Island Square Apartments 2758 78th Ave SE, Mercer Island, WA98040 Island Square Apartments are centrally located in the Mercer Island business district with easy access to nearby shops,…More restaurants and parks, as well as I-90 and the north end Park & Ride. These studio, one- and two-bedroom apartments are unique as they offer more than 125 different floor plans. California Closets, a granite breakfast bar, stainless steel appliances and large soaking tubs are featured in each unit. Amenities include a Resident's Club (with free Wi-Fi), a movie theater, a business center and underground parking with controlled access. For your entertainment and leisure, they also offer 42" LCD tv's in most units, a state of the art fitness center, hot tub, two outdoor kitchens with barbecues and a fire-pit.