I've been admitted to the but am probably going to switch to the on-campus option because I already live in LA! I've also been admitted to Columbia. I had a 3.4 undergrad (one bad grade freshman year had me playing catch-up, but finished with straight A's), tons of social work experience. From what I gather after speaking to a bunch of people, your essay is probably the most important part of the application. Make a good, clear case for why you're applying and you should be golden.