Ever had an awful roach infestation from bad tenants??

When I was a tenant and college student, I was able to remediate an inherited bedbug infestation on my own with no professional help.

No need for an exterminator unless you have an infestation.  

What are the best options to rid the house of the small black ants (regular ones) infesting the property?

Could we require our tenants to maintain and pay for this treatment in order to avoid any further pest infestations?

@Kevin Thomas You definitely want to nip this in the bud as rodents tend to multiply and their feces can cause health issues if it becomes an infestation.  

On it you should have things like:House keepingWindow glassRodentsPlumbing/WaterCarpetSmoke Detectors (Change the batteries too)DrainsToiletsYou are trying to do a few things:Document/correct on going damageFind immediate issues that need addressed (water leaks, broken glass, infestations, house keeping issues etc) so you can issue lease violations or perform maintenance.  

Where I live, it's not a matter of if you'll get termites, it's just a matter of when.Personally, I spend $400 a year on termite treatments for my personal residence, but on my investment properties I don't pay for prevention, only treatment.My termite contractors generally charge about $700 to treat an infected house, so it's more cost effective to remediate a problem than try to prevent it, given the likelihood of a termite infestation in any given year.

This includes 3 bed bug infestations, 7 gas red tags, a broken window from hell that the first 4 window contractors would not touch and the pane replacement was almost $1k (this window is unique with an absurd fire rating).  

Bed bug infestations can be challenging, but heat treatment is an effective method.