Real World article
(written from a Production point of view)
Deneva surface

TRW Space and Defense Park as the Deneva colony

TRW Space and Defense Park, now part of Northrop Grumman (Aerospace Systems), was located at One Space Park Drive in Redondo Beach, California.

On 15 February 1967, several scenes on the Deneva colony from "Operation -- Annihilate!" were shot at TRW Space and Defense Park under the walkway near the cafeteria. [1]

TRW was also considered as a location for "Future's End" and its sequel, but no suitable place was found where the crew was allowed to shoot. ("Red Alert: Amazing Visual Effects", VOY Season 3 DVD special feature)