Work with your attorney for what is needed to insure all subcontractors get paid by the General Contractor.Make sure the insurance covers Construction period and also materials.Talk with your Commerical insurance agent and they should address the above questions with you.If this is an older facility make sure your engineering firm has covered Fire Suppression systems and any Storm pond or drainage systems. 

Not sure if there's a lesson to be had there, but that's how I found it.I'll say though that once you know what you're looking for and create an industry specific network, you start to find them with some frequency.

Lessons learned?

The area i chose to buy the house in isnt super popular and I have had a hard time getting it filled Lessons learned?

Great space Lessons learned?

Lessons learned we did our due diligence this time and found the right ones.

The next day we fired our PM and haven't looked back since.

Buying in Indiana and Ohio for example have been on fire over the last 3-5 years.

Lessons learned?

This provides you with a safety net for any unexpected expenses during the rehab process while also potentially allowing you to secure higher leverage on the purchase price.