Hi Nathan,So quick question:  once you verify that tenants abandoned the property, and you posted the notice to front door (giving them x days to respond of course) and they still don't respond then you can regain possession of property and proceeding with whatever you need to do in order to list the house again? 

The proceeds from the sale will probably go toward rehabbing Lot 2 and sell it for more.

Maybe they think they will get bashed on here. 

The auction price seems to assume that the proceeds will be applied to repay the first mortgage and the second mortgage.

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You get a deduction for the contribution, the gains grow tax-free and as long as you use the proceeds for health-related expenses the funds come out tax free as well. 

I would also be a hard no; I don't subsidize other people's investments.The fence is shared by both of us, how should I proceed in this scenario?

As Peter and others have stated you need to get a few different opinions are the work needed, costs, etc before making a decision on how best to proceed 

I took no money from the cash flow (when there was any) and I never made a late payment to the bank.This fall, nearly 12 years after the bank gave me that house, and over 15 years after I knocked on that door - after evictions, vacancies, insurance claims, and never taking a dime out of it - I sold that house and placed all of the proceeds in a 1031 exchange.

And your net proceeds will be $450K ish (again, the closing costs are subtracted from your reinvestment target.In this case you would need to purchase at least $450K of real estate using all of the net proceeds of $450K.