Many people usually start off with house hacking where you purchase your primary and rent out the other vacant units/rooms to lower your mortgage payments.

A refinance later will have extra costs if you maintain FHA, but be cheaper on closing costs converting to conventional later, but conventional loans usually have higher rates.

@Scott McGadden, It really doesn't provide an advantage to pay the mortgages off before selling. 

My wife and I cannot make the mortgage payment with out the rental income.

Quote from @Hunter Hanlon Taylor: I ended up using The Mortgage Shop, LLC! 

Rent out part of the space at least to help pay for mortgage and utilities.  

Hi Hunter.Hopefully I have some good answers for you regarding our doctor program.Employment start date must be with 90 days of loan closing.Min Fico 720Max DTI of 43% 6 months reserves on subject property and the other properties you own.5% down on $400k to 1.5M10% down on 1.5M to 2MWill be an ARMNo mortgage insuranceSFR, Condo, Townhome, PUDs only no MultiunitsLet me know if you have any other questions!

Real estate strategies ---> Tax liens and mortgage notes forum

I highly recommend you consider leveraging your money, meaning you get mortgages on the new properties instead of paying cash for them.

(I’d prefer you found a way to put down 20% and save the PMI as well as lower mortgage origination costs and on going interest costs.