Deep chair / table scratches in another area.

There was multiple chairs around in the bedroom and it leads me to believe an all night binger was going on.

If they don't agree to this then let them know you will file for cause, High traffic, ... business based, or not,, it's wrong and not part of I bet anything in your city code as far as running a business out of an apartment, even if it's not in your lease,, city code would be enough to use as reason.In the mean time,, post parking lot no trespassing unauthorized cars towed,, give out parking stickers for tenants,, no one in the lot that doesn't live there, and watch that lot.Call police ask for drivebys, any reports from tenants to you have them also call police, In this business sometimes you have to yourself camp out in the building,, I'm serious,, grab a chair sit by the entry door inside.. and protect your asset,, If they don't belong there don't let them in..

These include changing the toilets to "high boy" (chair height/ADA) and bathroom safety rails.

I learned long ago , I sit in the big chair , the tenant sits in the little chair

You can set up more appropriate gathering spaces through landscape/design/providing lawn chairs/etc.But, really, it is very difficult to monitor and enforce guest policy, so learn to deal with it.  

About liability I will remove non-sturdy items and tippy chairs but best advice is to be a minimalist this also controls costs.

We sometimes do that in flips for below and above the chair rail in the dining rooms.We have used grey in bedrooms and bathrooms of a flip.

"Worrying is like a rocking chair, it gives you something to do but doesn't get you anywhere" -Van Wilder With that being said, renting a home is investing, like all investments there is no guarantee of a good return. the only things you can do are a) keep some capital in reserve for emergencies b) screen screen screen c) diversify with multiple properties d) realize that you are only human and you will not make the best decision 100% of time...you cant always win, that's why you should hedge your risk with strong cash reserves just in case. good luck to you!  

You can ask for a written statement from a medical professional stating this person has a disability and requires the dog/s.It is ILLEGAL to refuse to rent to someone with a disability who requires a trained service dog, it would be the same thing as saying no because they have a wheel chair.