And in those neighborhoods, you may be the first tear down, never a great position to be in if resale is part of the plan, I do some work with Habitat for Humanity and we have been able to get some lots for under $200,000 but these are not lots that would support a new luxury build. 

You can find market rents at www.rentometer.comti support your spreadsheet.

Does your DTI support this kind of loan?  

However; I don't think I was, as my flyer was solely to agents not consumers, therefore; I don't think the same rules apply.

The comps are out there to support coming close to the ARV that you are advertising if you look at just the lot size and square foot of the home, but all of those homes are superior in that they're newer construction with end-buyer-desired floor plans, have barns or extra garages, and some are even water front.  

Develop a strong USP helping agents/consumers with their biggest pains on listings, then...Become a PRO member here and put it in your signature! 

There are governmental liens that are not extinguished via the tax sale; IRS, city mowing, child support, etc.

In our state (NC) the “standard” Offer To Purchase and Contract form (NC Bar 2-T) supports seller financing via line 1(d) entitled BY SELLER FINANCING and the accompanying Loan Assumption Addendum Note though that virtually no NC brokers will entertain a lease with option to purchase deal because the old “standard” form for this kind of transaction is no longer available from the NC Bar, NC REC, or NCAR.

Remember Paint is just colored glue.You can scarify the concrete to remove as much as you can and then encapsulate the  concrete with a portland based self leveler ; Ardex, Mapei are a couple of national well recommended brands with good tech support.

There is a wealth of information and support available throughout the site.