You may not need "2 years of work history" either depending on the detailsGenerally speaking there are 2 main types of loans for investors: “Conventional” and “Portfolio”Conventional - I'll define these as loans that come from Fannie Mae and Freddie Mac (if you recognize those names).

Stay hyperlocal and get a good team in place locally so you can recognize good people when you find them. 

First recognize that 2 to 4 units are valued on comps and not cap rate.  

You want to use a contractor or repair man with a proven track record. 

Banks need for them to build recognized credit before doing an FHA type loan.

@Colleen A Levitt check if you have a prepay penalty and what the seasoning requirements would be for the new loan to recognize the new value.

Death by 1000 cuts.virtually everyone recognizes that placing all eggs in one basket elevates risk.  

In a service business like property management, your contributions can go unseen at times - so I feel as though value is harder to recognize, so you need to really exceed expectation in order to prove this value!

Find a proven strategy and focus on that.

It may work in the long term but can be a painful process.i wish the OP the best and i believe he can benefit by recognizing the value in the various responses but seems unwilling.