Builders ask for black money

Is it common practice for every builder to ask for black money as a portion of sale? I recently planned to buy a property. Quoted price was 1.9 cr for a 3 bhk in bangalore. Builder asks for 60 lakh black money. I have never seen black money nor do i have any. I told him this, and his reply was to transfer 5 lakhs each into 6 persons accounts, for which he will give me receipt and then another 30 lakhs cash. Now how do i draw 30 lakh cash? will the IT dept not enquire? I understand that someone who already has black money will be able to hand over cash of whatevcer sum the builder is asking for. How does a person who has no black money buy a property in such circumstances? Am i missing something here?