I think the best quilt retreats are those where you can just sew, either your own project or a class. The one thing I don't want to worry about is cooking and cleaning. If you are going to prepare meals on site, you would want to check with your local health department. My sister had a place, in an old house, where she was just serving tea, cakes and cookies and she had to install restaurant quality kitchen fixtures. Might be different if you don't prepare the food there, but have it catered. Anyway, check with your local health department, zoning department (is it zoned for commercial use?) and see if there are any other permits you need. Fire regulations may also apply. Insurance will also need to be checked. She also had 4 parking places, one of which had to be handicapped. The house already had a ramp. Don't want to sound negative, but there's a lot of things you need to check first!