Some kind of traceable way, certified mail, text, email. 

I’m not an expert but can share a few things that I’ve learned.Generally, the LLC is registered in the state where the property resides.

I am HVAC certified and a not practicing home inspector, so there are no issues.  

Ask your CPA/real estate tax expert.  

@Robert SimsRequest the company check be certified, i.e. payment via a certified company check.

I might be able to get you connected to a local expert.

Even though they are the expert, you still need to ensure they are a good fit for you.

You can find 20+ expert accountants on this forum.

I am no expert but some issues you might want to look out for:- Mold in crawlspace/basement (as well as evidence of running water during storms, we've seen this)- Structural damage/settling (definitely hire an expert on this one)-Improved Electrical/Plumbing (These systems DO have a lifespan and the older systems aren't as reliable as newer ones)- Asbestos Flooring and Tile (Where I am from the removal of this stuff is mandated by law to be done by a licensed professional, no DIY.

@Emma Powlin I would recommend using contractors that have earned the accreditation as a Certified 203k Contractor.