Per Cathie Wood's ARKK Innovation strategies, these are the tech revolution area for next 10 years:Deep Learning ( Nvidia, Google,FB)Re-invention of data center (Cisco, Junipers)Virtual Worlds (Microsoft,Apple)Digital Wallets (Square, Paypal)Bitcoin (paypal/Visa)EV (Tsla/Nio/Xpeng/QuantumScape,Blink,Chargepoint)Automation (Apple, google, everybody)Autonomous Ride Hailing (Uber)Delivery Drones (Amazon)Orbital Aerospace (Nasa,Lockheed,Spacex)3D printing(HP)Long read sequeincing (Genentech)Medical Robotics (Intuitive Surgical)Cell and Gene Therapy ( many startups)All these companies has HQ and research facility in Bay Area.

In Florida, your wind/hail deductible will already be extremely high so your pretty much self insuring the roof anyway.

There are some hail-Mary type long shot creative ways, but I don't see that happening remotely.

He has no COs so you are not obligated to pay and no judge in the world would do anything but laugh this guy out of court - or throw him in hail perhaps...I would be on the phone tomorrow with an attorney, and DO NOT pay the builder anything else unless the attorney tells you to.

If the property values in your market soften, if the tenant moves in and destroys it, fire, earthquakes, floods, hail, hurricane, another lock down requires you to keep a non-paying tenant - honestly anything - and my position in the property is at jeopardy.

As any owner, you have a duty (per most insurance contracts) to "maintain" your roof and even replace it once it gets so old (especially if it's never suffered any significant wind/hail damage). 

Quote from @Matt Haile: Quote from @Robin Simon: The numbers make sense but... what kind of loan is the mortgage going to be?  

It won't get damaged in a hail storm and will never rot.

You could buy a house for $200,000 but maybe it would cost $300,000 to build it new again.Consider a few common scenarios and ask the insurer what it would pay: kitchen fire and you have to renovate, roof damaged by hail storm and requires replacement, or house burns down and you have to rebuild.

Next on the list is exterior paint, wood repair, new roof due to a hail storm... and landscaping.