Foliage is evergreen, simple, alternately arranged, elliptical, 2-3" long, dark glossy green in the center of the leaf, margins yellowish-white (silver?), slightly undulated, with or without spines. Fewer spines on slower growing branches. Very attractive year round, especially with the fruit. New foliage in spring should be somewhat pink.
Flowers are dioecious, all females on this tree. Small white in short clusters, in the spring. You may not notice them.
Fruit is a red berry like drupe about 3/8", can't say round because they are somewhat elliptical though the ends are not pointed.
Trunks are smooth, gray to silver colored. The canopy can be so dense you might not see the bark.
Assuming you are looking at a variegated holly, and the margins are yellowish you could be looking at one of a dozen cultivars. I am basing my identification on the most likely candidate to have been planted due to availability in the nursery trade. I am always up for being corrected, so if you think I am wrong, let me know, it won't be the first time.
204 Appleton Dr
248 Moosehead Dr.