First of all you should have filed ITR by July 2017.
Now you can't file ITR for 2017 and can't pay tax on same.
You can now pay tax on it only when the income tax department sends you notice of same.
Now whenever you receive the notice you will have to pay income tax along with interest and penalty.
We can avoid some interest by paying the tax but you won't be able to file return now.
Also there are chances that income tax might have sent you notices but you have misplaced it?
What's the registered value of your property since you are saying you have received some amount in cash.
I have surprised why have you not received any notice till now as you have undertaken a huge transaction and not filed any income tax return.
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Thank you
Thanks sir for your kind words you have not mentioned your email id otherwise I would have mailed you personally but sir I would surely love to know what piece of my suggestion made you feel that I am not giving you serious advice and I would also love to know what better advice you have received so that I can improve.
Thank you