It sure is a pretty plant but I'm wondering if it might be something other than Agave xylonacantha? It looks very different from all the other photos at this database entry.

I agree, and I am pretty certain it is not even an Agave to begin with.

Aloe arborescens.



Perhaps

Aloe (Aloe arborescens 'Variegata')

I thought it looked most like an Aloe of some sort but living in a hot humid climate, I'm not very knowledgeable with Cacti & Succulent type plants.

The big clue is the base of the inflorescence just barely visible as a brown stub facing the camera on the biggest rosette. That used to be (recently) an inflorescence. Somebody trimmed it real close but it's there, and it looks like what's left from the fall. Flowering annually is a big giveaway for aloes and it is basically unheard of in agave sensu stricto (before the recent consolidation anyway).

That and the octopus-like posture of arborescens, which is probably the second most common aloe around here, so the pattern is kind of imprinted on my brain.

I'm guessing there used to be an agave to the left of it but when that agave died (maybe it flowered) they removed it without removing the sign.