to around 6 percent since early 2022 as a result of the Federal Reserve’s monetary tightening efforts has rocked the commercial real estate investment sales market. The higher rates have fueled a stubborn bid-ask spread, and debt-service coverage requirements have limited the amount of leverage buyers can borrow to around 50 percent of an asset’s value, down from roughly 60 percent or more earlier this year. The sharp uptick in the price of debt not only requires borrowers to raise more equity, but those who …