Reference Data links:

http://links.mlsstratus.com/actrep/Current/highlight.pdf

https://www.census.gov/quickfacts/nassaucountynewyork

http://www.longislandindex.org/data_posts/average-home-size/

https://www.census.gov/construction/c30/c30index.html

https://www.redfin.com/neighborhood/219261/NY/New-York/Long-Island/housing-market