what if one starts tormenting the other but always pays rent?

Well, a foreclosure does not evict someone living there, you need to evict them.So in most cases you start the eviction.

If you can't stomach putting cash up front for building an apartment building you either need to find something smaller to start with or get out of developing.

I just don't know how much.genuinely open to your perspective and hoping to start a potentially fruitful dialogue. 

Issue appropriate notice immediately whenever the tenant breaks any of the terms they agreed to in the lease, which starts the process and shortens the timeline if you need to take the next steps towards eviction.

@Kunal Lakhwani I have never heard of Twin Cities Leasing, the name makes me question there actual service focus and my gut says it's less about PM and more focused on listing biz, which is problematic, especially in Saint Paul, but again I don't know them off hand so do research and ask questions of them. 

How to get started in it. 

I noticed that these buyers don't want a scripted conversation, so I would start the call by introducing myself, "Hi (their name), I'm a wholesaler looking for an investor like yourself.

Securing private funding can be challenging, especially when you're just starting out.

House hacking is a great way to get started.