The Arden Theatre Company, launched 30 years ago by a couple of young Northwestern grads, started out in the little upstairs space at America’s oldest theatre (the Walnut Street). In 1994 they bought a 50,000-square-foot building a couple of blocks from the old waterfront, more or less under the Ben Franklin Bridge. Subscribers started going there – and eating dinner beforehand. Now the Old City neighborhood is Philly’s nightlife capital, and Arden has three stages and an apprentice program, and regularly wins critical acclaim and awards.