I'm currently renting the house month to month to a traveling nurse who's supposed to stay through November.A water mitigation crew came in and tore out some drywall and dried everything out and then a sister company then came out and gave me a quote.

California charges a minimum tax of $800 a year per LLC, and more if you have gross receipts in excess of $250k.

Complicated rooflines, modern details that require a bunch of steel framing, excessively large great rooms, spa-like bathrooms, etc would push you into the $1,000-2,000 range.  

All that is to say that if you did nothing and ran a slight deficit that didn't run you dry, over time, the probability htat you would be able to refinance the property into a lower rate that resulted in cash flow is high, along with the benefit of appreciation.2.

For walls I spray with one of the various neutralizers for pet urine on the walls. after dry,  follow up with a vinegar solution.

Do you prefer it over installing dry wall?

Remember, your tenants aren’t going to pay you more rent for a pretty basement so only do what you need to to keep them warm, safe, and dry.

My tenant of 1 year just moved out recently (work transfer), but during the move-out inspection we found that one of the 10X10 bedroom has all four side of the wall covered in screw holes from the time they used it as a computer room (I believe the holes were from the sound deadening foam that they used to attach to the wall) So I was wondering what would seem to be a fairly reasonable cost to be deducted from their Security Deposit for the excessive holes and needing to repaint.

They can recover the excess funds later.  

For both tenant and landlord peace of mind, the property had an extensive video surveillance and security DVR system already installed by the prior owner, which covers outdoor areas and indoor common areas and records 24/7/365, as well as sensors for excess dB noise levels.