The above issues are extremely common with all properties I buy, but what I buy are pre-existing multifamily with some meat on the bone. 

REALTORS® shall recommend that sellers/landlords obtain the advice of legal counsel prior to acceptance of a subsequent offer except where the acceptance is contingent on the termination of the pre-existing purchase contract or lease.

So I disagree with your assertion that pre-existing lienholders (e.g., the owner of a tax lien from 2014 in your example of a 2017 tax sale) can sell the property on the courthouse steps after a tax deed has been sold.I am not a lawyer, and this is not advice.

Not saying you should, check first of course.Depends heavily on the AHJ where you're located and whether or not you have a pre-existing relationship with them.

It might just be a mute point. if you had a pre existing relationship with a buyer it should take care of itself. 

It is a pre-existing multi-family building in a commercial(C-3 Zone).

Hello I hear their are unsecured loans I can acquire via my income history I believe they give you an income of 20% of the loan now can I pay into the debt replacing pre existing gray space the remaining 80% or will it remain outside as a new amount, hopefully that's understandable.also if I earn $30,000  annually what amount do they let me receive, thanks appreciate entirely.

It was an important lesson I learned a few years ago and now treat all working relationships differently, regardless of whether the relationship pre-existed any business dealings.

Since it doesn't sound like you have a pre-existing relationship with a builder I'd spend a LOT of time checking references and their other projects prior to picking a team.

Im sure your dad has some solid pre-existing relationships as well no?