The 1031 exchange is a powerful tool but it needs to completed correctly for it to benefit you. 

This was exasperated when the socialist Labor Party took power in the 1950s, and raised capital gains to where the tax on ordinary income was, 89.9%.  

Charge extra to cover power  / utilities. 

Or if inflation rears it's head then you'll have jumped off a moving train with no way to get back on.The power of a 1031 is best when you stay the course with your deferred tax. 

I would at minimum find some other tools for evaluating FMV. https://www.propstream.com/ (not saying it's 100% accurate, but maybe can help shed some light) Otherwise running some Zillow comps of recently sold in last 3-6 months Hope that helps! 

Ive heard direct marketing is a good tool. 

On demand service applications - As we find ourselves more and more technology driven, and requiring an immediate response, many self managing landlords are using tools that allow them to access vendors, repair companies, lock boxes, signs, etc online.

Solar powered, well water and septic system.

What are the best/most accurate tools to determine fair market value for a property?

They have better tools and skills than you do.