First of all, you have buying power as the federal government, so when you approach whomever—Oxford, O&Y, or whomever—you're going to lease so much space, you've got buying power. You don't need a law.
Laws would be nice, but you just say, “Here are the standards of performance we want for lighting, air change, whatever, and we want to see that in your offer to us, and if you don't have it, we're going to shop around.”
You've got buying power, so use it.