Claim ALL of the income.
Deduct every little item you can find-even insurance, gas, you name it. You were holding it and showing it for 35 years to build its market value.
Then if you get audited, you will have properly shown declared income, and if they have a problem with a certain line item of deduction, so be it - that's not fraud, that's tax avoidance, which
AFAIK is still perfectly legal.