https://selling-guide.fanniemae.com/Selling-Guide/Origination-thru-Closing/Subpart-B2-Eligibility/Chapter-B2-1-Mortgage-Eligibility/Section-B2-1-1-Occupancy-Types/1032995641/B2-1-1-01-Occupancy-Types-05-01-2019.htm
http://www.bancmac.com/Rates/occupancy.pdf