Lol.You can use a product like Fiberlock LBC (lead barrier compound) and seal off lead containing paint as long as you're following RRP guidelines.

Fill the cavity with insulation (like Roxul Safe and Sound and be diligent about sealing any penetrations around electrical boxes with sound-deadening putty.

Seal few cracks in the patio around the chimney base on the ground and a small crack on the foundation wall to prevent water to get into 6.

However, if pet urine has saturated the subfloor, 100% of the cleaning/sealing cost can be billed back.

Additionally, there are a number of areas that require re-sealing (at chimney and vent boot in rear, and at unused plumbing vent that dumps into ceiling below).

It’s just setting traps (and disposing of the “catch”) and more importantly, find the places they are getting in and seal them up. 

Install new grout and seal.

Not sure how far you are from Chicago but whoever quoted you that must be from a company like Perma seal.

I am surprised though that they were let go and the Seals maintained their position.....

If the urine is in an upstairs floor, you have to be certain that the smell isn't coming through the floor into the downstairs.Other than that, if it is dog urine or human urine, a really good coat of any paint should seal the smell in.