When it comes time to adjust rent, do so, especially if the tenants annoy you. :-)When I bought my first multi-family (also a 4-unit) the upstairs units were vacant and the two downstairs units were occupied.

Maybe some mild annoyance to the creditor/plaintiff but any lawyer can deal with it if the underlying liability is large enough. 

Disappointed that their so-called experienced agent isn't giving them better guidance as well.In the end, it's annoying but not catastrophic if the deal craters, I'm more interested in how to prevent it from occurring again, thus leaving the home off the market unnecessarily.

This is an unbelievably annoying practice. 

Fortunately none of this sounds like a very expensive problem to have, but nevertheless it's still an annoying problem

If I’m looking at properties Rn on Zillow just to practice, don’t you think they’d be annoyed if I had contacted them when I’m just looking at random properties to practice?

That's why I'm silently annoyed when I read of people looking for investor friendly title agents. 

These regulations are annoying, but in many cases have required owners to repair and renovate these beautiful old buildings that may otherwise have fallen apart.Taxes are high, but rent and incomes are high too.

Just let them know that if they want to sell, you're interested and are hoping you all can come to mutually beneficial negotiations.By now, they may no longer be getting letters from investors, so you may have a shot, if you don't turn them off with annoying sales tactics. 

Well, perhaps there will still be a way to make an offer they can't refuse, and still make a nice profit without having to deal with a bunch of annoying heirs.