On the other hand, if we build, we don't know how well new construction would perform in about 12-14 months, considering we would be building to rent. 

Working with an investor-friendly agent who also owns rentals, and who partners daily with property managers and contractors, gives you the most eyes on the ground.

Talk to the city planning departmentLiterally ask them:“What would the city like to see on this parcel?”

I have contacts for couple of agents but I welcome any recommendations as well.

We're undergoing renovations for a few units at an apartment complex and would love to hit the ground running.

I have learned a tremendous amount from this community and these forums, as well as connected to some great people.I live in Vancouver WA and am a licensed Real Estate Agent for WA (soon to be OR as well :] ) and also am actively looking for investments primarily in the Multi Family space.

A friend likes to says, " Old properties have new problems." 

For scaling, you could look at strategies such as  joint ventures with local partners who can handle on-the-ground management.

It's expensive but you won't know the markets as well as the local investors.

ground-up development seems like a difficult way to begin.