Source: U.S. Census Bureau
Release: Housing Vacancies and Homeownership
If the vacant unit is not for-rent or for-sale-only but is held for weekends or occasional use throughout the year, the unit is included in the category 'for occasional use'. Time-shared units are classified in this category if the vacant unit is not for-rent or for-sale-only, but held for use for an individual during the time of interview.
U.S. Census Bureau, Housing Inventory Estimate: Vacant Housing Units Held Off the Market and for Occasional Use in the Northeast Census Region [EOCCUSENEQ176N], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/EOCCUSENEQ176N, April 25, 2019.