Tricolor Beech (fagus sylvatica tricolor): You have a Tricolor Beech. This deciduous tree has green leaves marked white and edged pink. It's a slow grower, averaging 24-40 feet at maturity. The foliage burns in hot sun or dry winds. The leaves turn red brown in fall and hang on tree well into winter. It's often used as a container plant tree.
Beech (Fagus sylvatica) - British trees - Woodland Trust