[3] At its southernmost edge (where Copa de Oro Road meets Sunset Boulevard), East Gate Old Bel Air flanks the campus of UCLA.

This combined contiguous area of East Gate Bel Air and Holmby Hills straddles North Beverly Glen Boulevard (at a bend of Saint Pierre Road and De Neve Square Park).

[citation needed] In general, the further one moves west from Saint Pierre Road to West Gate Lower Bel Air and north from Sunset Boulevard up the Santa Monica Mountains to Upper Bel Air, the smaller and the less flat the building lots and the more varied the styles and price ranges of the homes (with development fueled largely by postwar demand in the 1950s).

[citation needed] On the undeveloped hillsides of original Bel Air in 1922, Alphonzo Bell built water and sewage pipes, installed underground electric and telephone lines, and planted thousands of trees along winding streets traversing the hilly terrain.

[2] A design committee has existed to the present day[3]) to preserve the architectural harmony of the community, with restrictions including low masses, horizontal lines, pitched roofs, and unobtrusive and harmonious colors,[2] and deed restrictions required land purchasers to spend a minimum of $20,000 on home construction.