I wrote this article a while back...maybe it can help shed some light-https://www.biggerpockets.com/renewsblog/2016/01/1...It doesn't get hardcore specific about the Zestimates, but at least things to consider.

He seems to know what he is talking about and I intend to believe in some of the things he says and one of those statements is you should never own one rental unit because the thing that you are dependent is that single unit is either 0 or 100% occupied and takes about the same physical effort as a small apartment project and according to another man I believe in is Lance Edwards who use to do that part time while he had a W-2 job that he hated and it took him only 2 years to quit his W-2 job and had no prior experience in real estate and Lance has made it in apartments and now does some teaching which is pretty normal of people.  

If we can close sooner, we will.Offers that Do Not meet these Guidelines will be REJECTEDHomepath financing is not available on these propertiesProperties sold in “AS IS” condition at time of closingPLEASE US BUYER’S LEGAL NAMES, WHAT IT SHOWS ON DRIVERS LICENSEIf LLC, will need stamped articles of incorporation pagesBuyer will need to pay $100 in order for utilities to be activated for inspections, or Selling agent may turn on utilities at Buyer’s expense with permissionFind even more information Here

I am not actually planning on physically adding a unit within the building.

I heard on a BP podcast someone say they used a physical map and blew it up and put it on the wall in their office.

Which is confusing because I'm always reading articles.

I'm not looking to get rich quick, but rather build wealth slowly so that I can quit working as hard physically detailing before I wear my body out.

If they don't want to prove they are who they say they are, why in the heck would you let them take physical possession of an asset of yours worth several hundred thousand dollars?!

Here's a real great article on the BiggerPockets Blog that talks about bigger not always being better when it comes to real estate.

Using the money, you can either reinvest into other properties or just diversify into other asset classes.I recently wrote a BP article about rising interest rates and its influence on the housing market and real estate strategies across the country.