I am looking at one that is pretty modern and has 24 hr automated security and gate etc.

In general, updated with clean and modern furnishings is always a good start. 

Being interested in new technology, I decided to test the waters and purchased 1 NFT worth $50.

Or we are all wrong and modern economic theory is flawed and no longer applies...

When I lived in Southern California I worked at a firm that designed ultra modern homes in Hollywood, Beverly Hills, Malibu and so on for a homes that sold between the low price of $10 to $50 million dollars.

We have a lockbox nearby for the tenants if they get locked out but it's 2021, I hoping there is a more "modern" solution. 

You may not know the difference of the great area but look at the photos, and try to stick with: kitchen is modern, has heat and air conditioning.More time consuming but also free: call a couple property managers in given city; US census detailsPaying: rentometer; rentguide; insurify; 

For hands off if you want a more traditional broker than Vanguard or for a modern one M1 Finance.

I'm part of a mastermind that leverages technology to help new and experienced investors close more deals.

You may have old sewer lines, old wiring, asbestos, lead paint, rubble foundations and various things that fall short of modern code.