Long-term construction projects become cheaper, but do not sell.
There are many distressed real estate properties (from unfinished shopping centers to entire residential complexes) that have been on the market for many years.
In some cases, lowering the price doesn't help either. For example, Sunflower at Marks was down almost 67% in price, but there was still no buyer.
More details about this can be found in the material at the link.