Hi @Madeline J.
Your first question is more geological and relating to climate change so let me tackle that first.
The soil and rock underneath the Miami area is mostly Coral Rock, which is porous and is beneficial for quick drainage during hurricane season. The ground will never sink, however, if sea levels continue to rise over time there could be an effect in the Miami area over 60 plus years. Luckily, as Maggie mentioned, the local governments especially Miami Beach have spent hundreds of millions of dollars in the past couple years bolstering infrastructure for any future issues. Major roadways have been redone drainage has been redone and I and many others can attest to seeing very positive effects. Overall, the governments are managing things greatly and there's not a need for concern.
Secondly, your question regarding the diversity of ownership for foreign versus domestic. Statistics have shown that in the past several years the shift has moved dramatically from foreign investor-based buyers to local and domestic based buyers as currency markets have shifted and the pandemic has also slowed down foreign buyer activity especially from areas such as Europe that have more restrictions of American travel. Right now the mix is definitely a higher percentage of domestic and American buyers and we'd be happy to get you all statistics you want.
Just reach out for any more information, I'm happy to help.