Hi,
I did not understand the question clearly but let me tell you the answer for the parts which I have understood:
1. Yes, buyer will need to deduct 1% TDS if sale consideration is more than 50 lacs.
2. Capital gain to seller will depend upon the following factors:
A. Purchase price
B. Selling Price
C. Stamp duty value
D. Date of acquisition
E. Date of sale
F. Amount and date of improvement if any.