If you think that their activities go beyond recreational use (large quantities in the house, visible scales or bags, people coming and going in excess) it's time for a more serious conversation. 

Like someone that would not likely walk off and leave you holding the bag?

We ride bicycles about 100 miles every week and almost every week we stop at Nordstroms so my wife can get bag loads of Shiseido makeup.

If not I will ride it out for 5 more and bag it at 60.I love the opportunity and I love being a landlord- but if I can trade what I work for now for real passive income- no brainer.

The units are heavy and feel very secure, and are much easier to install than any others I have encountered.This has worked well for me with 2 triplexes each with a common entry door, but we are adding to our portfolio and I may be using the landlord locks recommended above in the future- it would be nice to have less keys jingling away in my bag!

I've had two occasions where the reference they listed told me not to rent to them because they were violent, late payers, or too needy.Not doing a criminal, credit, background check, which might have revealed criminal or credit problemsBeing slow to evict (mentioned by others)Believing their sob storiesAccepting partial paymentsFailing to document every conversation or interactionNot walking through the property to make sure they're taking care of it (I now walk through every 9 months so I can see problems in different seasons)We've found crack pipes and other paraphernalia after they moved outWe've discovered piles and piles of trash (some bagged, some not) in closets, basements, sheds when trash cans and pickup service are included in their rent - all they had to do was carry it out, at no cost to themWe've Found smokers, pets, extra peopleOverall, I've had great success as a property investor. 

Also am about completing my book on real estate but still don't want to let the cat out of the bag for now because massive work needs to be done to get it to the right people.

If it were my sister, I would travel to her location TODAY with a pistol, lead pipe, and a bag of jerky because I really like jerky on road trips.

But it works, simplified, like if you owed $500 to CA but paid state XX $300, then you only have to pay CA the $200 difference.CA may not be able to get blood from a turnip, but they will suck that turnip dry before they let it go.Likewise if you, say, play professional sports for a team in state XX, live in state XX, make $20,000,000 a year, play 1 out of 20 games in CA, they want that 1/20th of that two million taxed in CA...but they will give a credit for the taxes you paid in state XX according to the interstate agreement. 

PGI was great, but now he is either too busy or just doesn't care about running his company, and I am stuck holding the bag to figure out how to transfer an existing 401k plan as well as deal with an angry ex that doesn't have her money.Buyer beware.