We've found it has superior reporting features, integration features, and is overall more efficient to work within than other REI-specific software.The downside is QBO is not set up for REI so you'll need to do that or work with an expert to ensure it is set up for your business appropriately.Something else to keep in mind is your entity structure and how your entities file tax returns.

Let's break it down into two pieces, the LLC and the partnershipThe LLCYour current operating agreement should lay out ownership structures and contribution.  

Any tips on structuring deals or ensuring a smooth process would be greatly appreciated?

Sounds like there might be some more facts of the entity structures since you imply a k-1 will be involved but only reference ownership of property A.

Does the lending support borrowing under a company or trust structure for tax benefits?

@Jack Lee is is great to know how to structure the deal, another is to find the property and make sure you are not missing the issues you will run into with an older house. 

Since my business is structured as an LLC the taxes have them all reported together as LLCs are a pass through tax structure.  

They can only provide a general liability-only policy through Lloyd's, which doesn't cover the physical structure or contents.If anyone knows of a good insurance provider that offers comprehensive coverage, including protection for the structure itself, I would greatly appreciate your recommendations.

I happen to agree with most of the folks on this board that this kind of structure is overkill.Also, understand there can be issues getting a mortgage with an institutional lender and potential problems getting title insurance.

The vast majority of DSCR loans are structured as regular mortgages with the personal income/DTI replaced by the rental income from the property.