No, using property tax or assessment data is NOT a good way to determine the resale value of a property.The only good way is to do a thorough analysis of sold comparables in the previous several months and within a small radius (less than 1 mile, ideally).By comparable, we mean:- Similar size- Similar construction date- Similar condition- Similar construction type- Similar # of beds and baths- Similar surrounding area (for example, is it in a subdivision or not)- Similar amenitiesIt sounds like you don't yet have a good grasp of how to analyze comps, so I would recommend doing some study in this area and/or finding someone qualified to help you out.

I've got one duplex so far so I'm starting to get a better grasp on all the other costs it takes to run a rental. 

It sounds like you have buyer's remorse and are grasping at "legal gotchas" to get unwind the purchase.In my state, it's buyer beware.

No matter how often I show these pics, No matter how much proof I post, for some reason people just do not grasp how important this concept is and they brush it off as not realistic.I have ranked many a sites#1, not just my site:in markets like southern cali, and dallas...I am an investor just like you.. ok maybe not JUST like you..

I had enough minor issues selling with an agent to try it on my own several times and now I have a fair enough grasp.

I have a pretty good grasp of running the math on properties and have found that a large chunk of the properties here in LA are cash flow negative, due to the sky-high prices.

Using a brokers time would actually be the best way to get a grasp of the basics I feel, maybe you could pay him for his time?

In Colombia you have to put a lot of legwork and research to get a tight grasp on valuations due to everybody “knowing everything” there.

Once you understand the actual REIT is only follow the actual income then it's "easier" to grasp the idea.All in all , 1031 to STR somewhere in Mountain or Hawaii is still way way better -- or 1031 to rental to primary ; than a complicated DST/721.

I am taking it all into account to try get a better grasp for the Austin Market.The more tips and advise the better so keep it coming ...