Financing a Real Estate Development Deal/Duplex in HCOL area

[Kristen R.]

looking for creative ideas/recommendations on how to finance a lot purchase/duplex build in a high cost of living area (mountain ski town)... plan is to turn and sell 1/2 the duplex for a good profit which will payoff approx 70% of the total cost of the land + build. then re-fi the remaining into a traditional mortgage and use the remaining 1/2 duplex as an investment property which we will do as a STR partially and use as a vacation home.

we'd prefer to not collateralize/heloc our main home and rental property (currently only have 1).