The paper says "No person shall occupy this house until a certificate of occupancy is issued."

When an investor surrenders a tax certificate for a tax deed through the probate office does that change how the former owner redeems the property?

I attended the FHA home owners education class and received the certificate of completion, so I am working with the lender on the 3.5% down and down payment assistance, so I have less money out of pocket and can focus more of my funds on renovation and increasing equity.The properties I am looking at either have basements that are finished, or basements that I can finish myself to rent out separately either on a month to month basis, or as an AirBnB, or they have detached garages that are big enough to convert to a studio, or AirBnB. 

Tenant shall provide a certificate of insurance to Landlord demonstrating that Tenant has procured the required insurance coverage, within ten (10) days after the commencement of the Term of this Lease and within ten (10) days after any renewal or change in such insurance coverage.

Estopel Certificate or at least a questionnaire for the tenants. 

There are a lot of good training certifications for dogs out there now that could potentially help in easing concerns about a dog's destruction level.

My MLS does a bunch for free.Any other certifications you get may have an annual membership cost.Marketing material, signs & lockboxes get pricey. 

Flood insurance is property-specific depending on the flood zone the property is in and the property's elevation as determined by a surveyor on an elevation certificate.

Currently the title company is doing the tax certificate process and he owes $5300 to be exact, Is it possible or likely to instead lower my offer to $2000 and settle the taxes with the city?

@Matt Gregory - A cash out refi  at 80% LTV requires a 1 year owner occupant certification, so you can't do that if you are planing on making it a rental unit.