If you have popcorn ceilings they will need to be sealed as well with the Kilz.

Besides setting traps and poison he also sealed holes found along the baseboard and walls.

In RI I had this happen,  a  pest control company had to come out and seal the house.  

On the other hand, if there other units above yours, consider whether their windows are allowing water into the walls even if yours are sealed well on the outside.

@Ryan MurdockThat pretty much seals the deal for me.  

We got some of their quality interior paint for $84/5 gal, kind of like a price matching program.If you can do concrete slab, staining/sealing is THE cheapest route, period.  

-Negotiate the lease price so I could rent it to another tenant at a higher price for cash flow-Negotiate final sale price-When he finds suitable exchange property, we seal the deal -Negotiate a lease time frame - 12-24 months?

The weather seal on the door that was replaced after it rotted away?

This is part of the learning experience.As a former carpet cleaner if it is cat urinating forget about it and you will %99 of the time have to replace carpet, pad and possibly tack strip and base trim not too mention sealing cement floors etc.Dog urine can be easier to deal with depending on dog.

Quality means they cut a groove into the brick mortar and folded the flashing into the groove, with everything sealed up with silicone/roof sealant.