This is a typical, though locally rare, Prunus serrulata, in that it hasn’t been heavily headed back with branches misdirected and congested. This is how it is genetically driven to grow. They require a lot of space. Nurseries propagate these by grafting them at 4′-5′ atop a straight trunk. The trunk will not grow taller. It will only caliper up as this one has. The two grafted plants attempt to grow at their own genetically determined rates.