This Stanley Park tree is just south of the top of the Magnolia Path on Lagoon Drive. I hope this is a cultivar whose leaves are supposed to look like this - they're very beautiful, as is the whole tree. Douglas Justice's May 2019 in the Garden | UBC Botanical Garden blog this month is on forked-branched maples, and he mentions Acer palmatum being in that group. I think these photos show off that characteristic:
Possibly 'Shigitatsu sawa' since older. There are now many similar cultivars like some of the "Ghost series" but I haven't paid enough attention to ID them. 'Peaches and Cream' is another reticulated cultivar that's been around a while, though I'm not guessing that one. Should be possible for a cultivarista to ID but with the usual caveats.
I second, I've seen a very large 45 gallon that's been there 30+ years at a nearby nursery. The form is identical, so is the leaf. Those multiple branches coming together on a very short trunk is unmistakable when this variety is grafted low and allowed to grow without manipulation or training. I would have loved to get it, but the width was way too much for my lot and the fact we were finished with our landscape left no room for it. The massive crown low to the ground doesn't lend itself to a suburban lot, much better suited for a large garden or stroll garden.
Shigitatsu Sawa for sure a very quick growing tree, now is the best time to see the reticulation on the leaves (crisp and well defined pattern) , here's some pics of mine few more years and this will have to be cut back getting near the fence now !