If you're searching for an apartment in a gated community in Diamond Bar, CA, you can find 4 available options on ForRent.com. A gated community is closed off to the public by fences or walls and restricts access to residents and authorized guests. You may be granted entrance with a key fob, keycard, gate code, or even on-site security. Apartments in gated communities are popular for renters looking for the extra security of an enclosed community or fixed entrance and exit points.