Almost anywhere! Since CUNY BA is a program that works through CUNY, each student has a home college in the CUNY system. This is typically a senior college (4-year college), though some students with fewer than 68 credits are based at community colleges (2-year college) for a time, and it’s where you get all of the benefits of campus life. You pay your tuition and handle your financial aid at your home college. You access facilities, clubs, extra-curricular and student services there too.
You can design your Area of Concentration (AOC) in one CUNY campus or multiple CUNY campuses. See some examples here: CUNY BA Areas of Concentrations (AOC)