We found many, many articles discussing this issue, training websites selling their certificates and people sharing their stories. 

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Great topic!

Here's a BP blog article I wrote on Why, When & How to Get Permits

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/

If so, you need to do your research on these topics so that you're an expert before you put together any loans for any clients as there is a huge liability in brokering loans. 

@Chihiro KurokawaGood topic to discuss and thank you for bringing it up! 

There have been a lot of discussions on this topic, and an easy search will give you more than you would want to know about it.

Just PM me or email me.Average Cash Flow Per Door In Phoenix Metro Areahttps://www.biggerpockets.com/forums/600/topics/584916-average-cash-flow-per-door-in-phoenix-metro-areaand this one I did just because it's interesting to see another angle of investing:How I buy houses for pennies on the dollarhttps://www.biggerpockets.com/forums/311/topics/67...

As @Jay says it's more a matter of integrity and having the funds in case everything goes wrong.Here is a Subject To I did in Mesa as an exampleHow I buy houses for pennies on the dollarhttps://www.biggerpockets.com/forums/311/topics/67...