They want someone who is physically local that can be responsible for issues that come up.If you are required to hire a property manager anyways, might as well just pay them to do the tenant placement.  

What I'm really looking for is a simple platform where my tenant can pay rent online rather than send in a physical check every month (their current system...).

It takes time to identify these properties  and often requires physical observation, not merely sitting behind a computer scanning through property listings, but they are out there.

They do not need to be physically located there. 

But are you saying to find a local bank branch and physically go in and develop a personal relationship with a banker? 

However, they are hard on the physical property. expectations before they move in matter most, if you share the clear rules about what is expected, and what isn't, and remind them that you are connected (even from a distance), I expect it could turn out well. make sure you aren't putting in high dollar nice things.

So, go with a good solution on the deadbolt.Screw a lockbox in a wall near the door for an emergency physical key.Find a locksmith that can rekey the doors between tenants - put ALL locks on the same key.Most electronic locks warn you when the battery is getting low.

If for some reason they can't get this sorted out by the next payment date, you should figure out how to physically escrow that payment somewhere...this at least protects your payment until you're confident who it is supposed to go to in the future. 

My goal is to attract standard medical office tenants who do not require specialized equipment—such as Primary Care Physicians, Urgent Care Clinics, Chiropractors, Physical Therapy & Rehabilitation Centers etc

I have a building on the outskirts of San Antonio, but it is considered San Antonio as far as a physical address.