According to Bloomberg and the Florida State University:
To put in context 225,700 people is more than double (just under x3) the entire population of Newport Beach.
Here is what the threat assessment according to the NOAA Sea Level Rise Map
Areas Effected By Sea Level Rise according to Bloomberg scenario
Areas threaten by High Tide Flooding:
Southern Orange County appears to be physically unaffected by rising water, possibly due to elevation, but it is vulnerable to social impact, even at the present seal levels