The Riviera is not one market. The capes, Ferrat and Antibes, are a closed club of estates that trade by introduction between families who have known each other for two generations; a listing there is a sign that something has gone wrong. Saint-Tropez is a summer economy where the house is priced by the rent it can earn in July. The hills above Cannes and Nice are a normal prime market with agents, portals and comparables.
What the three share is the French system, which is slower, more expensive to hold and more predictable than the Spanish one. The notary is neutral, the deposit period gives the buyer ten days to walk away, and the wealth tax on real estate is the number that decides how long people keep their houses.
The trophy assets are the water frontages on the capes, and they are as scarce as anything in the world. The desk has watched three sales on Cap Ferrat in two years and none of them had a brochure.