Three new retailers have joined the tenant lineup at Optima Signature, a 57-story luxury apartment tower in Chicago’s Streeterville neighborhood. GoodVets Streeterville, a full-service veterinarian, has opened its 2,000-square-foot office. RUNAWAY, a run conditioning fitness studio, will occupy 4,200 square feet starting in November. Guidepost Montessori, a California-based school serving toddlers and preschoolers, is scheduled to open an 11,500-square-foot school later this year. Located at 220 E. Illinois St., Optima Signature features 490 apartment units and 58,000 square feet of retail and commercial space. Developer Optima Inc. completed the LEED Silver-certified property in 2017. Monthly rents start at $2,265.