Right now these trees are fairly small and from where they planted them I hope they do't get too large. Have never seen any flowers on them.
It looks like Ilex cassine, a native to your area.
These were just planted in an office park here. I am not familiar with Dahoon Holly. Is it the same as Florida Holly? The leaves look very similar though. I will need to get more picts.
Definately not Pittosporum phylliraeoides. They do both have berries but the berries and leaves are very different. Evev the barkis different. I definately need more pictures. Or since they were just planted maybe there is a tag. Now that would be funny.
Looks like a California Pepper Tree I used to have, but the seeds eventually turned red. Ther tree got very big.
On closer inspection of your photo I would rule out Ilex altogether. The leaves of the plant in the photo appear to be opposite. Ilex leaves are alternate.