Now imagine the tenant not fixing it due to lack of knowledge and/or money.

Use other people's knowledge.

For you, if you do development and new construction, perhaps just a blog showcasing your knowledge would be helpful.

That way, he gets the commission and you get the knowledge you need to be able to do it yourself the next time.Another alternative is to agree to give him 50% of your next 5 listings, with you as the co-agent.

Do you have some inside knowledge about it or something?

Did he get the entire property or did someone only convey 1/2 the property.Abandoned properties often require almost as much knowledge in real estate law as your title co or an attorney would have.

The more knowledge you have of your market, the more comfortable you will be.

My knowledge is that they focus most on multifamily properties.

There is an abundance of free knowledge you can get on the site.

Rather than wasting your time, and tha of a prospective mentor, "follow" those that stand out from the crowd and when comfortable doing so, make contact by "request" and take it from there.Its very important to remember though, that everyone is here by choice and are offering their knowledge and experience out of the kindness of their hearts.