People here are taking common sense precautions.

But given the data posted above, I realize it's something I may need to consider when I have MFHs and want to keep a large pool of potential renters to choose from.It's good to hear that so many property owners have not found allowing pets to be a serious drawback when taking appropriate precautions.

The initial contract was set up by a poor property manager and then I fired him and took over.Are there any legal precautions if I tell him no?

Our maintenance tech was following all precautions, he had fans going, and the doors and windows were open for ventilation.

You're in California where the odds are higher that your landlord may be seeking a "jumbo" loan.Back to your specific situation: You need to know more about your landlord's requested loan and lender than they may want to share to know if any options exist... but your landlord may not be aware of or have asked about alternatives.If there's no way around an interior appraisal, I'd suggest asking to talk to the appraiser ahead of time and see what precautions they're taking.

They all have security cameras, nicer locks on their entrances, but nothing else as an extra precaution.

All it takes is one innocent nail into a stud wall improperly laced with piping or wiring across it to ruin the safety of the house and the people living within it.Find a seller who realizes they shouldn't do everything on their own or stand firm on a price that will allow you to take the necessary precautions to safeguard the home and your investment after escrow closes.

To many precautions are built in to prevent it.  

Stoves and basements don’t mix very well without proper ventilation and fire precautions.

I guess all we can do now is to take extra precautions.