I'd guess Automation will be our next big hurtle.

Could also be old urine from the dead mice that has seeped into the flooring (especially plywood or concrete) or into the drywall.

Sweat and urine can both emit an ammonia smell.

Hey @Drew Zoller,I had a similar situation with pet urine in my current live-in flip. 

Also if you allow pets it's a no brainer to get rid of the carpet since the urine smell never goes away when it gets down into the padding, but with vinyl that's easy cleanup. 

Pet urine?

It will also pay enough to replace dog urine soaked carpet and particle board in a master bedroom of another house and there is change left over. 

Brought 3 dogs instead of 2, didn't pay pet deposit on move in, dogs peed in the back room (the flooring we have to replace), and they covered it with perfume, but if you get down at floor level to take pics of the swollen corners and edges from the pee, you're hit with dirty dog/urine smell. 

What do you recommend for cats that urine in closet and get behind the the trim/drywall? 

Just google eviction service near me.It is pretty normal for the new owner to deal with that; the only way I have been able to get around it is by making the EMD non-refundable, which gives the seller confidence you will close or at least let them keep the EMD for damages.In terms of the pet smell, order a 40yard dumpster and get everything out, next any good PM can hook you up with an enzyme spray treatment that will metabolize the pet urin.