I'll have to defer to others with regard to the Zelkova, but the first picture looks more like Geijera parviflora aka "Australian Willow," but the leaves are shriveled enough it's hard to say, it could even be something like Acacia maidenii.

The first photo doesn't look like my podocarpus. The leaves are shorter on mine. Can you get a photo of the trees?
Renee

Thank you both! The samples were given to me along with a small photo taken with a cell, but the photo is blurry. I will need to ask the exact location in CSUN where these trees are located so I can get a picture of the entire tree.