Closing is also set for Nov 15th and I just need a Certificate of occupancy to close the house.

I indirectly work with the assessor's office to obtain our tax certificates and reassessment values before filing maps for subdivisions, so I do have some specific contacts at the tax collector's office if you wanted some help on this.

I purchased a few tax certificates at the Jefferson County auction back in July.

What about when people get ESA certificates for their restricted breeds?

Be careful, there are a lot of people buying these certificates on the internet and they show you a fake piece of paper in hopes you allow the pet without add rent or deposit even if you have a no-pet restriction. 

I'd probably give them a gift card or certificate for their patience, cooperation and understanding.  

The notice to the landlord must be accompanied by either a copy of theofficial military orders showing the servicemember was on active duty or awritten verification signed by the servicemember's commanding officer and acopy of the servicemember's death certificate.( 4) Upon termination of a rental agreement under this section, the tenant is liablefor the rent due under the rental agreement prorated to the effective date of thetermination payable at such time as would have otherwise been required by theterms of the rental agreement.

I just got my Real Estate license and I want to do property management for an investor who is a friend of mine in Texas.Right now he has a few properties but he and other investors are planning to buy a lot more.Do you think I need a certificate?

As a seller u only want to deal with those that have their certificates in hand

Some tenants may moveout when they stop receiving the special treatment from the old landlord they are used to receiving but as @Peter MacKercher said, if your plan is to come in and make some nice repairs, then this would be an eventful situation for everyone.One thing with an old landlord running the business in a lax manner is that there could be a lot of ambiguity and false assumptions in the lease terms so with that I would make sure to get a estoppel certificate.