Definition of ”Housing” in Diverse Uses

One use type is “Community anchor uses - Housing (100 or more dwelling units)”. In one project I used a large area of single family houses, all within tha right distance, for this purpose. The reviewer said: “Single family homes do not meet the intent of the housing use type, which refers to multi-family units.” Can somebody point out this definition to me? Does it say in the reference guide that housing has to be multi-family? The first dictionary I found online says “housing – houses and flats considered collectively.”