I was thinking it is proof of Financing but was not completely sure.

Step 1: buy Dave Lindahl's book "Multifamily Millions", Steve Berges "The Complete Guide to Buying and Selling Apartment Buildings". 

I think it's completely in affective.

Would love to get some schooling from you more experienced Pro's out there on the best completely legal and ethical way to structure this.

We did a complete rehab on a single family and it made sense to add central air.

I wouldn't have money for the rehab, but taking ownership of the house by the deadline was my priority because I'd then have time for the lender's process to complete and then refinance.

Talk to a local RE attorney, but generally simply paying the taxes will not give you title....by "redeeming" it goes back to owners of record, prior to the action.  

Is this something to completely avoid?

If I buy a property with a partner under a 50/50 LLC, can I setup a separate DBA to receive rent checks that are simply passed through 100% to the LLC (e.g., there's no fee for the property management service)?

Hi Darius, Yes, you could buy property B and then refinance the property to generate additional cash to complete the acquisition of Property A.