Many groups have transitioned their meetings to online platforms so take advantage of that and go to some of the online meetings

Consumers and companies will still need to buy, sell, and invest in real estate, and they're spending a lot more time online. 

I've had at least 4 prospective tenants show interest and then when they get the lease agreement online on HelloSign, they ghost.

I am an investor living in Hamburg, PA.

It depends on what you signed (or what they are asking you to sign).If you don't have experience in PA, I would get a lawyer and/or your own broker to have them guide you through the process.

You can also look online in many places to see court records and see if he filed other suits or if other people filed suits against this current landlord.

This individual is targeting BP members' businesses on Google. He is leaving reviews that have nothing to do with our jobs and careers outside of BP. He has hit three of us so far. I have contacted BP and reported him...

And yes, it's online, not in-person. 

We did find some lenders by searching online, but never actually got to that point in the deal.

I work with a handful of online lenders for my portfolio and they are all still up and running.