The new law makes it binding on the purchaser to deduct tax and deposit in the builders PAN account. The details of the article are available here:
" Further to my discussions over phone few minutes back I wish to draw your attention to the news regarding:
"deduction of 1% TDS and pay 99% of installment to the builder.
It looks as though that is not only our responsibility to pay government the 1% TDS, but also to provide the builder the payment info (challan number/BSR code of the branch/date of payment/amount etc) to the builder for their smooth tax-filing".
Accordingly you are requested for the following:
1. Their PAN Account details
2. Amount that has to be deposited as TDS