None of the industries there look like particularly good fits, so I've already located my model of a Rio Grande gas station right at the tracks. Behind it, I'm not so sure - one potential candidate is the frequently-mentioned Larson Ladder, maker of the three-legged orchard ladders that were common throughout the Santa Clara Valley. One of my neighbors who grew up in San Jose even remembers them, so as a hometown favorite, they've got first dibs on the location.
But what did a ladder company look like? Bill Foley from the California Pioneers of Santa Clara County managed to find a pair of aerial photos of the area, one from 1941, and the other from 1958. Both show that much of the area west of the tracks was still orchards, but the 1941 photo shows Larson Ladder sitting a block west of Meridian Ave on Moorpark - a bit far from the tracks, but let's use it for inspiration. The plant sat on a narrow lot in the middle of orchards. There's at least one long gable-roofed building, and then another, lower building, probably a couple hundred feet long with a sawtooth roof. I normally think of these as brick (which seems inappropriate here), but Packing Houses of Southern California shows a pair of wooden sawtooth packing sheds on SP's Santa Paula branch, one from the McTeague-Kevett packing association, and the other a Sunkist lemon packing house. Either might be a nice inspiration for Larson Ladder.
Er... wait a sec... Larson Ladder would have been several blocks away from where the tracks are. What was in that "light industry" area closer to the tracks in the photo?
Er... because I didn't think of it before now.
[Street level photos: mine. Aerial view: Google.]