At first blush there isn't much about 68-A Street to mark it as different from anywhere else in the city. Children play ballgames in the rugged road nearly free of traffic, as tropical music floats out from behind graceful porches and balustrades.
But if you spend any amount of time here, before long you might think you're seeing double.
“Hi, I'm Carla, and this is my sister Camila,” said Carla Rodriguez, a smiley, bespectacled 9-year-old. “We're twins and we love living on this block because we have twin friends.”