In 2000, 19,740 apartments owned by for-profit property owners in the county were affordable for someone making up to 60 percent of the region’s area median income, according to findings from the county’s three-year Affordable Housing Study. In 2013, there were 3,437 “MARKs,” as they’re called.
(“Affordable” is defined as costing less than 30 percent of a household’s income.)