We are in the research phase right to figure out the best way to structure the entity/partnership. 

@Brandon Swartwood There are several methods to calculate the property value.

These are public record and there is a GIS Database (Portal Catastro Digital y Productos Cartográficos (crimpr.net))where you can access this parcels to see their "Catastro number", owner, area, the assessed value for both the land and the structure for tax purposes and you should also see the date of the last sale and the price.

They have couple cool projects in Dignowity Hill, and a pre-fab structure at Broadway News ( camerarenting.com), but most of their stuff is one-offs out in the Hill Country.    

Leverage is the method investors use to increase cash flow.

-Look to find out what’s really important to the seller and structure your offer so it aligns with that

Which is the safest structure while also being simple and easy to manage?

I want to structure the partnership correctly so that everyone's assets are protected.

And what are some good methods of advertising in general?

Depends on the structure of the property, it might be possible to convert to 2/1 + 1/1 but would need to go thru the City of Portland approval and to get permits to do so.