Cost to build small multifamily buildings in Salem, OR and builder referrals

[Erik Bood]

I own an 8 plex in Salem, OR and the property currently has about 1/4 acre of bare land that I am strongly considering partitioning into a sperate legal lot to build a 2-4 unit building. I spoke to a surveyor and it sounds like it's relatively straight forward to partition off that piece of land so I can build on it. 

I have two main questions but would greatly appreciate any feedback or experience you have in this area.

Question 1: What is the approximate per square foot build cost for workforce multi-family in Oregon for a single level 2-4 unit building?

Question 2: Do you know any builders in Marion County or Salem Or area?

Even if your in different markets, I'd still like to hear what it costs you to build something like this. 

Thanks for any and all help!

Erik