Trader Joe’s opened its highly-anticipated first store in the Twin Cities this spring. It happens to be located at Excelsior and Grand, a much-heralded suburban town center in St. Louis Park; the one example in the Twin Cities that planners and developers look to as they contemplate a mixed-use town center elsewhere. I recently paid a visit to Trader Joe’s to see whether it lives up to its hype. The store itself is fine, but what struck me was the parking lot. It is small, with narrow stalls, hemmed in on two sides by an imposing mixed-use building, difficult for a large vehicle…