How big of a lot is required and how much would it cost to purchase?

Unless the purchase price of the original sale is fully disclosed, and even then, some underwriters require that you actually have your deed recorded with consideration thereon in the public record before they will close a second sale.

They're a conduit lender, so they require more documentation than a mortgage fund or private individual would request. 

It helps for warranty claims down the line.For GAF shingles, the 25-year warranty usually requires online registration.

I am assuming that most lenders require 25% DP. 

I think getting your real estate license is not required for investing in real estate, but is very helpful.

Notably, there is often an unfortunate cycle where: (1) current ownership has financial struggles; (2) this requires the current ownership to fire sell or declare bankruptcy; (3) the development suffers as a result; (4) new ownership comes in and tries to fix it; and (5) the cycle repeats.

If you ask the manager to justify a fee and he starts hemming and hawing, move on or require them to remove the fee.

Addressing criticism about high rental rates in gentrifying neighborhoods requires empathy and transparency.

Quote from @Kar Sun: It appears the law requires you to allow them to attend, inspect together, and mutually agree to a list of damages: https://codes.findlaw.com/tn/title-66-property/tn-code-sect-...Print that off and follow it.Make it clear to her that she is not permitted to bring guests.