We just went through renovating a cigarette smoker cat spray house (an inherited tenant) and after 3 full scrubbings with TSP, soaking slab and subfloors in vinegar several times over several weeks, then painting subfloors with Kilz, duct cleaning, etc., it finally seems to be resolved.  

I don't feel comfortable with 64 oz of vinegar hanging from it.

As a cat owner I can testify that this actually has worked better than pet store solutions in our house:First mix vinegar and water 50/50 and soak the areaWhen almost dry soak the area with a mix of 1 cup hydrogen peroxide (3%) mixed with 1 teaspoon of dish soap.

We prepare a move-in gift package that includes cleaning supplies (degreaser, carpet spot cleaner, vinegar, baking soda, magic eraser, disinfectant wipes), cutting board, plunger, hand soap, dish soap, paper towels, and toilet paper, presented in a cleaning bucket and reusable shopping bag. ($30)  At move-in we also loan the tenant the use of drop cloth runners (to protect the flooring on move-in day), furniture moving blankets, furniture sliders, furniture lifting straps, a step stool, and a picture hanging tool kit (with small hammer and picture hooks). 

Then use a clean product or method targeted for that type of odor.We clean all hard surfaces with a cleanser/degreaser, then a vinegar wash, and finish off with a disinfectant. 

Cost is $100 for a recirc pump, 5 gallon bucket, a set of washing machine water hoses and a few gallons of white vinegar. 

@Nathan Barshinger you need to walk before you runSEPA is a good market the fact you want to go out of state when you’re sitting on gold is concerningYou need to start running numbers daily until you understand what youre looking at I’m sure myself or some of the others who invest in York would be willing to partner on a property once you show you’ve done some learning and aren’t all piss and vinegar

Tenant may be able to keep drains clean and clear withregular maintenance by pouring down the drain a quarter cup of baking sodafollowed by a half cup of vinegar. 

If the levels legally require remediation you will pay for the testing and if they do not the bill will go to the tenant.You can also take the alternate approach of going into the attic with bleach or a solution of distilled vinegar and scrubbing the area that the tenant reported had mold.

It is a legitimate allergy, but you may be able to have the carpet cleaned using white vinegar in the shampooer or another additive that will neutralize the cat saliva and dander.