Old Pa Pitt nursed a secret grudge against this building for years, for the very petty reason that it replaced the old Aldine Theatre, which he had hoped to see restored as part of the revival of the theater district downtown. But on its own merits, the August Wilson African American Cultural Center is a striking building that makes the most of its triangular site, and certainly no Pittsburgher better deserves the naming rights to the first theater to meet our eyes on Liberty Avenue. San Francisco’s Allison Grace Williams was the lead architect, and she made the building into a kind of announcement for the Cultural District: here, it tells us, you are entering a place where great things are happening.