What are other DTI factors should I look out when purchasing to satisfy lenders approval?

We will apply for the loan jointly as individuals and not with an LLC or formal partnership.OR would it be better if I put all the down payment and limit the partnership to using his income for the loan approval?

Ive applied to multiple credit cards but haven’t gotten pre-approved on any yet.

Many roofing materials come with warranty if purchased and installed by approved contractor.

I am just starting out with rental property investing and trying to figure out how to buy that first property.  Currently, I am focusing on small multifamily and trying to figure out how to finance it. I own the house...

What are the steps to be taken when a tennant in Tn has violated NEC codes via overloading circuits an daisy chaining strip outlets,permanently using extention cords off a strip,etc in a very unsafe way.Can you evict them for adding them without your permission when lease states it must be approved 1st.? 

I am already pre approved for a loan, and am looking for a property to complete a successful BRRRR.

they may give you conditional approval. 

Hopefully a tax person can answer for sure, but I don't see a problem with it as long as your partners approve.

I then recommend doing a cash out refi on the new investment property on the refinance portion of BRRR to pay off the HELOC which would allow you to draw against the HELOC again during the repeat portion of BRRR while once again avoiding closing costs.If you do a cash out refi of your primary to fund the purchase and rehab, you likely will have a large amount of closing costs, and since it could take a month or more to be approved, you likely wouldn't be able to take out the exact amount needed which means you will be paying extra closing costs and additional monthly interest charge that could have been avoided with a HELOC.