Yes, Martin is now Lockheed-Martin. Other tech companies included IBM, Hewlett-Packard, Oracle, Level3, EchoStar, DISH, and others.
Conoco bought the land like 10 years back and demolished the old offices for a "clean energy lab" IIRC , though that never happened and now Tape Drive (and Disk Drive, on the western side of the campus) just deadend into a large empty field.
The fact that those offices are gone feels like a weird message about tech, but i don't know what it is.