On some occasions in extenuating circumstances I have taken partial rent.

The occasion I used it the bill was double normal but it was a single family so there was no other source of water use but the tenant.As for the legality of  restricting a family member because  your sister lives in the unit, it just doesn't seem right I would not want defend it in court even if it is legal.

The affidavits stated that the indifferent person saw a person, matching the description of the tenant, come and go from the property on multiple occasions within the tenancy dates, but never in military uniform.

On rare occasions, I get questioned whether I would put carpet in the bedrooms. 

I had one occasion where one of my rental ads was being constantly flagged.

On occasion, they have required coverage of 200 to 300% of market price. 

If it comes down to it she can always pay an escrow company to distribute the funds each month - so you know the money is coming, but you're not the one holding the cash until the service (tenancy) is rendered.If she's in the middle of a divorce she may be able to have her legal counsel distribute funds.I see these threads on occasion and this is the best advice I've ever seen to solve the issue.

I've seen occasions where the lease had to be bought out when the property transfers which ended up killing some deals.

I don't want to get shot... walking into a home that is occupied without announcing your self is very dangerous for the Agent.Not sure how the other agents who answered on this thread do it.. but thats what I do on the rare occasions I am actually walking into someones home.

If your lease is anything like my rental lease it says that the tenant is responsible for YOUR legal fees and court costs so you should be bringing a court action against them for non-payment of rent and they would be responsible for your back rent AND your attorney costs.Dealing with attorneys gets expensive but it is a necessary evil on occasion.