Banks are showing a growing willingness to rework the terms of U.S. commercial real estate loans to prevent defaults, mitigating near-term losses but also masking growing stress in some parts of the market. As U.S. commercial real estate has come under pressure, with offices and retail struggling in some areas as many people work from home, investors are worrying that losses for banks could add up to tens of billions of dollars. In recent weeks, banks have stepped up efforts to prevent such losses, according to commercial real estate (CRE) analysts and industry data.