from the SCMP. This article is fairly complex and hard to follow, and doesn't really seem to draw any conclusions, but if you'd like to peruse it, here it is Chasing ghostsWhere is China's next wave of empty 'new towns'? The "demolition index" referred to in the article is simply an index of new construction projects already on the books, and expected to complete within the next five years vs. existing, occupied housing. That is, the number of existing units that would need to be abandoned/"demolished" in order to satisfy (balance) the supply and demand for the new housing. For example, for Ordos, the "demolition index" of 54% means that 54% of existing homes would need to be abandoned in order to satisfy the actual available new housing being constructed.