Unsold housing stock has been piling up in Gurgaon even as the total number of unsold units saw a consistent decline in the rest of NCR including Noida, Greater Noida and Ghaziabad over the last two years. A recent study has found that of the total 1.82 lakh unsold units in entire NCR market as on second quarter of this year, Gurgaon accounted for nearly 56,550 units (31 per cent share) of total unsold stock – the highest in the region.