Plaza Fiesta, which is on Buford Highway north of Clairmont Road in Atlanta, has come a long way since 1999, when developers bought it for $10 million with the idea of tearing it down to build a Wal-Mart or a Home Depot. Instead, they pursued the concept of a Latino lifestyle center. It was a risky proposition, but it turned into a profitable venture that could serve as a blueprint for shopping centers nationwide.