That's a good question, Gary.
I have a friend who fancies himself a pretty good cook, and he wanted to bottle up some spaghetti sauce and sell it to his friends, and the city wanted him to submit his kitchen plans for approval, which made him ask what his rights were in making up a good batch of sauce and selling it to friends.
Well, you know what happened, and thankfully, nobody got sick because while my friend is a pretty good cook, he's not a really good food packager.
In your case, you may be able to be discriminatory if it's a 1-4 family house and you don't implicate a real estate licensee. But that's not a guarantee, and you might call the local authorities to see if you are burdened by the requirements of the fair housing laws.