It'd just be a shame for you to sell a building and pay tax only to then reinvest your net proceeds after tax in buying your first pieces of investment real estate.  

I am in Tampa Florida so the investment market is huge here for both as well. 

He is correct that a single ADU in a single family zoned area is unlikely to return as much as the hands off cost and is one of many reasons that adding a single ADU in most single family areas is not a good re investment.  

Quote from @Laurens Van swol: We are exploring the possibility of purchasing an investment property in Florida.

Nope, time to read a book on RE!

Look at buying my first investment property (probably a house in the 100-150k range) and begin looking for a tennant.I can imagine there a lot of different theories/ideas with what one could do here--I am just curious to see what other people think.

Hopefully your lease has a clause that addresses owner re-occupation.2.

My name is Enzo, I'm 19 years old and I have about $12K on hand, continuing to work full time, and looking to get into real estate and begin building my portfolio ASAP. Any advice from pros as to what I should absolut...

Congrats on this investment @Kai'ler Sato ! 

Or if you are able to connect to public water &  sewer, this would make the investment much easier.