Bismarckia nobilis - Bismarck Palm
(Click on underlined title to see more)The Bismarck Palm has silvery to blue-grey-green foliage color(described as 'glaucous'). Green leaved strains are also available but the glaucous strains do better in SoCaL and other similar climates. Grows to around 40 plus feet to the top of the foliage, and with adequate conditions can do so in about as many decades, and potential to 100 feet in a century. Has a moderate water requirement, though can be fairly drought tolerant/adaptive in many residential situations. In the photo above, the palm at left palm is about 20 feet tall to the top of the foliage, and about 15 feet wide. Location: Balboa Park Arboretum. Photo below, Bismarck Palm growing wild in Madagascar, - simple landscape idea. Bismarckias commonly grow in some savannah regions of Madagascar. You could use Nassella tenuissima grass and Bismarckia to make this look here in SoCaL.
Note: Bismarckia palms are very sensitive to roots being cut during transplanting, even from containers, and of course much more so if grown in the ground and then dug out, - the palm will often die in that case, or if not will have severe leaf dieback, and will take at least a couple years to grow a new full crown of fronds. To minimize any transplant related leaf dieback, plants grown in containers for later transplanting should not have any roots growing out of the container that would need to be cut in order to transplant, though it's good to cut root ends as they begin poking out of the pot holes in the pots to stop them from getting any longer while they're growing in the pots, and preferably any root cuts should be done at least two weeks before transplanting out of the container. Otherwise, what will typically occur is some partial leaf dieback showing in about 2 weeks after transplanting, - and more specifically, typically what will happen is that one of the 'half-way' developed leaves and the two oldest leaves will show significant dieback related to the transplanting, even with perfect watering practices and soil conditions. And if all goes well with new leaf development, the palm should look 'all good' in about one year.
Also, when transplanting palms, whether container grown or from the ground, there's usually no need or benefit to cutting any circling roots, since they will soon be superseded by adventitious roots arising from the subsurface trunk-base-root-crown. This is unlike with most other landscape plants, particularly dicot plants(i.e. such as non- palm trees, shrubs, vines, etc), which do benefit from unwrapping and redirecting circling roots.
Photos below in habitat in Madagascar: