Not sure what the statistics are on abandoned buildings, but there's way too many.

I ask this because In 2015 I claimed every expense possible and it saved me alot of $$$ on taxes, but in the end it had a negative side effect when applying for another mortgage on an additional property. 

With a cash flow negative property you have to do some kind of forward projection or the property will likely continue to deteriorate to the point that even free does not work.

I would prefer a company located in the US, and with English native-language employees, simply because I've heard so much negative feedback from colleagues and friends about companies using non-US-sourced companies.  

It may not be negative, it may just be being careful.

I look at cash flow over the life of the investment (not just day 1, but over the life including average historical rate of rent increases) and appreciation over the life of the investment (not just next year or the year after, but over multi-decades, based on job and population growth, housing supply & demand statistics, and long term historical averages of price appreciation).

This negates their ability to double debit you or claw back the funds.

One way to interpret the data is that high household debt indicates negative pressure and an inability for people to pay their other obligations.Mortgage is the 3rd most popular form of debt.

I was stuck with a house under water and negative cash flow every month.I've since learned that it is important to know that you will be able to have positive cash flow as a rental property after you have to move, regardless of which direction the market is going.

Do you ever fear how the days on market could negatively affect your listing?