Financing 2nd property with less than 20% down. Suggestions?

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I currently live in a duplex where I live in one half and rent out the other. It is financed through an FHA loan. I have about 5% equity in it.

Goal: get the next 2-4 family .

Original plan: improve, raise rents and refinance to 20% equity conventional loan and hopefully get some cash out to use as down payment on next one.

I bought a duplex with rents that were waaaay too low and had to finish rehabbing one side. I lived in the non rehabbed side and completed it overtime and literally doubled the rent on the other unit. When I bought it it was rented at $750. It's a 2000 sq ft 3 bd 2 Ba with granite level finishes. As soon as their lease expired I rented it for $1,500.

I finished the rehab, started working on refinancing, and hit a road block. There are literally not comps for a 2 family like this in the area. The appraisers saw a couple comps for 2-families half the size that are run down and give me a number slightly higher. I've talked to 3 different appraisers now who all say the same thing.

So if I can't refinance at 20% I need to look for other ways to get the next building. Here are my hurdles:

- I can only have 1 FHA loan with less than 20% down. I have $10k to put down. Potential properties range from $150-250k

- thought about refinancing my current duplex as individual units. Comps on the units as condos appraise out MUCH higher than as a two family. Lenders kept saying it wouldn't work though

-I can get a conventional loan with less than 20% down but only a single family :(

What ways can I finance the next one? Any suggestions?