Capital markets have plenty of reasons—$3.67 trillion to be exact—to watch for cracks emerging in loans due to the COVID-19 crisis. That’s the current size of the outstanding commercial and multifamily mortgage debt in the U.S, according to the Mortgage Bankers Association. One early trouble spot to surface is among highly-levered lenders who rely on short-term repurchase (repo) warehouse lines of credit with mark-to-market provisions to finance loans