SMALL BATHROOM

I work for a family business, our office is small and in an old house-turned office building- there are four other small bussiness that share the house. The thing is the landlords are ridiculous. There is no maintanence whatsoever, the bathroom is disgusting, the hallway is always a mess, light fixtures are old and faded. Each business can make any updates/fix their own office, but what of these general spaces.
We are NOT going to take it upon ourselves to fix and clean a communal bathroom, out of our own pocket, that no one will pitch in for, appreciate, or keep relatively clean.
Is there some kind of legal action we can take, agains the landlord, or some kind of agreement for EVERY one.

Presentation and first impressions are everything, and if the landlord will not cooperate, you have no option but to move. If your office is small, why not move it into your own home? I have a home business and when clients come to my home, I always make them feel comfortable while keeping it professional. If not your home, perhaps another member of your family, but anything would be better than where you are. Think of the write-offs you would get from your home as well.