“One significant potential saving would be leaving California, which would eliminate the state's top marginal income tax rate currently 13.3%. California treats capital gains as ordinary income with no preferential long-term rate like the federal system offers.”

My late father weighed it all & kept it simple- 2 houses with primary residence in SW Florida with Zero state taxes & pretty close to kids & grandkids. Leaning towards the same strategy after a few trips around the sun, although I did live in the Aloha state (Oahu) post grad school for a year- it was truly a spectacular setting & experience!

Last time I was in Monaco was on a $300 1 month Eurail pass 40 years ago & crashed for a couple nights in a youth hostel, but it certainly was a wonderful setting and good fun.