Nobody I've seen either 1.) documents documents their ROI against risk or attempts to 2.) quantify the "alpha" of their systems.That said, what is more indicative of a "guru" designation is a self-promotion and advertising.

Extremely hard to quantify this.

The million dollar question is how much the upgrades are worth, because that is really hard to quantify, and think you are right that it helps get it rented and retain a tenant more than command significantly higher rent.Given your response, the next time I had a vacancy I would raise rent $25/mo.  

Some benefits aren't not the tangible and quantifiable type that can be easily captured on a spreadsheet.

Math is math, and if you have good numbers and plug them in, the resulting figure will tell you all you need to know; nearly everything about a rental property is quantifiable, even if you have to use estimates rather than hard facts in some parts of the equation. 

See if you can identify and quantify the issue.

Charlie, were you able to quantify how bad the local impacts were?

You have to quantify for that return in your area what you will have to take on to achieve that.

It sounds like it will be mainly for investing purposes - great, you may not need a conventional brokerage (KW, JSCott, Bain, Wind etc) Find one locally where investors are involved - not all agents (very few) understand investing.How to start: Run the hard numbers, grab a spreadsheet and call the brokerages - plug in the hard numbers and then quantify the soft differences (investor mindset, training options, brand advantages, CRM options?)

I would run the numbers then like the property is vacant and has no income and the numbers cannot be verified from what is stated but that is just me.If I can't quantify and verify something to be true then there is a huge risk and unknown going into a property.