MacCallum shared his grandfather's interest in multi-tenant properties where developers lease properties and are responsible for providing community services, thereby replacing the functions traditionally provided by the state. He details these ideas in his 1970 booklet "The Art of Community", as well as his 2003 articles "The Enterprise of Community: Market Competition, Land, and Environment" and "Looking Back and Forward" (which describes the influence of his grandfather); and his 2005 article on stateless social organization "From Upstate New York to the Horn of Africa."