Keyscan, DMP, Alarm.com, Honeywell, Brivo, and others all have commercial door access system based on keyfob solutions. 

My first rental was a townhouse house I lived in for many years, and I was the first owner, so I knew all the ins and outs about the house and the HOA maintained the exterior of the townhouse (paint, gutters, etc.). all the common areas and trees.

I'm in process of building a solution to help owners find property managers.

Nobody is going to tell you if some tree limbs fell and are in the yard. 

@Delicia M.Here is another solution.

@Thomas Hallowes, A partnership like @Derek Carroll mentioned might be an attractive solution. 

I wont forget how amazed one of the agents who was showing me around Atlanta was when I introduced him to Waze a few years ago, which forecast  a stopped car around the bend - and sure enough there it was :)I land up needing to call my US bank on a landline more often than I ever need to call my Iocal bank - (in fact come to think of it I never call my local bank) The solution is to find a cell package that includes foreign calls in the base price- and then you don't think twice when you need to call or for how long.

The answer really depends on your state and local laws and varies from place to place.Rather than worry about two deposits, an easier way (if you can do it) is simply collect a larger security deposit and make sure your lease includes unpaid water bills as something that can be deducted.The best solution is to have a great property and find great tenants who pay their bills.

I'm looking into a property mgmt software as a long-term solution, but its good to know I can sync up all my calendars for free in the meantime.

It could be they are just unreasonable and will not go for any reason which the legal process just has to work itself out OR it could be a reason for which there is a solution to solve the problem.The question then becomes do you the owner of the property want to pursue that possible solution or or do you want to use the legal system?