Leaving the front porch light un-caulked was one they loved to 'gotcha' on..... 

That will dramatically change the nature of the wholesaling business with the legal compliance factor that agents need to comply with.

Always fix all water issues first before moving on to doing major repairs of a structural  nature.  

However, that is the nature of rules of thumb.

However, the risk of significant repairs is not to be taken lightly. 

This is a good thing if you want to do some rehab, but again, you must be very strategic about how much money you put into a place, knowing it won't naturally appreciate beyond what you create in improvements.4) We're having a bit of a zoning crisis.

Really depends on what you're looking for, the nature of the project and again, location. 

@Mike Lambert I'm curious about the nature of your investments in Mexico, geo area, type of investment, etc?

I've seen rental units get leased with iPhone photos that have good lighting. 

Add outdoor security cameras (just let guests know they’re there) and maybe some motion-sensor lights for extra safety.