If you invest in rental properties than now is actually a very good time to buy additional units. With so many people who suffered the loss of their homes in the down turn, they are predicting a shortage of availability in rental units and for rents to increase in conjunction. The expectation is for a strong rental market for the next five years.
I have seen many multi unit, bank owned properties at great rates. You can investigate the Boise Idaho area and search the Boise Idaho Area MLS to find options that may work for your investment interests.