So I'd say the seller(s) should consult with an attorney or accountant, but it's possible they may owe much less than 15% or nothing.Also as Account Closed said, seller financing is also often attractive to people who are concerned about taking a big tax hit in one year - instead it's "pay small amounts as you go, over time as you receive the money" and is great for a number of reasons (no or a favorable interest rate for you, no bank BS, build long-term relationships and credibility with future sellers, possibility to discount in future with a payoff offer, etc.).It's worth having in your mental toolbox even if you don't use it on this deal.

I came from a very financially poor childhood where nothing was ever handed to you, you had to work to get everything and I guess that I have never gotten away from that mentality.

They just have mentally moved on and are ready to close out the note because it's their last reminder of the property.

I suppose it is all that public education I got drilled with that keeps me holding onto a partial slave mentality. 

Remembering that you're not building your dream house is a mental block for many new investors. 

This is why don't referred to any of these assets as houses, I prefer to use the term asset because that's the kind of mentality that I want to keep while making my investments.

Data is I'd say 20%. 80% is going in with the mentality that you're gonna have it your way, come heck or high water.  

Someone that has some construction background and has more of a thrill seeker mentality might be really bored with stabilized B class multifamily deal acquisition process with a 10 year hold strategy.Someone that really cant handle the sleepless nights of 50% vacancy or better yet 100% vacancy really shouldn't be looking for to the stud rehabs of a 20 unit with a hard money loan that needs to be refinanced out in less than 18 months.Are you a data guy?  

Taking the time to expand your knowledge and get involved with different aspects of the real estate industry will pay off in the long run, just don't go into it with a short term mentality and you should be fine.

Apply that mentality to everything you do.