Data Sources. Stonegate Elementary School is a highly rated, public school located in IRVINE, CA. It has 1,016 students in grades K-6 with a student-teacher ratio of 31 to 1. According to state test scores, 80% of students are at least proficient in math and 85% in reading. Stonegate Apartments offers one, two and three bedroom in Sussex, WI. Our pet friendly apartment feature amenities such as air heat and central air, large walk-in closets, deluxe appliance package, window treatments, and so much more. Located just 30 minutes to downtown Milwaukee. Air Conditioner. Beautiful Apartments in Charming Sussex.