Note/Tax lien purchase: Where am I going wrong?

[Michael Randle]

So I have been researching the idea of Tax Lien and notes and for ease of gathering data I have been using Miami's city run website that lists all the past due tax amounts. I am just trying to feel out how the process works and I came across the following situation and as the old saying goes (if its too good to be true...) this looks too good/easy. Where am I going wrong in my thought process here?

https://bidmiamidade.com/main

Account #:

3122020444010

Listed as Oceanview condo: 19390 COLLINS AVE UNIT: CU-O Sunny Isles Beach, FL 33160-2200

https://www.miamidade.gov/propertysearch/#/?folio=...

The lien is listed at $21.94. Yet 1/1 condos at around 1k Sqft are going for $240,000.00 (https://www.redfin.com/FL/Sunny-Isles-Beach/19390-Collins-Ave-33160/unit-1504/home/43318747).

So why would I not grab that lien, drop $200,000k into the condo, and turn around and sell if for $240,000 and make $40,000k?

There has to be some sort of huge obstacle preventing people from doing this that I am not seeing.

Help educate a newbie Note/Lien learner by pointing out what I am missing.

Thanks!