@Herve FrancoisThe participant loan feature of the Solo 401k might work in a pinch (if you are looking to use the loan proceeds rather than make them available to the 401k), but there are limitations.

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Now I'm using an app called Tellus and really like the feature which could automatically collect rent for me. 

I like the search features: https://www.biggerpockets.com/searchAlerts can be really helpful too: http://www.biggerpockets.com/alertsThere are a few self-contained guides that you can access here: https://www.biggerpockets.com/guides

Experts estimate that around a third of all American adults have a credit score below 601 (https://www.foxbusiness.com/features/how-many-americans-have-bad-credit) and so are considered a poor or bad risk.

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I like the search features: https://www.biggerpockets.com/search

I like the search features: https://www.biggerpockets.com/searchAlerts can be really helpful too: http://www.biggerpockets.com/alertsThere are a few self-contained guides that you can access here: https://www.biggerpockets.com/guides

Tenant wants the building, location, size, features, etc.