When I went to Pitt in the 70's, I hung out at a number of Oakland eateries, but the "O" wasn't one of 'em. The Burger King in the basement of the Cathedral of Learning, an Italian hoagie place by the Post Office, and an Arabic restaurant "Baalbek" were my favorites.
The BK in the basement was a Roy Rodgers in the early/mid 90s.. don't know what it is now....