It's the concept of buying the debt attached to the mortgage rather than buying the house. 

Get on a budget, build your emergency fund, pay off all debts, save up.

The technicals (migration rates, job growth, tax situation, debt cost, etc) to work as well.

The cleanest route but the least attractive method for most investors is to have the investor provide debt.

Refi after construction.These numbers consider only the portion of costs of the HEL attributable to the land purchase, not the payoff of the HELOC (which we took out to buy the Seaside condo).Cash In:                     $66,166 (Cash, 1 year of debt service of HEL, debt service of const. loan, furnishing)Amount Financed:      $548,000 (home equity loan + construction loan + closing costs)Total Cost of build:     $614,166ARV:                               $850,000 (or rather "after construction value")Refi                                $637,500 (75% of value + closing costs)                                        Cash Out                       $89,500New payment             $4500/month (54,000/year)Estimated Cash Flow (pre-tax numbers, so actual mileage may vary)airBNB year 1:            $70,000     (net income $16,000)airBNB year 2:            $100,000   (net income $46,000)airBNB year3+:           $120,000   (net income $66,000)ROI (construction year):    0ROI Year 1 of STR:              24.2% ROI Year 2 of STR:              69.5% ROI Year 3+ of STR:            99.7% Did I calculate these ROI numbers right? 

They also want a priority lien on the property.It sounds like you are looking for someone to fund your down payment, I would be looking for an equity partner over debt as nobody likes to lend money in insecure positions, especially when a borrower lacks skin in the game.How much are you planning to come in with yourself?

Did they previous take on bridge debt and has that caused them undo "pain" in the recent years?

More properties but more debt. 

If you don't meet that 12 month seasoning requirement and/or want to hold the property under an LLC, a debt service loan may be a better option.

The income doesn't really cover expenses plus debt service.