Because of the protections an LLC offers in this space, I'd simply say my non-expert opinion would be to spend a little extra to make a separate LLC for this new home, for the legal protections & to make your taxes less of a headache for you.

We always provide the applicant with a list of required qualifications: income/rent %, credit score, evictions, etc. 

If you provide us with some details we might be able to better help, what did the last one look like?

An additional benefit of a detailed engineering-based Cost Segregation Study is that it can increase potential insurance premium savings as well as provides support for the property tax appeals process.Additionally, it can help maximize renovations and improvements.A Cost Segregation study is an IRS approved federal income tax tool that increases near term cash flow by utilizing shorter recovery periods for depreciation to accelerate return on investment.

My father wants to use his SDIRA to provide a loan to the LLC him and I are equal partners in.The loan would provide the additional funds we require to purchase an investment property.The LLC would pay principle and interest at market rate to the SDIRA.Would this be considered a disqualified transaction? 

Newer brokerage policies in our mls have more clearly separated listing and buyer broker fees, so you can likely interview nearby buyer brokers who will provide the service for a set cost or possibly work with you to represent you on an agreed upon sales commission where if seller doesn’t offer to cover it, there’s a minimum you’ve agreed to pay to broker on any purchases that are realized through their service.

You said you bought from the turnkey provider.

Offer to pay the neighbors a reasonable amount say $50 - $100/mo. as they're doing you a GRAND favor helping you and besides that extra money may aide with commuting costs to work or a boost to their monthly budget or a their savings account!

Secondly, transparency is key—ensure the lender provides clear information about all fees and costs involved line by line.

Whatever has been provide to any w2 employee you will provide.