An estoppel certificate is a form you have the tenant sign that confirms their lease start date, the amount of their security deposit, and other things.

I have prospective tenants who signed a lease on 31st of October and paid security deposit same day.

This needs to be highlighted in the lease and acknowledged by them.Security Deposits: You can’t use their security deposit for routine cleaning, but if they leave things in bad shape beyond normal wear and tear, it’s fair game to deduct cleaning costs.I’d start by having a straightforward talk with them about the importance of keeping things clean for health reasons and property preservation.

By sb1482 there cannot be a substantial change in lease terms but requiring notice to introduce animals, requiring keeping public/common areas free of junk, requiring her animal to be leashed in public/common areas, to require instant pet pick up in public/common areas are all reasonable terms, require the animal to not be a nuisance to other tenants (jumping on definitely is a nuisance, but I usually mean this to mean the dog cannot have excessive barking) and would be difficult for tenant to state are substantial change of terms as all those are reasonable requirements. 

The whole idea of a quiet title is to give people public notice, you never really know if they are local or not.

Consider a cash-out refinance or a small business loan to fund these repairs and secure the property long-term.

There was a concept query of public (2021?)

If it is a legit ESA, it still has to abide by the usual criteria (no barking, biting, and/or destruction, picked up after (we have daily requirement for private yards, immediately for shared/public areas)Good luck.  

Consider remote monitoring tools (like security cameras), and budget an extra 10-15% for surprises.

If you are going to go with secured mailboxes you will need to contact your local postal office and tell them you have two new boxes that you will need to get "Arrow" locks installed on.