There are several tree aloes around and I am not sure which is which, but according to the owner of this row of trees, these are 'Hercules'. Hercules is a hybrid between A. barberae and A. dichotoma (San Marcos Nursery). They are faster growing than the parents with beautiful bark. They should grow to 25 feet or more depending on their location. My guess is on the shorter side since our climate is a bit cooler. They do grow pretty fast though. Very beautiful regardless of the name. (Also reclassified into a new genera, Aliodendron.)
Misidentification: Just about any other tree aloe unless you are well versed in these groups of plants, which I am not. Some people include Aloes such as A. speciosa, A. ferox and others like these but hard to compare them with Hercules.
Location:
Aptos - 290 Beach Pines Dr. along the RDM Blvd side of the house
Santa Cruz -
621 41st Ave. 2 double trunk plants.
321 Anchorage Ave. (Not 'Hercules' but "might be" Aloe barberae.)
181 24th St. (Not 'Hercules' but "might be" Aloe barberae.)