Hi Jean Claude,
Given the real estate industry is unregulated in Mexico, it all boils down to trust. Can someone in San Diego list the property and advertise it for sale, yes. What happens when you have a buyer with an offer? There are no standardized forms and far more of the contracts are unenforceable than are enforceable.
We would advise you to find someone local in Baja who has moved there and regularly manages transactions there. We in California are used to laws and regulations and may not be able to best protect your interests.
Best of luck to you,
Mark & Kari Shea
Shea Real Estate
National Association of Realtors
CA BRE License 01713506