Note to self - always go with a larger company who will be around for the long haul.

As long as the locational characteristics, including zoning, appeal, school districts, etc, are similar.So, yes, you're argument may be reasonable.

Once the rehab is complete, you could then use the 30-year fixed DSCR loan to refinance into a long term loan. 

George - I think that the owners most likely to seller finance a portion of the sale are those that have owned their property for a LONG time (potentially looking for residual income) and owners than own their property either "free and clear" (without a mortgage/debt) as they have more flexibility.

Analyzing these properties, I knew my only option would be a long term rental.

It's a #1 indicator of long-term financial stability and net worth.

Does anyone know of a lender who specializes in lending money for long-term government-backed deals (public of private lenders)?

If you're looking for long-term, We have investors from literally all over the country buying these new builds.Horton has been offering all sorts of $$ towards rate buy downs, upgrades, closing costs for months and its definitely hurt re-sells.

Are you planning on holding those long term? 

The Long Game's working well for you @Mike Reynolds.