So large, national, publicly traded banks are out. 

The tenant built the building and are strong national tenant. 

Adriana,Check out the National Assocation of Residential Property Managers website, look under find a property manager.

Most towns are very resistant to adding/expanding mobile home parks.

I've been investing in CFD's for about 2 years now and had some out of the park home runs - I'm taking like 300% return on my money and some I've lost on because when we took the property back it was in such bad condition.

In my mind, Portland has many similar advantages to San Francisco - geographic constraints to spreading (rivers, mountains), difficult development requirements, a young workforce and better than national average population growth projections, and a "coolness" factor with tech workers and millennials that one can't simply create by declaring oneself a tech hub. 

Oregon state wide rent control law, first in the nation…discusshttps://www.housingwire.com/articles/48325-oregon-enacts-nations-first-statewide-rent-control-lawhttps://www.cbsnews.com/news/oregon-rent-control-law-puts-a-cap-on-massive-rent-increases/

You will have some national lenders that offer a loan type that you are describing but I think the best ones will be from local lenders. 

They usually require you have a lease in hand with forward commitment from a strong regional or national tenant.

Mind you I want a small park, for some a small park wouldn’t be worth it.