This is really unusual and does not happen every time.Good Investing...

That is why it is unusual for them to hassle residential contractors.

Now that's unusual, too.

The only information I've been able to get is that it isn't unusual for it to happen. 

Yes, sometimes, if you are buying a property that is obviously going to be flipped/ rehabbed it is likely the seller will have several cash offers if the price is right, if the property is priced unusually low don't expect a discount either. 

It’s weird and unusual, but you don’t absolutely need the help of the lender to payoff and reconvey a loan.This is your first post and your profile is blank, Yin, so there is no way to know your background, level of understanding, or sophistication.

So, it isn't unusual at all.

A $4-5k rent is not unusual here....so it can be $10k to move in. 

Some aggregator sites don't differentiate between condos and co-ops so you could be looking at a co-op with an unusually high maintenance. 

It is not unusual for there to be significant problems I think especially in the sewer lines in old cities and many Philly residents have had to spend thousands and thousands of dollars to repair their lines.