Good advice from all the posters here, but @Ray Harrell is spot on. 

Thank you, Ray Harrell. 

We use our own inhouse software, that way we can get custom requirements faster and we can provide support without headbanging with vendors.Originally posted by @Ray A Delfi:@Leon Kanon what systems do you use?

Hey @Ray Johnson thanks for your response!

Originally posted by @Ray Harrell:@Marc Winter, maybe in your country you can change locks on an occupied unit.

@Ray Harrell -1.

., @Robert Larue, @Dre Scott, @Annie Smith, @Steve Sherman, @Astrid Dymond, @Zach Stillman, @Paul Vogt, @Naveen C Reddy, @Brent Murphy, @Joe Wenger, @Lance Ray, @John Krauklis, @Clayton Evans ... please tag those who I've missed.

^Ray nailed it 

Ray's advice of having your tenant sign a pre-dated move-out notice and then changing the locks could result in an expensive lawsuit as an illegal self-help eviction.

Originally posted by @Ray Johnson:@Alex Price First you must recognize that at the level you're discussing, the business models will be using a cashflow range because they are using IRR scenarios and not the simple calculators found on BP.