I was not impressed as they would not provide any references for reviews, they sited privacy concerns, which I thought was unusual. 

It seems like a great way to get near unbeatable cash on cash returns.I am seeing $60-70k 3 bedroom houses that would rent for maybe $600-700 to a regular tenant but section 8 HUD FMR pays $1100 so they are cash flowing $500/month.

That is where most of my investments are and my smaller experience based cabins crush it compared to my regular SFH that I rent.

Oregon has capped rent increases at 7% + CPI (10%) max for future reference as well. 

The second reference, Publication 523, gives 2 key bits of information that I've never seen anywhere else, and certainly not on Section 121 itself. 

Although you can't look up criminal history, you can get landlord references from other landlords with whom they have worked.

I'm expanding into the world of tax lien/deed investing so will need to be conducting title searches on a regular basis. 

You can then qualify for a Solo 401K and contribute to it a lot more than with a regular 401K.

@Jeff EbertRecommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder (BiggerPockets: The Real Estate Investing Social Network), etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

Reference : https://www.tiktok.com/t/ZTNs32kbD/also how to know what are zoning restrictions and state code if they adhere to or not ?