In normal circumstances, it would be easy-as-pie to find a buyer for this East Village co-op, located in the five-story building at 268 East 4th Street. The apartment isn’t fancy, but it has two bedrooms and 700 square feet. The ask comes in at a very reasonable $695,000, and that’s topped with a very reasonable monthly maintenance of $575. But like all things that sound too good to be true in New York City real estate, there’s a catch, and it’s not even that this is a fourth-floor walkup. The unit comes from an HDFC regulated cooperative, which means that a buyer must meet certain income guidelines to own it.