With this approach u don’t need to ever worry about running out of money.  

Keep in mind this is just the approach that aligns with my goals the best, which is to build wealth to reach financial independence ASAP!

I'm also approaching the 20th. 

The seller doesn't want to approach the tenants for new leases or an estoppel agreement which is rather strange.

Try going on a "break" with that realtor and look specifically for one who not only understands investments but who also has good technical acumen for exporting and doing deep analytics on the MLS data. 

I have decided to sell my duplex but before even listing it because I am getting some minor touch up and repairs done, I have been approach with an offer.

This a value-driven approach.  

@Bill Fitzgerald I do not have a financial background but I believe I have a different approach than the average Joe when it comes to managing my money.

Then take some time re -strategize your investment approach with the new capital.

Also keep in mind the additional tax benefits of this option and that the property pays for the expenses, taxes, insurance, etc, not you.I like your approach in being proactive with your property manager and having a discussion.Finally, and maybe most importantly, what would make you happy?