Clarification on section 56-2(7) if it based on circle rate or d actual stamp duty

I have a small querry related with a property transaction one of our buyer is doing. He is buying a property(Original cost is 1.45Cr) at market value of 1.2Cr.Circle rate of this property is 80lakhs.As the property is getting transferred first in builder records n this buyer wud become owner first through endorsement n then builder wud get d conveyance deed done. builder is stating that the stamp duty wud b paid at 1.47Cr as that was d original cost on which all taxes have been paid.Buyer is getting apprehensive that he wud have to pay capital gain tax for 27lakhs as he is buying at lower rate than original cost of buying of previous owner. This is an actual genuine deal where nobody is trying to evade tax or stamp duty so pls let me know how can we satisfy this buyer here.I have told him that tax treatment is based on circle rates and this rule of tax implication under section 56-2 on buyer is based on circle rates for buying which is lower than state defined min stamp duty and not the actual stamp duty but being a chartered accountant himself,he is not ready to accept this view.