I tried to get a loan against the property, but I could not find anyone that would do it.

Yup, plus different markets allow separate second home loans. 

Hey @Daniel Loane, so what I might do is to separate the 2 units.

I would estimate that we would have to carry the construction loan for 6 months before we could rent it for $1600 - $1800 a month.

If you have a loan, will the lender let you get by without it?

I am not licensed for consumer loans in ID (I can do investor stuff all day long, but not consumer in ID), so I can provide impartial advice.

The one issue is that you can only purchase real estate "Cash" in general as most lenders won't let IRA's take out loans, but I've seen it done if the deal is right.

The types of creative financing options I was looking into were a lease option/lease-purchase agreement, loan assumption, wrap-around mortgage, and subject to financing.I guess my question is...

Hey Rajshekar, I'm a big advocate for Detroit and own 14-doors there.I just finished a duplex and am closing on my DSCR loan this week.

They have an inquiry form that asks for a budget (and provides an example of $10,000 a month).