A hurricane with sustained wind speeds of 165 miles per hour is categorized as a Category 5 hurricane, which is the most severe classification on the Saffir-Simpson scale. At this intensity, the expected impacts on buildings in its direct path would be severe.
The most likely impact would be total roof failure and wall collapse. Buildings that are not specifically designed to withstand such extreme winds would suffer catastrophic damage, including the complete disintegration of roofing systems and potentially the loss of structural integrity leading to wall collapses.
Therefore, the correct response is: total roof failure and wall collapse.