The accountant offices focused on international clients will offer the possibility to register your SL at their address for a compensation (yearly or monthly).Regarding these other services, like mail handling, phone assistance, etc., I would advise you to try to manage it yourself to slowly understand the Spanish system.

A written job offer detailing pay.

I made a relatively low offer and after one negotiation we settled on a price that was about 45% lower than the original list price.

The worst part is they refuse to help me get the account back, quoting their terms of service and stating they are not liable for any issues with my account. 

Look into a DSCR, Debt Service Coverage Ratio, loan where the rental income can be used to qualify the cash out refinance instead of your personal income.To Your Success! 

There are some great suggestions here on down payment, interest rate, servicing, and underwriting the borrower.  

My bank connection breaks multiple times a year, and we are going on 2 months with no offered solution from Stessa other than they are working on it. 

My only complaints with their customer service are 1.

You can put a mortgage into a "trust: without triggering a due on sale but again contacting your bank/lender is the best route to avoid any issues.Some banks/lenders or servicing companies change guidelines and even a trust may require other paperwork but the attorney usually facilitates that to be safe.  

I just talked to two banks and they both said that they don't offer them for investment properties.