He closed off all the holes and ways in for them except one, that one he took a stiff fiberglass netting and created a downward tunnel from the hole, this allows bats still inside to fly to the hole then fall down the tunnel and out, others could not re enter.

There will be stiff resistance to changing the system as big bucks are involved.

If you don't trust them enough to be liable for their rent (knowing that they wouldn't stiff you), don't move in with them!

From the start of TRID this has been an issue and we prepared buyer-side and seller-side CDs only and lenders were facing stiff penalties for violations. 

In the age of acrylic and fiberglass tubs, there are a large number of "professional bathroom designers" who either do not know this or make up total BS excuses for why they choose to stiff you for an additional $100-$200 on materials costs for the "cast" versions of these steel tubs (because they're easier and faster for unskilled people to install).Here's an out-of-the-box idea on your shower, invest in a European shower bar mixer system where most of the plumbing is outside the wall.

I just bought a 2nd home/Airbnb in Lake Arrowhead and I can tell you the competition is very stiff and the market definitely seems saturated.

Be prepared for stiff competition. 

@Andrew S.I have had tenants stiff me on rent and done damage to my properties.

Some people are just bums, and are going to stiff you on your money, destroy your house, and have the police break down the door.

This should not happen often with a properly screened tenant.Now if I assume you have a dilapidated unit, packed with awful adult tenants in the unit and they have pets, they pay late every month, damage the place, and stiff you on move out, I come to around 10 hours of work during the year.