Recent sale of the assessed property is de facto value.Expert is needed for anything else.They can raise the value if you appeal.Comparable sales only count if they were closed before the lien date which is one year prior to the tax bill date.

So you would need to refinance, payoff or sell before the maturity date. 

A few notes on your comment to this aged post thread to shed some additional light since you don't know much about us...Aloha Capital has funded over 3,000 loans since 2015 on nearly 1 billion of residential investment properties and to date has ~ 0.4% default rate.

Start talking to lenders now, but wait to get pre-approved until you have a job offer with a firm start date.

Their insurance has asked me to return the month's payment for the remaining days of their rental (Unfortunately, I did not have a cancellation agreement).I am unsure how to handle this situation, especially since I couldn't fill the majority of the rental dates and had to offer discounts for the days I did manage to book.

Researching on Google, watching YouTube videos, and reading articles I found on the internet regarding the topic I was interested in.

Of course, that was after we missed the closing date.

As soon as you know your final funds to close and the closing date, call whichever credit card company(s) that you'll be using and let them know that you'll be making a pretty significant purchase within the next few days.

Also, good idea not to put it out there on the internet that you have that kind of equity, that will just attract more scammers!  

The owner still has redemption rights for a period of three years after the tax deed date.