My approach was to partner with a GC, so he handles the rehab estimates with his years of experience.Another option is to read J Scott’s book on estimating rehab costs.I've heard a lot about this book.

New investors get way too stuck on LLC setups and the like when they really don't have anything worth taking, and those with loans have partners that provide some buffer anyway - the bank, who's going to end up with the property if anyone sues you successfully enough to get a judgement, which means it will be the rare attorney who even takes the case. 

Also, when picking a lender, make sure you pick one that is very familiar with BRRRR strategies, has access to hundreds of lenders to shop the best Hard Money and Refinance partners for you, and that can give you advise on the front end.  

This dynamic needs to change and hopefully difficult times like we are currently in will force limited partners to demands more transparency. 

After a long search, I found the right trustworthy Mexican partner/builder which has allowed me to work on doing my own condo developments to enable to give a better deal to the buyers, including people who contacted me on BP and couldn't find something that suit their needs.

Great tools that get updated regularly.I am on the lending side of things and would be happy to hop on a call with you anytime to discuss financial strategies and help answer any questions you may have about nearly any loan product available to help you on your journey, even if they are not products my capital partners offer.We are all here to help you learn and grow.

While I secured the initial financing for the property, I have two other partners/groupings (a total of 6 people) that are contributing to the closing. 

BiggerPockets recently partnered with them. 

Prepare for the journey by partnering with an investor-friendly agent.Good luck!

Great tools that get updated regularly.I am on the lending side of things and would be happy to hop on a call with you anytime to discuss financial strategies and help answer any questions you may have about nearly any loan product available to help you on your journey, even if they are not products my capital partners offer.We are all here to help you learn and grow.