Don't go for low hanging fruit. 

If you ever get sued, and a contingency based attorney looks at your property, and doesn't see a note attached, that is a low hanging, ripe fruit.

I have my own machines in another similar building, and the collections are usually very consistent month to month. 

I have 2 ground partners this year that quit there day jobs BECAUSE they do all the WORK and risked their time... both on track to make 100s of thousands this year.. and I will make 100's of thousands from the fruits of their labor... or they could just keep working were they were working and doing a deal a year or so...

I'm not going there because it too would be a complete waste of time and money, but if you are really wanting to "catch a bad guy", that might be a more fruitful route.

Run an ozone machine between tenants and then let it clear out for a day before showings.

-The niche, boutique brokerage is a great target because they are generally slammed with more business than they know what to do with, they generally are still using fax machines and rotary dialers, (i'm only half joking I still see @aol emails all over costar to this day) so it leaves ample opportunity with anyone that can use an crm a chance to add real value and grow the business in a measurable way.- These tend to be "assassin" type shops who are small teams of pretty elite operators, and they aren't bloated down with BS like the big CRBE's etc of the world, so you'll get exposed to more, you'll get exposed sooner, and they will generally be ideally with a niche industry or product type but will often have a ton of satellite deals they get which will get you cross industry exposure. 

At the same time, it is ok to enjoy the fruits of your labor and relax too!

Table, chairs, margarita machines, tents, moving dollies, and more.

Definitely learned on the back end that it was just a an up-sell machine.