Many hours and costs to mitigate for urine in basement concrete floor.

The deferred maintenance was significant- 3/4 of the roof needed replaced, the hallways were incredibly dirty, 3 vacant units that needed complete rehab, residents had anything from holes in their ceiling to faucets shut off because they were leaking so badly, landscaping overgrown and/or dead, and the entire building smelled like cigarettes and urine.

The roof was leaking, the entire building smelled like cigarettes and urine, residents' maintenance requests were ignored, 3 units were vacant, and residents weren't always paying rent.

It could have a pet urine odor, mold or musty smell. 

We used Killz to paint the floor under the carpet after a tenant snuck a dog in that urinated everywhere and it seemed to help.

While we do have in our contract that 1 pet under 25 lbs is allowed, we are concerned about cats on our property, as when they urinate in hidden corners, it may not be visible right away but could stink up the house later, requiring extensive restorations. 

The urine is the killer.

@Niko RossleyOne of your biggest hurtles will be getting financing.

Tenant, your cat urinating all over the basement and the basement drywall does not mean the smell is only contained to the one room that your cat decided to mark). 

It sounds cumbersome but if that's what it takes.The first fine we received was because a tenant had ripped out her living room carpet (her child urinated on it), dumped it on the sidewalk (without an type of communication to us) and required we change it which we had agreed to prior not including the rip it yourself part.