Yes, Spain is one of the countries in which banks will lend to non-residents (they generally don't) but Spanish banks are much more conservative than US banks so it's more difficult to qualify, especially if you don't earn W2 income.

It's difficult to see how a tenant will be after screened and signing a lease.

If they find out they can cancel your policy (which makes getting a new policy more difficult) or if you have a claim they could deny coverage.

The agents are charged for this service no matter what so it's difficult for the agent to service from a time and financial perspective.

There are several hurdles during the process:Find the deal - Unless you are marketing or plugged into a community where there are opportunities, it isn't always easy to find the right dealsEvaluate the deal - Without professional guidance and research tools, it is difficult for a newbie investor to evaluate and ARV/FMV or create an adequate rehab budgetSecondary exit strategies - If things don't go as planned are their other opportunities to exit profitably.

A good manager will handle tenant communication, security deposit transfers, and ensure a smooth transition for you.Changing managers doesn’t have to be difficult—following the agreement and partnering with a competent new PM will help you get things back on track.

If this is representative of the construction industry around other markets in the nation and assuming many of these workers are undocumented (they may very well be legally working here, but having been through the immigration process myself, that would be difficult) the impact on construction would be massive. 

out of state is more difficult than advertised. do you already own a primary residence? 

First off, if you can find a property that cashflows, you're going to have a real difficult time getting the property financed.

Note: finding bank to finance deal seem to be more difficult than I was lead to believe.