I'm much more of a tree than palm person, but we've had these palms growing here forever. I'm not sure when they were planted, but there are 2 taller ones and then a few ground-ish ones. So I'm assuming they self-propagated below the parent.

These Bismarckia have the silver fronds (the phone light gives more of a green hue), but I was thinking that I never really see the red at the leaf base like that. I searched around on here for topics regarding green vs silver with red on the leaf and couldn't come up with much, except that the green sometimes have the red tint. These are definitely silver leaves though. Any thoughts?

Young specimens of the silver form have red/purple leaves, some say that the more red the leaves when young, the more silver/blue it will be later. I had some young ones that were entirely red. This one in the photo is still relatively small, perhaps the red you are seeing is just the last remnant of red hanging on before turning to silver. I'm not sure if the green form ones are still red when young, I've never heard anyone talk about it.