We went with traditional stick frame with spray foam insulation and extra wall  insulation.

Ask her to buy some Ozium and spray it when she’s smoking.

If the litter box is not kept meticulously clean, the cat will urinate elsewhere, Carpet has to be ripped out, the pad removed, the sub floor deodorized and sealed and new carpet installed.If a cat sprays on a wall, the baseboard and wall board must be removed and replaced with new.Cats spray urine outside the house and it stinks.

If the tenant is real good I would allow it being it is sprayed and neutered.

All the SIP panels and metal roofing had to be replaced at a cost of approximately $45,000.2) To reduce moisture entering roof panels, use the spray foam the panel provider provides with the SIP package BUT ALSO use permanently flexible tape to cover any joints between panels.3) Make sure there is an adequate drainage plane behind the siding.

For an apartment turn, I like to do a complete wash down of all surfaces, with a water & vinegar spray (deodorizes as well as cleans).

If you are tight on a budget god pick up the old bandit signs laying in the ditch, clean them off and paint them for $0.97 Walmart spray paint.  

Search, "monkeys sprayed with water."

Materials (80 baffles, staples, tape, caulking/spray foam to attach and air seal the baffles) should be no more than $250.  

It is like a pressure jet that sprays in a cone inside the drain line.