The credit requires the site to be within 1/2 mile of a neighborhood with minimum 10 units per acre. Is there a minimum area of neighborhood required? For example, does 10% (or any particular percentage) of the area within the 1/2 mile radius need to be neighborhood with that level of density?

Also, do university residence buildings count for this requirement? I'm working on a project just outside of a university campus, and there are several dorm areas with extremely high unit-per-acre density values.