Tell me the steps regardig -how a non US citizen can buy a permanent home for living purpose ?

in hearing you the only thing that would concern me is how little the bed bugs have cost .. our experience with bed bugs is we have never paid less then $1k  to get a house properly treated and the only proper treatment legal right now in NC in heat treatment bc there are not sprays that work to permanently rid bed bugs.    

Per my landlord, the applicant wants to rent the apartment for 4-5 months (not live in it much) after which he will be relocating to Milwaukee permanently but to a different location.

Story, United States District Judge for the Northern District of Georgia, entered an order and final judgment permanently enjoining Charles William Petty, II (“Pettyâ€), Visionary Publishing International, LLC (“Visionaryâ€), and Virtual Properties Worldwide, Inc.

There isn't any permanent solution, tenting is required every 7-10 years.  

Just no payments due and a principal balance that stays flat.A deal can be done when both sides want to make the deal work.You might be over your head with this deal as you are new to multi-family, the building is going through a conversion from offices to residential, the property has no useful history and the mortgage market is an unknown as it will be months before you can get long term permanent financing.

The fha loans require 3.5% down but the mortgage insurance is permanent on these so try to avoid fha if possible .

This would be a 6-8 month break from my regular career, not a permanent hiatus. 

My advice is this...never let a temporary change a permanent. 

The monthly rent on that house is only a few hundred bucks more than the mortgage payment (as you would expect with a no money down loan), but I try to take a longer more permanent view of my investments.