Shades of Green website's FAQ also state you need an ID. We stay there so never paid any attention, but the reality is, it's like a military base/facility and it's not for public use, except for special events i.e., the golf course there holds tournaments and classes are sometimes held on property through institutions like GA Tech. But, just to walk in and have a meal thinking it'll be cheaper or something is not what it's there for. We eat breakfast there because a buffet is a buffet and it is cheaper than most, but other than that, the restaurants aren't anything special.