I have investments in both the physical and digital real estate worlds.The digital world allows for greater ROI.

It would rent out for $2500 a month producing double digit ROI and over $600/month cash flow.

Not only is the replacement itself expensive but the work to dig it out and to tap into the newer system.

People have been investing successfully for decades, even when interest rates were in the double digits.

Make sure you keep a copy of the email you sent, with all of the digital info proving when it was sent, & possibly in several different format.

This is especially true with the digital nomads.

I forgot to mention that I also use Schlage Encode for my digital lock and it automates codes for each guest when linked to my Hospitable account.

& it is a tough business.However, I would rather be threatened &/or verbally abused by transient tenants residing in a building generating double digit p.a. returns than a employer demanding 70 hrs a week, while living in false hope of a 1-3% p.a. raise & the anticipation of a promotion into greater servitude.

The zip file with the digital versions of the books contains a directory of bonus files, including the excel spreadsheets work all the templates. 

If you want to yield double digit returns, investing in real estate is your safest bet.