I thought Portland, OR was a high cost of living area. Have you looked at what your return on investment will be yet? Have you applied the 1% rule?
The 1% rule - The house should rent for at least 1% of the acquisition price (purchase price + fixing up) to be a worthwhile rental property. If a house is Portland costs $500,000, it needs to rent out for $5,000 a month to be a candidate as a rental. Same with multi-family on a per unit basis.
This is a simple formula, you do more complicated math later to figure out the actual expenses and actual ROI.
Multi-unit seems to be more popular these days. It's like a real estate "fad" that everyone is doing. I personally own 20 single family homes in Alabama (low cost of living) that are doing. I'm a real estate blogger.