So now the insurance company has finished their investigation. 

I am still investigating a few of these items but I will answer what I know.1.

Most of what we've investigated has been entirely residential, so we are looking for a project manager or engineer in Southern New Hampshire who might have experience in this area. 

We are hiring a private investigator and as I stated I will not stop.

The Agency’s investigations are complaint driven, so we rely heavily on the public, and our licensees to bring these individuals to our attention.

Should I stick to using COC & monthly cash flow as my metric for whether to investigate a potential property further?

Account Closed said, you keep track of that travel and those expenses could be added to the basis of the property if you have identified the property before making the trip (Just the market investigation trip is not added to basis) Flipping and development: You could possibly deduct the travel to another state if you have a flipping business: 1) Flipping business is reported in the Schedule C or as an ordinary business activity if you have an entity, and travel cost to acquire the other properties can be deducted if planned property. 

I wholesale so I don't need my license and I was able to clear it up with the investigator.

Once you get the list of parties in interest, the real investigative work begins. 

I would however thoroughly investigate any tenants record.