Based on some things I have read and also from people who were actually at Royal Palm, most of the damage is to the interior. While the outside of the building appears to be pretty sturdy and has withstood numerous hurricanes in the past, the interior did not fare as well. One engineering theory was the sliding glass windows, while heavy and strong, many gave way during Irma and this lead to substantial interior damage. Considering all rooms face the water, add the extreme wind and rain and you have a recipe for disaster if the sliding windows gave way.