Given America’s dining ecosystem, in which big-city rents are high, profit margins tight and business failures common, no one should really be surprised anymore when a refined restaurant turns up in a suburban strip mall. I think it’s safe to say that some of my most memorable meals have been in places with views of a parking lot. But even armed with this knowledge, I was not prepared for the dichotomy of Chef Guo in Alexandria. Situated in a stand-alone building that squats behind an Exxon station, just steps from a sandstone-colored strip mall with a laundromat and barber s