Tenant paid me electronically using one of the major online services.

While the 1% rule is a great General guideline, what really applies in an area such as St Louis, which is predominantly a Class C or worse area for cash flowing rentals it's something known as churn.

They're a little more expensive than a standard lock, but way cheaper and faster than a locksmith.Note that these are not electronic locks (although they do offer electronic versions).

I have been managing "per cleaning visit" electronic payments to cleaning company for several AirBnB properties for a few months without issues. 

If the rental agreement so provides, the landlord and tenant may send notices in electronic form, however any tenant who so requests may elect to send and receive notices in paper form.

So...Electronic statementsQuarterly inspection reports (with pictures)Quick and reliable responses to my inquires. 

It's all electronic signing and via email.

They e-mailed a electronic copy of the Articles which was very basic and said that was it besides the LLC-12 within 90 days. 

Also I'm not looking for electronic or wifi connected, just a mechanical unit. 

No cell phones, no texts, no online portals and rent payments, no electronic signatures, some email, newspaper ads and a lot of door knocking (I can almost feel some of you more seasoned PM vets nodding out there).