The elegant two-bedroom co-op in an Upper East Side prewar building had drifted on the market for nine months by the time the first-time buyers laid eyes on it this spring. They fell hard for its original detail, convenient location and friendly price. The sellers, a family with a third child on the way and a desperate eye cocked towards the suburbs, were eager to move. Two days later, a deal was struck for $50,000 below the $670,000 asking price…READ MORE