Here is a welcome message from the Rancho Santa Fe Association website.

Since its inception in 1927, the Rancho Santa Fe Association has made every effort to protect, preserve, maintain and enhance the community, its natural resources, beauty, quality of life and community character. That Rancho Santa Fe continues to be a highly desirous place to live is reflective of the care, caution and regulation with which the development of the community has proceeded. There are winding rural roadways, rolling eucalyptus-covered hills, green pastures and citrus groves.

The Community has been able to preserve so much of its rural ambiance and historic architectural character due to its unique system of governance and the steadfast commitment of Covenant residents. Under the authority of the Protective Covenant, the Rancho Santa Fe Association has successfully adapted to changing conditions while preserving the fundamental goals established in the 1920′s, and will continue to maintain them for future generations. Continue reading on RSF association website.

Wikipedia remarks on Rancho Santa Fe:

Rancho Santa Fe (Spanish: santa—holy, fe—faith) (known locally as “Rancho”[citation needed]) is a census-designated place (CDP) in San Diego County, California and an unincorporated bedroom community of San Diego County. The population was 3,252 at the 2000 census. At $245,631, it is one of the highest income communities in the United States with at least 1,000 households. The CDP is primarily residential with one shopping avenue as well as several private schools, and single family residential areas situated on uncommonly large lots.

Rancho Santa Fe has many strict architectural design codes as can be exemplified by several attempts from local residents to improve upon or build new residences. Forbes reported Rancho Santa Fe as having the third most expensive ZIP code in the United States, and most expensive in California, with a median home sale price of $2,585,000.[1][2] Some homes in ZIP code 92067 but not within the CDP are valued at more than the median home-value within the Master Planned Community that makes up the official CDP, and many people who live within the 92067 ZIP code cite their community as Rancho Santa Fe even though they do not live within the strict boundaries of the Master Planned Community. The United States Postal Service refers to all homes in the 92067 and 92091 ZIP codes, as well as many of the communities in the 92127 ZIP code, as “Rancho Santa Fe”. Continue reading on Wikipedia.

Besides Rancho Santa Fe Covenant there are many satellite neighborhoods including The Bridges, Rancho Del Rayo, Whispering Palms, Ceilo, and Crosby Estates.