So who owns all that vacant land that Bill DeBlasio wants to see buildings on, pronto? Crain's has a breakdown:
After removing some of the most questionable assessments, a general picture of the city's buildable vacant space emerges. The supply of apartments follows demand—yet people can be fickle in terms of where they want to live. According to the most recent data from 2011, the percentage of rental apartments that were vacant was 3.12%, well below the 5% mark that indicates a housing emergency. While Brooklyn and Queens show the largest number of vacant residential plots, the most acreage of vacant land available is in far-flung Staten Island.