Some places, such as the US east coast[1][2], are expected to have to deal with sea level rises 3-4 times the global average or 2m to 8m of sea level rise. So property up to 8m or more from the current sea level may be concerned.
[1]: https://www.nature.com/articles/nclimate1597
[2]: https://www.washingtonpost.com/news/energy-environment/wp/20...
https://www.fema.gov/national-flood-insurance-program
https://www.nytimes.com/2017/11/04/business/a-broke-and-brok...
"The government-run National Flood Insurance Program is, for now, virtually the only source of flood insurance for more than five million households in the United States. This hurricane season, as tens of thousands of Americans seek compensation for storm-inflicted water damage, they face a problem: The flood insurance program is broke and broken.
The program, administered by the Federal Emergency Management Agency, has been in the red since Hurricane Katrina flooded New Orleans in 2005. It still has more than a thousand disputed claims left over from Sandy. And in October, it exhausted its $30 billion borrowing capacity and had to get a bailout just to keep paying current claims."
https://www.npr.org/sections/money/2017/09/29/554603161/epis...