Patience and persistence truly are the ultimate secret strategies!

Even if this rehab GC works for free it could ultimately cost you more in time or problems that crop up after the build is completed. 

Start with BiggerPockets Ultimate Beginners Guide (free).

They do provide training, guidance, and mentorship.... but ultimately it is up to you to get deals done.

They sell product only in many cases, and if you are working with someone you must apply some critical thinking and skepticism to their advice and see if it is in your best interests.I frankly get annoyed when I see and hear comments about high compensation of insurance agents as an argument against using it, as that is really not relevant if the ultimate solution is good and valuable.  

Start with BiggerPockets Ultimate Beginners Guide (free).

Take my advice for what it is worth - I ultimately decided not to invest there.

This can often lead to bad purchased since neither focus on the fundamentals of the underlying real estate which is what ultimately drives value, appreciation and net profit.

Start by reading the Ultimate Real Estate Investing Guide: https://www.biggerpockets.com/guides/ultimate-real-estate-investing-guide/introduction2.

The only exception is if a tenant fails to provide a written forwarding address: landlords then need not return security deposits or provide a notice of damages until fifteen (15) days after receipt of a forwarding address in writing.Option 2 is to just send it to the last known address and for to ask the post office to please forward it to the correct address.If you ultimately cannot mail the payment or they do not cash the check, you will need to eventually send the money to unclaimed property:"Unclaimed property is held by the Treasurer until the rightful owner comes forward to claim it.