ALLENTOWN, PA. — City Center Investment Corp. has opened Tower 6, a Class A office and retail building in downtown Allentown. Tower 6 is a 145,000-square-foot, 12-story, glass and steel building with floor-to-ceiling windows and is located at 600 Hamilton St. The building officially opened May 3. The building’s tenants include Bank of America Merrill Lynch, Avantor, Talen Energy, CrossAmerica Partners, NJR Energy Services, fedRFP and Morton Brown Family Wealth. The top of Tower 6 features Merrill Lynch signage. City Center Investment Corp. partnered with a number of Lehigh Valley companies to design and construct Tower 6, including Spillman Farmer Architects, RETTEW Engineering, Serfass Construction, DesignPoint, Offix Systems, Lutron, K&H Window Treatments, ESG Systems and CFI, a Knoll furniture dealer.