i don't know if you are an employee or a renter, but if you are an employee,your boss should weigh in on this.if there isn't a dress code, i guess it's up to you to mention how unprofessional these co workers look.
if you are renting, there's not a lot you can do about how others dress.you just have to maintain your own personal professional appearance, and hope it outshines the sloppy dressers.
most states have a code as far as the state board goes, mostly for safety and sanitation,you could refer to them at your state board's website. other than that, i guess ignoring the mess might be the best way to deal.
take the high road.