In those cases, you may be faced with the question of how to enter a property – and a potentially dangerous situation - on your own.

If the tenants themselves are not the dangerous sort, just messy, I would give it a shot to work with the tenants in turning this around.First, secure the property and try to negotiate a good deal from the current owner as you will be taking over their "problem".

Reading the basics and thinking you know the answers is very dangerous in my opinion.  

safe/dangerous?

The cost of a build is so variable in it's many components, using this number for decision making is flat out dangerous.

There is a danger of just trying to learn more and more and more without ever doing.

But, at the same time, there have to be areas near you which are not dangerous and which still do have 2, 3, and 4-unit properties.  

I just posted over in the Landlords & Tenants Forum about the Dangers Involved in conducting an eviction. 

We wouldn't do the 50/50, I would simply tell them that they have to pay for the inspection and if it comes back with dangerous levels of bad mold.

. - Even as part of my management company where we managed over 400 rental houses, unless it was a true emergency such as a broken water line, dangerous electrical hazard such as sparking lines, a gas line leak, etc we did not deal with emergencies in the middle of the night.