Palm Beach. Aspen. Beverly Hills. For much of the past century, the luxury real estate map has revolved around a handful of established destinations. Increasingly, however, growing concentrations of millionaires and billionaires are turning once-overlooked enclaves into hubs of global wealth.

That’s one of the key takeaways from The Agency’s mid-year report, which examines how an influx of ultra-high-net-worth buyers can reshape local housing markets. According to the brokerage, a handful of outsized transactions can trigger a broader shift—tightening inventory, resetting pricing expectations, and attracting fresh investment that ultimately alters the trajectory of an entire place.

The findings come at a time when the ultra-luxury market is operating more and more by its own rules. A recent Compass report found homes priced at $10 million and above generated a staggering $38.6 billion in sales last year, even as the overall housing market remained sluggish. Meanwhile, Realtor.com found that 13 U.S. markets now qualify as “pure luxury,” meaning more than half of all homes for sale are priced at $1 million or more, underscoring how wealth is spreading across an expanding roster of destinations.