For instance, I have a home that we rehabbed that was assessed at $11,000 but its ARV is about $125,000.

Consider the amount of the mortgage that has been paid down (and by extension, the amount of equity that has built up!) 

Perhaps more consistent for him in that instance?

For instance, after a hurricane prices go up typically.

For instance I did one last Feb.

You could do that, but some Realtors don't like dual representation, it can put them in a bad spot, so in those instances, you might have you own agent. 

From there, you can figure out if additional benefits can be achieved via real estate professional status or the short term rental loophole for instance. 

For instance if you have one $500,000 property with % equity and the market goes up 3% you have gained $15,000 in equity.

@Josh Mac keep in mind that Zillow can be completely unaware of factors that affect value...and some of these factors might not be apparent until you see the property in-person.For instance, maybe someone added a bathroom to the house, and now it's a 3/3, but Zillow thinks it's a 3/2.  ...or maybe the house is right next to a busy road with tons of traffic noise, but the Zestimate is based on nearby houses that are on quieter residential streets  ...or the main floor beam under the house is rotted out--Zillow would never know that...In short, there are a ton of factors that can affect a property's value that Zillow might completely miss.The Zestimate can be reasonably accurate in showing a ballpark value...but, I wouldn't make life and death investing decisions based on a Zestimate...

However, life can get complicated, and if you find yourself needing more time to gather your documents and complete your tax return, there’s an option available: filing for an extension.Understanding the Extension ProcessTaxpayers who require extra time to file must submit a request for an extension by April 18.