In their 1988 report, The Future of Public Health, the Institutes of Medicine (IOM) defined the three core functions of governmental public health as assessment, policy development, and assurance. The Core Public Health Functions Steering Committee developed the framework for the Essential Services in 1994. This steering committee included representatives from US Public Health Service agencies and other major public health organizations.
Live-work unit simply is a contemporary way of referring to a building that is both the residence and place of business of the proprietor. Certainly the live-work unit doesn't have to be organized in that same way, namely, an apartment on the second story above a storefront or walk-in office.
New renters typically gravitate to these smaller, lower-end kinds of apartments because they have neither the need nor the funds for a larger residence. The defining difference between studios and singles is that a single apartment always has a separate bedroom while a studio almost never does. Additionally, a single apartment is always larger, more functional and more expensive than a comparable studio apartment.